Several vulnerabilities have been discovered in the Linux kernel that may lead to the execution of arbitrary code, privilege escalation, denial of service, or information leaks.

This update is not yet available for the armel (ARM EABI soft-float) architecture.

CVE-2020-24586, CVE-2020-24587, CVE-2020-26147

Mathy Vanhoef discovered that many Wi-Fi implementations, including Linux's mac80211, did not correctly implement reassembly of fragmented packets. In some circumstances, an attacker within range of a network could exploit these flaws to forge arbitrary packets and/or to access sensitive data on that network.

CVE-2020-24588

Mathy Vanhoef discovered that most Wi-Fi implementations, including Linux's mac80211, did not authenticate the 'is aggregated' packet header flag. An attacker within range of a network could exploit this to forge arbitrary packets on that network.

CVE-2020-25670, CVE-2020-25671, CVE-2021-23134

kiyin (&#x5C39;&#x4EAE;) of TenCent discovered several reference counting bugs in the NFC LLCP implementation which could lead to use-after-free. A local user could exploit these for denial of service (crash or memory corruption) or possibly for privilege escalation.

Nadav Markus and Or Cohen of Palo Alto Networks discovered that the original fixes for these introduced a new bug that could result in use-after-free and double-free. This has also been fixed.

CVE-2020-25672

kiyin (&#x5C39;&#x4EAE;) of TenCent discovered a memory leak in the NFC LLCP implementation. A local user could exploit this for denial of service (memory exhaustion).

CVE-2020-26139

Mathy Vanhoef discovered that a bug in some Wi-Fi implementations, including Linux's mac80211. When operating in AP mode, they would forward EAPOL frames from one client to another while the sender was not yet authenticated. An attacker within range of a network could use this for denial of service or as an aid to exploiting other vulnerabilities.

CVE-2020-26558, CVE-2021-0129

Researchers at ANSSI discovered vulnerabilities in the Bluetooth Passkey authentication method, and in Linux's implementation of it. An attacker within range of two Bluetooth devices while they pair using Passkey authentication could exploit this to obtain the shared secret (Passkey) and then impersonate either of the devices to each other.

CVE-2020-29374

Jann Horn of Google reported a flaw in Linux's virtual memory management. A parent and child process initially share all their memory, but when either writes to a shared page, the page is duplicated and unshared (copy-on-write). However, in case an operation such as vmsplice() required the kernel to take an additional reference to a shared page, and a copy-on-write occurs during this operation, the kernel might have accessed the wrong process's memory. For some programs, this could lead to an information leak or data corruption.

CVE-2020-36322, CVE-2021-28950

The syzbot tool found that the FUSE (filesystem-in-user-space) implementation did not correctly handle a FUSE server returning invalid attributes for a file. A local user permitted to run a FUSE server could use this to cause a denial of service (crash).

The original fix for this introduced a different potential denial of service (infinite loop in kernel space), which has also been fixed.

CVE-2021-3428

Wolfgang Frisch reported a potential integer overflow in the ext4 filesystem driver. A user permitted to mount arbitrary filesystem images could use this to cause a denial of service (crash).

CVE-2021-3483

&#x9A6C;&#x54F2;&#x5B87; (Zheyu Ma) reported a bug in the 'nosy' driver for TI PCILynx FireWire controllers, which could lead to list corruption and a use-after-free. On a system that uses this driver, local users granted access to /dev/nosy could exploit this to cause a denial of service (crash or memory corruption) or possibly for privilege escalation.

CVE-2021-3564, CVE-2021-3573, CVE-2021-32399

The BlockSec team discovered several race conditions in the Bluetooth subsystem that could lead to a use-after-free or double-free. A local user could exploit these to caue a denial of service (crash or memory corruption) or possibly for privilege escalation.

CVE-2021-3587

Active Defense Lab of Venustech discovered a potential NULL pointer dereference in the NFC LLCP implementation. A local user could use this to cause a denial of service (crash).

CVE-2021-20292

It was discovered that the TTM buffer allocation API used by GPU drivers did not handle allocation failures in the way that most drivers expected, resulting in a double-free on failure. A local user on a system using one of these drivers could possibly exploit this to cause a denial of service (crash or memory corruption) or for privilege escalation. The API has been changed to match driver expectations.

