CVE - CVE-2024-26826

CVE-ID
CVE-2024-26826	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/624902eab7abcb8731b333ec73f206d38d839cd8 URL:https://git.kernel.org/stable/c/624902eab7abcb8731b333ec73f206d38d839cd8 MISC:https://git.kernel.org/stable/c/6673d9f1c2cd984390550dbdf7d5ae07b20abbf8 URL:https://git.kernel.org/stable/c/6673d9f1c2cd984390550dbdf7d5ae07b20abbf8 MISC:https://git.kernel.org/stable/c/6f95120f898b40d13fd441225ef511307853c9c2 URL:https://git.kernel.org/stable/c/6f95120f898b40d13fd441225ef511307853c9c2 MISC:https://git.kernel.org/stable/c/b609c783c535493aa3fca22c7e40a120370b1ca5 URL:https://git.kernel.org/stable/c/b609c783c535493aa3fca22c7e40a120370b1ca5 MISC:https://git.kernel.org/stable/c/b6c620dc43ccb4e802894e54b651cf81495e9598 URL:https://git.kernel.org/stable/c/b6c620dc43ccb4e802894e54b651cf81495e9598
Assigning CNA
kernel.org
Date Record Created
20240219	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240219)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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