CVE-2024-26826
Vulnerability from cvelistv5
Published
2024-04-17 09:43
Modified
2024-12-19 08:48
Severity ?
Summary
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/624902eab7abcb8731b333ec73f206d38d839cd8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6673d9f1c2cd984390550dbdf7d5ae07b20abbf8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6f95120f898b40d13fd441225ef511307853c9c2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b609c783c535493aa3fca22c7e40a120370b1ca5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b6c620dc43ccb4e802894e54b651cf81495e9598
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/624902eab7abcb8731b333ec73f206d38d839cd8
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6673d9f1c2cd984390550dbdf7d5ae07b20abbf8
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6f95120f898b40d13fd441225ef511307853c9c2
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b609c783c535493aa3fca22c7e40a120370b1ca5
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b6c620dc43ccb4e802894e54b651cf81495e9598
Impacted products
Vendor Product Version
Linux Linux Version: 5.15
Show details on NVD website

To clipboard 

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