CVE-2021-23133

Or Cohen of Palo Alto Networks discovered a race condition in the SCTP implementation, which can lead to list corruption. A local user could exploit this to cause a denial of service (crash or memory corruption) or possibly for privilege escalation.

CVE-2021-28660

It was discovered that the rtl8188eu WiFi driver did not correctly limit the length of SSIDs copied into scan results. An attacker within WiFi range could use this to cause a denial of service (crash or memory corruption) or possibly to execute code on a vulnerable system.

CVE-2021-28688 (XSA-371)

It was discovered that the original fix for CVE-2021-26930 (XSA-365) introduced a potential resource leak. A malicious guest could presumably exploit this to cause a denial of service (resource exhaustion) within the host.

CVE-2021-28964

Zygo Blaxell reported a race condition in the Btrfs driver which can lead to an assertion failure. On systems using Btrfs, a local user could exploit this to cause a denial of service (crash).

CVE-2021-28971

Vince Weaver reported a bug in the performance event handler for Intel PEBS. A workaround for a hardware bug on Intel CPUs codenamed 'Haswell' and earlier could lead to a NULL pointer dereference. On systems with the affected CPUs, if users are permitted to access performance events, a local user may exploit this to cause a denial of service (crash).

By default, unprivileged users do not have access to performance events, which mitigates this issue. This is controlled by the kernel.perf_event_paranoid sysctl.

CVE-2021-29154

It was discovered that the Extended BPF (eBPF) JIT compiler for x86_64 generated incorrect branch instructions in some cases. On systems where eBPF JIT is enabled, users could exploit this to execute arbitrary code in the kernel.

By default, eBPF JIT is disabled, mitigating this issue.
This is controlled by the net.core.bpf_jit_enable sysctl.

CVE-2021-29265

The syzbot tool found a race condition in the USB/IP host (server) implementation which can lead to a NULL pointer dereference. On a system acting as a USB/IP host, a client can exploit this to cause a denial of service (crash).

CVE-2021-29647

The syzbot tool found an information leak in the Qualcomm IPC Router (qrtr) implementation.

This protocol is not enabled in Debian's official kernel configurations.

CVE-2021-29650

It was discovered that a data race in the netfilter subsystem could lead to a NULL pointer dereference during replacement of a table. A local user with CAP_NET_ADMIN capability in any user namespace could use this to cause a denial of service (crash).

By default, unprivileged users cannot create user namespaces, which mitigates this issue. This is controlled by the kernel.unprivileged_userns_clone sysctl.

CVE-2021-30002

Arnd Bergmann and the syzbot tool found a memory leak in the Video4Linux (v4l) subsystem. A local user permitted to access video devices (by default, any member of the 'video' group) could exploit this to cause a denial of service (memory exhaustion).

CVE-2021-31916

Dan Carpenter reported incorrect parameter validation in the device-mapper (dm) subsystem, which could lead to a heap buffer overrun. However, only users with CAP_SYS_ADMIN capability (i.e.
root-equivalent) could trigger this bug, so it did not have any security impact in this kernel version.

CVE-2021-33034

The syzbot tool found a bug in the Bluetooth subsystem that could lead to a use-after-free. A local user could use this to cause a denial of service (crash or memory corruption) or possibly for privilege escalation.

For Debian 9 stretch, these problems have been fixed in version 4.9.272-1. This update additionally includes many more bug fixes from stable updates 4.9.259-4.9.272 inclusive.

We recommend that you upgrade your linux packages.

For the detailed security status of linux please refer to its security tracker page at: https://security-tracker.debian.org/tracker/linux

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote SUSE Linux SLES15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:2208-1 advisory.

  - The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent     Privacy (WEP) doesn't require that received fragments be cleared from memory after (re)connecting to a     network. Under the right circumstances, when another device sends fragmented frames encrypted using WEP,     CCMP, or GCMP, this can be abused to inject arbitrary network packets and/or exfiltrate user data.
    (CVE-2020-24586)

  - The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent     Privacy (WEP) doesn't require that all fragments of a frame are encrypted under the same key. An adversary     can abuse this to decrypt selected fragments when another device sends fragmented frames and the WEP,     CCMP, or GCMP encryption key is periodically renewed. (CVE-2020-24587)

