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

  - CVE-2019-3016     It was discovered that the KVM implementation for x86     did not always perform TLB flushes when needed, if the     paravirtualised TLB flush feature was enabled. This     could lead to disclosure of sensitive information within     a guest VM.

  - CVE-2019-19462     The syzkaller tool found a missing error check in the     'relay' library used to implement various files under     debugfs. A local user permitted to access debugfs could     use this to cause a denial of service (crash) or     possibly for privilege escalation.

  - CVE-2020-0543     Researchers at VU Amsterdam discovered that on some     Intel CPUs supporting the RDRAND and RDSEED     instructions, part of a random value generated by these     instructions may be used in a later speculative     execution on any core of the same physical CPU.
    Depending on how these instructions are used by     applications, a local user or VM guest could use this to     obtain sensitive information such as cryptographic keys     from other users or VMs.

  This vulnerability can be mitigated by a microcode update, either as   part of system firmware (BIOS) or through the intel-microcode   package in Debian's non-free archive section. This kernel update   only provides reporting of the vulnerability and the option to   disable the mitigation if it is not needed.

  - CVE-2020-10711     Matthew Sheets reported NULL pointer dereference issues     in the SELinux subsystem while receiving CIPSO packet     with null category. A remote attacker can take advantage     of this flaw to cause a denial of service (crash). Note     that this issue does not affect the binary packages     distributed in Debian as CONFIG_NETLABEL is not enabled.

  - CVE-2020-10732     An information leak of kernel private memory to     userspace was found in the kernel's implementation of     core dumping userspace processes.

  - CVE-2020-10751     Dmitry Vyukov reported that the SELinux subsystem did     not properly handle validating multiple messages, which     could allow a privileged attacker to bypass SELinux     netlink restrictions.

  - CVE-2020-10757     Fan Yang reported a flaw in the way mremap handled DAX     hugepages, allowing a local user to escalate their     privileges.

  - CVE-2020-12114     Piotr Krysiuk discovered a race condition between the     umount and pivot_root operations in the filesystem core     (vfs). A local user with the CAP_SYS_ADMIN capability in     any user namespace could use this to cause a denial of     service (crash).

  - CVE-2020-12464     Kyungtae Kim reported a race condition in the USB core     that can result in a use-after-free. It is not clear how     this can be exploited, but it could result in a denial     of service (crash or memory corruption) or privilege     escalation.

  - CVE-2020-12768     A bug was discovered in the KVM implementation for AMD     processors, which could result in a memory leak. The     security impact of this is unclear.

  - CVE-2020-12770     It was discovered that the sg (SCSI generic) driver did     not correctly release internal resources in a particular     error case. A local user permitted to access an sg     device could possibly use this to cause a denial of     service (resource exhaustion).

  - CVE-2020-13143     Kyungtae Kim reported a potential heap out-of-bounds     write in the USB gadget subsystem. A local user     permitted to write to the gadget configuration     filesystem could use this to cause a denial of service     (crash or memory corruption) or potentially for     privilege escalation.

Detections

Analytics

Debian DSA-4699-1 : linux - security update

high Nessus Plugin ID 137341

Version 1.6

Version 1.5

Version 1.6 Mar 27, 2024, 7:16 PM Detection (Debian kernel vulns will now be evaluated against the running kernel version instead of the highest installed version) Plugin Feed: 202403271916
Version 1.5 Mar 7, 2024, 3:19 PM CVSS temporal metrics ("CVSSv2 temporal vector" set to "CVSS2#E:POC/RL:OF/RC:C". "CVSSv3 temporal vector" set to "CVSS:3.0/E:P/RL:O/RC:C") CVSSv3 score source (set to "CVE-2020-10757") Exploit attributes ("Exploit available" set to "True". "Exploitability ease" changed from "No known exploits are available" to "Exploits are available") Plugin Feed: 202403071519