CVE-2024-26826 Affecting kernel-rt-debuginfo package, versions <0:4.18.0-553.8.1.rt7.349.el8_10


Severity

Recommended
high

Based on Rocky Linux security rating.

Threat Intelligence

EPSS
0.05% (18th percentile)

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  • Snyk IDSNYK-ROCKY8-KERNELRTDEBUGINFO-7455743
  • published16 Jul 2024
  • disclosed17 Apr 2024

Introduced: 17 Apr 2024

CVE-2024-26826  (opens in a new tab)

How to fix?

Upgrade Rocky-Linux:8 kernel-rt-debuginfo to version 0:4.18.0-553.8.1.rt7.349.el8_10 or higher.
This issue was patched in RLSA-2024:4352.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-debuginfo package and not the kernel-rt-debuginfo package as distributed by Rocky-Linux. See How to fix? for Rocky-Linux:8 relevant fixed versions and status.

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

mptcp: fix data re-injection from stale subflow

When the MPTCP PM detects that a subflow is stale, all the packet scheduler must re-inject all the mptcp-level unacked data. To avoid acquiring unneeded locks, it first try to check if any unacked data is present at all in the RTX queue, but such check is currently broken, as it uses TCP-specific helper on an MPTCP socket.

Funnily enough fuzzers and static checkers are happy, as the accessed memory still belongs to the mptcp_sock struct, and even from a functional perspective the recovery completed successfully, as the short-cut test always failed.

A recent unrelated TCP change - commit d5fed5addb2b ("tcp: reorganize tcp_sock fast path variables") - exposed the issue, as the tcp field reorganization makes the mptcp code always skip the re-inection.

Fix the issue dropping the bogus call: we are on a slow path, the early optimization proved once again to be evil.

CVSS Scores

version 3.1