  - The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent     Privacy (WEP) doesn't require that the A-MSDU flag in the plaintext QoS header field is authenticated.
    Against devices that support receiving non-SSP A-MSDU frames (which is mandatory as part of 802.11n), an     adversary can abuse this to inject arbitrary network packets. (CVE-2020-24588)

  - An issue was discovered in the kernel in NetBSD 7.1. An Access Point (AP) forwards EAPOL frames to other     clients even though the sender has not yet successfully authenticated to the AP. This might be abused in     projected Wi-Fi networks to launch denial-of-service attacks against connected clients and makes it easier     to exploit other vulnerabilities in connected clients. (CVE-2020-26139)

  - An issue was discovered in the ALFA Windows 10 driver 6.1316.1209 for AWUS036H. The Wi-Fi implementation     does not verify the Message Integrity Check (authenticity) of fragmented TKIP frames. An adversary can     abuse this to inject and possibly decrypt packets in WPA or WPA2 networks that support the TKIP data-     confidentiality protocol. (CVE-2020-26141)

  - An issue was discovered on Samsung Galaxy S3 i9305 4.4.4 devices. The WEP, WPA, WPA2, and WPA3     implementations accept second (or subsequent) broadcast fragments even when sent in plaintext and process     them as full unfragmented frames. An adversary can abuse this to inject arbitrary network packets     independent of the network configuration. (CVE-2020-26145)

  - An issue was discovered in the Linux kernel 5.8.9. The WEP, WPA, WPA2, and WPA3 implementations reassemble     fragments even though some of them were sent in plaintext. This vulnerability can be abused to inject     packets and/or exfiltrate selected fragments when another device sends fragmented frames and the WEP,     CCMP, or GCMP data-confidentiality protocol is used. (CVE-2020-26147)

  - Use After Free vulnerability in nfc sockets in the Linux Kernel before 5.12.4 allows local attackers to     elevate their privileges. In typical configurations, the issue can only be triggered by a privileged local     user with the CAP_NET_RAW capability. (CVE-2021-23134)

  - net/bluetooth/hci_request.c in the Linux kernel through 5.12.2 has a race condition for removal of the HCI     controller. (CVE-2021-32399)

  - In the Linux kernel before 5.12.4, net/bluetooth/hci_event.c has a use-after-free when destroying an     hci_chan, aka CID-5c4c8c954409. This leads to writing an arbitrary value. (CVE-2021-33034)

  - kernel/bpf/verifier.c in the Linux kernel through 5.12.7 enforces incorrect limits for pointer arithmetic     operations, aka CID-bb01a1bba579. This can be abused to perform out-of-bounds reads and writes in kernel     memory, leading to local privilege escalation to root. In particular, there is a corner case where the off     reg causes a masking direction change, which then results in an incorrect final aux->alu_limit.
    (CVE-2021-33200)

  - The io_uring subsystem in the Linux kernel allowed the MAX_RW_COUNT limit to be bypassed in the     PROVIDE_BUFFERS operation, which led to negative values being usedin mem_rw when reading /proc/<PID>/mem.
    This could be used to create a heap overflow leading to arbitrary code execution in the kernel. It was     addressed via commit d1f82808877b (io_uring: truncate lengths larger than MAX_RW_COUNT on provide     buffers) (v5.13-rc1) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. It was     introduced in ddf0322db79c (io_uring: add IORING_OP_PROVIDE_BUFFERS) (v5.7-rc1). (CVE-2021-3491)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SUSE15 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2021:0947-1 advisory.

  - The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent     Privacy (WEP) doesn't require that received fragments be cleared from memory after (re)connecting to a     network. Under the right circumstances, when another device sends fragmented frames encrypted using WEP,     CCMP, or GCMP, this can be abused to inject arbitrary network packets and/or exfiltrate user data.
    (CVE-2020-24586)

  - The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent     Privacy (WEP) doesn't require that all fragments of a frame are encrypted under the same key. An adversary     can abuse this to decrypt selected fragments when another device sends fragmented frames and the WEP,     CCMP, or GCMP encryption key is periodically renewed. (CVE-2020-24587)

  - The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent     Privacy (WEP) doesn't require that the A-MSDU flag in the plaintext QoS header field is authenticated.
    Against devices that support receiving non-SSP A-MSDU frames (which is mandatory as part of 802.11n), an     adversary can abuse this to inject arbitrary network packets. (CVE-2020-24588)

