CVE-2024-26826 Affecting kernel-debug-modules package, versions <0:5.14.0-427.42.1.el9_4
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Test your applications- Snyk ID SNYK-ALMALINUX9-KERNELDEBUGMODULES-8334562
- published 4 Nov 2024
- disclosed 30 Oct 2024
How to fix?
Upgrade AlmaLinux:9 kernel-debug-modules to version 0:5.14.0-427.42.1.el9_4 or higher.
This issue was patched in ALSA-2024:8617.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-debug-modules package and not the kernel-debug-modules package as distributed by AlmaLinux.
See How to fix? for AlmaLinux:9 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.
References
- https://errata.almalinux.org/8/ALSA-2024-4211.html
- https://errata.almalinux.org/8/ALSA-2024-4352.html
- https://errata.almalinux.org/9/ALSA-2024-8617.html
- https://access.redhat.com/security/cve/CVE-2024-26826
- https://access.redhat.com/errata/RHSA-2024:4211
- https://access.redhat.com/errata/RHSA-2024:4352
- https://access.redhat.com/errata/RHSA-2024:8617
- https://git.kernel.org/stable/c/624902eab7abcb8731b333ec73f206d38d839cd8
- https://git.kernel.org/stable/c/6673d9f1c2cd984390550dbdf7d5ae07b20abbf8
- https://git.kernel.org/stable/c/6f95120f898b40d13fd441225ef511307853c9c2
- https://git.kernel.org/stable/c/b609c783c535493aa3fca22c7e40a120370b1ca5
- https://git.kernel.org/stable/c/b6c620dc43ccb4e802894e54b651cf81495e9598