Amazon Linux 2 : kernel (ALASKERNEL-5.15-2024-040)

high Nessus Plugin ID 192741

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Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of kernel installed on the remote host is prior to 5.15.152-100.162. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2KERNEL-5.15-2024-040 advisory.

2024-07-03: CVE-2023-52620 was added to this advisory.

2024-07-03: CVE-2024-0841 was added to this advisory.

2024-06-06: CVE-2024-27417 was added to this advisory.

2024-05-23: CVE-2024-26782 was added to this advisory.

2024-04-25: CVE-2024-26603 was added to this advisory.

A flaw was found in the smb client in the Linux kernel. A potential out-of-bounds error was seen in the smb2_parse_contexts() function. Validate offsets and lengths before dereferencing create contexts in smb2_parse_contexts(). (CVE-2023-52434)

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nf_tables: disallow timeout for anonymous sets (CVE-2023-52620)

A null pointer dereference flaw was found in the hugetlbfs_fill_super function in the Linux kernel hugetlbfs (HugeTLB pages) functionality. This issue may allow a local user to crash the system or potentially escalate their privileges on the system. (CVE-2024-0841)

A vulnerability was discovered in the Linux kernel's IPv4 networking stack. Under certain conditions, MPTCP and NetLabel can be configured in a way that triggers a double free memory error in net/ipv4/af_inet.c:inet_sock_destruct(). This may lead to a system crash, denial of service, or potential arbitrary code execution. (CVE-2024-1627)

In the Linux kernel, the following vulnerability has been resolved:

ext4: regenerate buddy after block freeing failed if under fc replay

This mostly reverts commit 6bd97bf273bd (ext4: remove redundantmb_regenerate_buddy()) and reintroduces mb_regenerate_buddy(). Based oncode in mb_free_blocks(), fast commit replay can end up marking as freeblocks that are already marked as such. This causes corruption of thebuddy bitmap so we need to regenerate it in that case. (CVE-2024-26601)

In the Linux kernel, the following vulnerability has been resolved:

x86/fpu: Stop relying on userspace for info to fault in xsave buffer

Before this change, the expected size of the user space buffer wastaken from fx_sw->xstate_size.
fx_sw->xstate_size can be changedfrom user-space, so it is possible construct a sigreturn frame where:

* fx_sw->xstate_size is smaller than the size required by valid bits infx_sw->xfeatures.* user-space unmaps parts of the sigrame fpu buffer so that not all ofthe buffer required by xrstor is accessible.

In this case, xrstor tries to restore and accesses the unmapped areawhich results in a fault. But fault_in_readable succeeds because buf +fx_sw->xstate_size is within the still mapped area, so it goes back andtries xrstor again. It will spin in this loop forever.

Instead, fault in the maximum size which can be touched by XRSTOR (takenfrom fpstate->user_size).

[ dhansen: tweak subject / changelog ] (CVE-2024-26603)

In the Linux kernel, the following vulnerability has been resolved:

mptcp: fix double-free on socket dismantle (CVE-2024-26782)

In the Linux kernel, the following vulnerability has been resolved:

ipv6: fix potential struct net leak in inet6_rtm_getaddr() (CVE-2024-27417)

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

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

Solution

Run 'yum update kernel' to update your system.

Plugin Details

Severity: High

ID: 192741

File Name: al2_ALASKERNEL-5_15-2024-040.nasl

Version: 1.4

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 4/1/2024

Updated: 7/4/2024

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.7

Temporal Score: 5.7

Vector: CVSS2#AV:A/AC:L/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2023-52434

CVSS v3

Risk Factor: High

Base Score: 8

Temporal Score: 7

Vector: CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:perf, p-cpe:/a:amazon:linux:python-perf, p-cpe:/a:amazon:linux:bpftool, p-cpe:/a:amazon:linux:perf-debuginfo, p-cpe:/a:amazon:linux:kernel-tools-debuginfo, p-cpe:/a:amazon:linux:kernel-debuginfo-common-aarch64, p-cpe:/a:amazon:linux:kernel-tools, p-cpe:/a:amazon:linux:kernel-devel, p-cpe:/a:amazon:linux:python-perf-debuginfo, p-cpe:/a:amazon:linux:kernel, p-cpe:/a:amazon:linux:kernel-debuginfo, p-cpe:/a:amazon:linux:kernel-headers, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:bpftool-debuginfo, p-cpe:/a:amazon:linux:kernel-tools-devel, p-cpe:/a:amazon:linux:kernel-debuginfo-common-x86_64, p-cpe:/a:amazon:linux:kernel-livepatch-5.15.152-100.162

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 3/27/2024

Vulnerability Publication Date: 2/20/2024

Reference Information

CVE: CVE-2023-52434, CVE-2023-52620, CVE-2024-0841, CVE-2024-1627, CVE-2024-26601, CVE-2024-26603, CVE-2024-26782, CVE-2024-27417

Detections

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