  - An issue was discovered in the kernel in NetBSD 7.1. An Access Point (AP) forwards EAPOL frames to other     clients even though the sender has not yet successfully authenticated to the AP. This might be abused in     projected Wi-Fi networks to launch denial-of-service attacks against connected clients and makes it easier     to exploit other vulnerabilities in connected clients. (CVE-2020-26139)

  - An issue was discovered in the ALFA Windows 10 driver 6.1316.1209 for AWUS036H. The Wi-Fi implementation     does not verify the Message Integrity Check (authenticity) of fragmented TKIP frames. An adversary can     abuse this to inject and possibly decrypt packets in WPA or WPA2 networks that support the TKIP data-     confidentiality protocol. (CVE-2020-26141)

  - An issue was discovered on Samsung Galaxy S3 i9305 4.4.4 devices. The WEP, WPA, WPA2, and WPA3     implementations accept second (or subsequent) broadcast fragments even when sent in plaintext and process     them as full unfragmented frames. An adversary can abuse this to inject arbitrary network packets     independent of the network configuration. (CVE-2020-26145)

  - An issue was discovered in the Linux kernel 5.8.9. The WEP, WPA, WPA2, and WPA3 implementations reassemble     fragments even though some of them were sent in plaintext. This vulnerability can be abused to inject     packets and/or exfiltrate selected fragments when another device sends fragmented frames and the WEP,     CCMP, or GCMP data-confidentiality protocol is used. (CVE-2020-26147)

  - Use After Free vulnerability in nfc sockets in the Linux Kernel before 5.12.4 allows local attackers to     elevate their privileges. In typical configurations, the issue can only be triggered by a privileged local     user with the CAP_NET_RAW capability. (CVE-2021-23134)

  - net/bluetooth/hci_request.c in the Linux kernel through 5.12.2 has a race condition for removal of the HCI     controller. (CVE-2021-32399)

  - In the Linux kernel before 5.12.4, net/bluetooth/hci_event.c has a use-after-free when destroying an     hci_chan, aka CID-5c4c8c954409. This leads to writing an arbitrary value. (CVE-2021-33034)

  - kernel/bpf/verifier.c in the Linux kernel through 5.12.7 enforces incorrect limits for pointer arithmetic     operations, aka CID-bb01a1bba579. This can be abused to perform out-of-bounds reads and writes in kernel     memory, leading to local privilege escalation to root. In particular, there is a corner case where the off     reg causes a masking direction change, which then results in an incorrect final aux->alu_limit.
    (CVE-2021-33200)

  - The io_uring subsystem in the Linux kernel allowed the MAX_RW_COUNT limit to be bypassed in the     PROVIDE_BUFFERS operation, which led to negative values being usedin mem_rw when reading /proc//mem.
    This could be used to create a heap overflow leading to arbitrary code execution in the kernel. It was     addressed via commit d1f82808877b (io_uring: truncate lengths larger than MAX_RW_COUNT on provide     buffers) (v5.13-rc1) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. It was     introduced in ddf0322db79c (io_uring: add IORING_OP_PROVIDE_BUFFERS) (v5.7-rc1). (CVE-2021-3491)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 / SLES_SAP12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:2451-1 advisory.

  - The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent     Privacy (WEP) doesn't require that received fragments be cleared from memory after (re)connecting to a     network. Under the right circumstances, when another device sends fragmented frames encrypted using WEP,     CCMP, or GCMP, this can be abused to inject arbitrary network packets and/or exfiltrate user data.
    (CVE-2020-24586)

  - The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent     Privacy (WEP) doesn't require that all fragments of a frame are encrypted under the same key. An adversary     can abuse this to decrypt selected fragments when another device sends fragmented frames and the WEP,     CCMP, or GCMP encryption key is periodically renewed. (CVE-2020-24587)

  - The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent     Privacy (WEP) doesn't require that the A-MSDU flag in the plaintext QoS header field is authenticated.
    Against devices that support receiving non-SSP A-MSDU frames (which is mandatory as part of 802.11n), an     adversary can abuse this to inject arbitrary network packets. (CVE-2020-24588)

