mptcp: fix data re-injection from stale subflow

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2024-26826
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-04-17 10:15:09 UTC
Updated2026-08-04 11:17:11 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: NVD-CWE-noinfo

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1e1d9d6f119c55c05e8ea78ed3e49046690abffd 6f95120f898b40d13fd441225ef511307853c9c2 git Not specified
CNA Linux Linux affected 1e1d9d6f119c55c05e8ea78ed3e49046690abffd 6673d9f1c2cd984390550dbdf7d5ae07b20abbf8 git Not specified
CNA Linux Linux affected 1e1d9d6f119c55c05e8ea78ed3e49046690abffd b609c783c535493aa3fca22c7e40a120370b1ca5 git Not specified
CNA Linux Linux affected 1e1d9d6f119c55c05e8ea78ed3e49046690abffd 624902eab7abcb8731b333ec73f206d38d839cd8 git Not specified
CNA Linux Linux affected 1e1d9d6f119c55c05e8ea78ed3e49046690abffd b6c620dc43ccb4e802894e54b651cf81495e9598 git Not specified
CNA Linux Linux affected 5.15 Not specified
CNA Linux Linux unaffected 5.15 semver Not specified
CNA Linux Linux unaffected 5.15.149 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.79 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.18 6.6.* semver Not specified
CNA Linux Linux unaffected 6.7.6 6.7.* semver Not specified
CNA Linux Linux unaffected 6.8 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/624902eab7abcb8731b333ec73f206d38d839cd8 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/b609c783c535493aa3fca22c7e40a120370b1ca5 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/6673d9f1c2cd984390550dbdf7d5ae07b20abbf8 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/6f95120f898b40d13fd441225ef511307853c9c2 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/b6c620dc43ccb4e802894e54b651cf81495e9598 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
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