CVE-2024-27414 Affecting kernel-livepatch-6.1.82-99.168 package, versions <0:1.0-0.amzn2023


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.04% (12th percentile)

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  • Snyk IDSNYK-AMZN2023-KERNELLIVEPATCH618299168-8495306
  • published11 Dec 2024
  • disclosed17 May 2024

Introduced: 17 May 2024

CVE-2024-27414  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 kernel-livepatch-6.1.82-99.168 to version 0:1.0-0.amzn2023 or higher.
This issue was patched in ALAS2023-2024-784.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-livepatch-6.1.82-99.168 package and not the kernel-livepatch-6.1.82-99.168 package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

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

rtnetlink: fix error logic of IFLA_BRIDGE_FLAGS writing back

In the commit d73ef2d69c0d ("rtnetlink: let rtnl_bridge_setlink checks IFLA_BRIDGE_MODE length"), an adjustment was made to the old loop logic in the function rtnl_bridge_setlink to enable the loop to also check the length of the IFLA_BRIDGE_MODE attribute. However, this adjustment removed the break statement and led to an error logic of the flags writing back at the end of this function.

if (have_flags) memcpy(nla_data(attr), &flags, sizeof(flags)); // attr should point to IFLA_BRIDGE_FLAGS NLA !!!

Before the mentioned commit, the attr is granted to be IFLA_BRIDGE_FLAGS. However, this is not necessarily true fow now as the updated loop will let the attr point to the last NLA, even an invalid NLA which could cause overflow writes.

This patch introduces a new variable br_flag to save the NLA pointer that points to IFLA_BRIDGE_FLAGS and uses it to resolve the mentioned error logic.

CVSS Scores

version 3.1