  - An issue was discovered in the kernel in NetBSD 7.1. An Access Point (AP) forwards EAPOL frames to other     clients even though the sender has not yet successfully authenticated to the AP. This might be abused in     projected Wi-Fi networks to launch denial-of-service attacks against connected clients and makes it easier     to exploit other vulnerabilities in connected clients. (CVE-2020-26139)

  - An issue was discovered in the ALFA Windows 10 driver 6.1316.1209 for AWUS036H. The Wi-Fi implementation     does not verify the Message Integrity Check (authenticity) of fragmented TKIP frames. An adversary can     abuse this to inject and possibly decrypt packets in WPA or WPA2 networks that support the TKIP data-     confidentiality protocol. (CVE-2020-26141)

  - An issue was discovered on Samsung Galaxy S3 i9305 4.4.4 devices. The WEP, WPA, WPA2, and WPA3     implementations accept second (or subsequent) broadcast fragments even when sent in plaintext and process     them as full unfragmented frames. An adversary can abuse this to inject arbitrary network packets     independent of the network configuration. (CVE-2020-26145)

  - An issue was discovered in the Linux kernel 5.8.9. The WEP, WPA, WPA2, and WPA3 implementations reassemble     fragments even though some of them were sent in plaintext. This vulnerability can be abused to inject     packets and/or exfiltrate selected fragments when another device sends fragmented frames and the WEP,     CCMP, or GCMP data-confidentiality protocol is used. (CVE-2020-26147)

  - Bluetooth LE and BR/EDR secure pairing in Bluetooth Core Specification 2.1 through 5.2 may permit a nearby     man-in-the-middle attacker to identify the Passkey used during pairing (in the Passkey authentication     procedure) by reflection of the public key and the authentication evidence of the initiating device,     potentially permitting this attacker to complete authenticated pairing with the responding device using     the correct Passkey for the pairing session. The attack methodology determines the Passkey value one bit     at a time. (CVE-2020-26558)

  - An issue was discovered in the Linux kernel before 5.10. drivers/infiniband/core/ucma.c has a use-after-     free because the ctx is reached via the ctx_list in some ucma_migrate_id situations where ucma_close is     called, aka CID-f5449e74802c. (CVE-2020-36385)

  - An issue was discovered in the Linux kernel before 5.8.1. net/bluetooth/hci_event.c has a slab out-of-     bounds read in hci_extended_inquiry_result_evt, aka CID-51c19bf3d5cf. (CVE-2020-36386)

  - Improper access control in BlueZ may allow an authenticated user to potentially enable information     disclosure via adjacent access. (CVE-2021-0129)

  - In __hidinput_change_resolution_multipliers of hid-input.c, there is a possible out of bounds write due to     a heap buffer overflow. This could lead to local escalation of privilege with no additional execution     privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android     kernelAndroid ID: A-173843328References: Upstream kernel (CVE-2021-0512)

  - In pfkey_dump of af_key.c, there is a possible out-of-bounds read due to a missing bounds check. This     could lead to local information disclosure in the kernel with System execution privileges needed. User     interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-110373476     (CVE-2021-0605)

  - A heap out-of-bounds write affecting Linux since v2.6.19-rc1 was discovered in net/netfilter/x_tables.c.
    This allows an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name     space (CVE-2021-22555)

  - Use After Free vulnerability in nfc sockets in the Linux Kernel before 5.12.4 allows local attackers to     elevate their privileges. In typical configurations, the issue can only be triggered by a privileged local     user with the CAP_NET_RAW capability. (CVE-2021-23134)

  - net/bluetooth/hci_request.c in the Linux kernel through 5.12.2 has a race condition for removal of the HCI     controller. (CVE-2021-32399)

  - In the Linux kernel before 5.12.4, net/bluetooth/hci_event.c has a use-after-free when destroying an     hci_chan, aka CID-5c4c8c954409. This leads to writing an arbitrary value. (CVE-2021-33034)

  - fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer     allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an     unprivileged user, aka CID-8cae8cd89f05. (CVE-2021-33909)

  - net/can/bcm.c in the Linux kernel through 5.12.10 allows local users to obtain sensitive information from     kernel stack memory because parts of a data structure are uninitialized. (CVE-2021-34693)

  - .A flaw was found in the CAN BCM networking protocol in the Linux kernel, where a local attacker can abuse     a flaw in the CAN subsystem to corrupt memory, crash the system or escalate privileges. This race     condition in net/can/bcm.c in the Linux kernel allows for local privilege escalation to root.
    (CVE-2021-3609)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 21.04 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4997-2 advisory.

    USN-4997-1 fixed vulnerabilities in the Linux kernel for Ubuntu 21.04. This update provides the     corresponding updates for the Linux KVM kernel for Ubuntu 21.04.

    Norbert Slusarek discovered a race condition in the CAN BCM networking protocol of the Linux kernel     leading to multiple use-after-free vulnerabilities. A local attacker could use this issue to execute     arbitrary code. (CVE-2021-3609)

    Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel did not properly enforce limits     for pointer operations. A local attacker could use this to cause a denial of service (system crash) or     possibly execute arbitrary code. (CVE-2021-33200)

    Mathy Vanhoef discovered that the Linux kernels WiFi implementation did not properly clear received     fragments from memory in some situations. A physically proximate attacker could possibly use this issue to     inject packets or expose sensitive information. (CVE-2020-24586)

    Mathy Vanhoef discovered that the Linux kernels WiFi implementation incorrectly handled encrypted     fragments. A physically proximate attacker could possibly use this issue to decrypt fragments.
    (CVE-2020-24587)

    Mathy Vanhoef discovered that the Linux kernels WiFi implementation incorrectly handled certain     malformed frames. If a user were tricked into connecting to a malicious server, a physically proximate     attacker could use this issue to inject packets. (CVE-2020-24588)

    Mathy Vanhoef discovered that the Linux kernels WiFi implementation incorrectly handled EAPOL frames     from unauthenticated senders. A physically proximate attacker could inject malicious packets to cause a     denial of service (system crash). (CVE-2020-26139)

    Mathy Vanhoef discovered that the Linux kernels WiFi implementation did not properly verify certain     fragmented frames. A physically proximate attacker could possibly use this issue to inject or decrypt     packets. (CVE-2020-26141)

    Mathy Vanhoef discovered that the Linux kernels WiFi implementation accepted plaintext fragments in     certain situations. A physically proximate attacker could use this issue to inject packets.
    (CVE-2020-26145)

    Mathy Vanhoef discovered that the Linux kernels WiFi implementation could reassemble mixed encrypted     and plaintext fragments. A physically proximate attacker could possibly use this issue to inject packets     or exfiltrate selected fragments. (CVE-2020-26147)

    Or Cohen discovered that the SCTP implementation in the Linux kernel contained a race condition in some     situations, leading to a use-after-free condition. A local attacker could use this to cause a denial of     service (system crash) or possibly execute arbitrary code. (CVE-2021-23133)

    Or Cohen and Nadav Markus discovered a use-after-free vulnerability in the nfc implementation in the Linux     kernel. A privileged local attacker could use this issue to cause a denial of service (system crash) or     possibly execute arbitrary code. (CVE-2021-23134)

    Manfred Paul discovered that the extended Berkeley Packet Filter (eBPF) implementation in the Linux kernel     contained an out-of-bounds vulnerability. A local attacker could use this issue to execute arbitrary code.
    (CVE-2021-31440)

    Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel did not properly prevent     speculative loads in certain situations. A local attacker could use this to expose sensitive information     (kernel memory). (CVE-2021-31829)

    It was discovered that a race condition in the kernel Bluetooth subsystem could lead to use-after-free of     slab objects. An attacker could use this issue to possibly execute arbitrary code. (CVE-2021-32399)

    It was discovered that a use-after-free existed in the Bluetooth HCI driver of the Linux kernel. A local     attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.
    (CVE-2021-33034)

    It was discovered that an out-of-bounds (OOB) memory access flaw existed in the f2fs module of the Linux     kernel. A local attacker could use this issue to cause a denial of service (system crash). (CVE-2021-3506)

    Mathias Krause discovered that a null pointer dereference existed in the Nitro Enclaves kernel driver of     the Linux kernel. A local attacker could use this issue to cause a denial of service or possibly execute     arbitrary code. (CVE-2021-3543)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 7 host has a package installed that is affected by multiple vulnerabilities as referenced in the ELSA-2021-9453 advisory.

  - A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when     processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested     guest (L2). Due to improper validation of the int_ctl field, this issue could allow a malicious L1 to     enable AVIC support (Advanced Virtual Interrupt Controller) for the L2 guest. As a result, the L2 guest     would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak     of sensitive data or potential guest-to-host escape. This flaw affects Linux kernel versions prior to     5.14-rc7. (CVE-2021-3653)

  - net/can/bcm.c in the Linux kernel through 5.12.10 allows local users to obtain sensitive information from     kernel stack memory because parts of a data structure are uninitialized. (CVE-2021-34693)

  - An out-of-bounds memory write flaw was found in the Linux kernel's joystick devices subsystem in versions     before 5.9-rc1, in the way the user calls ioctl JSIOCSBTNMAP. This flaw allows a local user to crash the     system or possibly escalate their privileges on the system. The highest threat from this vulnerability is     to confidentiality, integrity, as well as system availability. (CVE-2021-3612)

  - The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent     Privacy (WEP) doesn't require that received fragments be cleared from memory after (re)connecting to a     network. Under the right circumstances, when another device sends fragmented frames encrypted using WEP,     CCMP, or GCMP, this can be abused to inject arbitrary network packets and/or exfiltrate user data.
    (CVE-2020-24586)

  - Use After Free vulnerability in nfc sockets in the Linux Kernel before 5.12.4 allows local attackers to     elevate their privileges. In typical configurations, the issue can only be triggered by a privileged local     user with the CAP_NET_RAW capability. (CVE-2021-23134)

  - The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent     Privacy (WEP) doesn't require that all fragments of a frame are encrypted under the same key. An adversary     can abuse this to decrypt selected fragments when another device sends fragmented frames and the WEP,     CCMP, or GCMP encryption key is periodically renewed. (CVE-2020-24587)

  - The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent     Privacy (WEP) doesn't require that the A-MSDU flag in the plaintext QoS header field is authenticated.
    Against devices that support receiving non-SSP A-MSDU frames (which is mandatory as part of 802.11n), an     adversary can abuse this to inject arbitrary network packets. (CVE-2020-24588)

  - An issue was discovered in the Linux kernel 5.8.9. The WEP, WPA, WPA2, and WPA3 implementations reassemble     fragments even though some of them were sent in plaintext. This vulnerability can be abused to inject     packets and/or exfiltrate selected fragments when another device sends fragmented frames and the WEP,     CCMP, or GCMP data-confidentiality protocol is used. (CVE-2020-26147)

  - .A flaw was found in the CAN BCM networking protocol in the Linux kernel, where a local attacker can abuse     a flaw in the CAN subsystem to corrupt memory, crash the system or escalate privileges. This race     condition in net/can/bcm.c in the Linux kernel allows for local privilege escalation to root.
    (CVE-2021-3609)

  - An issue was discovered in Linux: KVM through Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass     RO checks and can lead to pages being freed while still accessible by the VMM and guest. This allows users     with the ability to start and control a VM to read/write random pages of memory and can result in local     privilege escalation. (CVE-2021-22543)

  - A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when     processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested     guest (L2). Due to improper validation of the virt_ext field, this issue could allow a malicious L1 to     disable both VMLOAD/VMSAVE intercepts and VLS (Virtual VMLOAD/VMSAVE) for the L2 guest. As a result, the     L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire     system, leak of sensitive data or potential guest-to-host escape. (CVE-2021-3656)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
150985	Debian DLA-2689-1 : linux security update	Nessus	Debian Local Security Checks	6/24/2021	12/21/2023	high
151205	SUSE SLES15 Security Update : kernel (SUSE-SU-2021:2208-1)	Nessus	SuSE Local Security Checks	7/1/2021	7/13/2023	high
151280	openSUSE 15 Security Update : kernel (openSUSE-SU-2021:0947-1)	Nessus	SuSE Local Security Checks	7/2/2021	12/11/2023	high
152055	SUSE SLES12 Security Update : kernel (SUSE-SU-2021:2451-1)	Nessus	SuSE Local Security Checks	7/23/2021	7/13/2023	high
153127	Ubuntu 21.04 : Linux kernel (KVM) vulnerabilities (USN-4997-2)	Nessus	Ubuntu Local Security Checks	9/8/2021	8/27/2024	high
180951	Oracle Linux 7 : Unbreakable Enterprise kernel-container (ELSA-2021-9453)	Nessus	Oracle Linux Local Security Checks	9/7/2023	9/7/2023	high

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