mptcp: fix race in mptcp_pm_nl_flush_addrs_doit()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-23169
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-02-14 16:15:57 UTC
Updated2026-04-03 14:16:24 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: mptcp: fix race in mptcp_pm_nl_flush_addrs_doit() syzbot and Eulgyu Kim reported crashes in mptcp_pm_nl_get_local_id() and/or mptcp_pm_nl_is_backup() Root cause is list_splice_init() in mptcp_pm_nl_flush_addrs_doit() which is not RCU ready. list_splice_init_rcu() can not be called here while holding pernet->lock spinlock. Many thanks to Eulgyu Kim for providing a repro and testing our patches.

Risk And Classification

Primary CVSS: v3.1 4.7 MEDIUM from [email protected]

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

Problem Types: CWE-362

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary4.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:L/AC:H/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 141694df6573b49aa4143c92556544b4b0bbda72 338d40bab283da2639780ee3e458fb61f1567d8c git Not specified
CNA Linux Linux affected 141694df6573b49aa4143c92556544b4b0bbda72 7896dbe990d56d5bb8097863b2645355633665eb git Not specified
CNA Linux Linux affected 141694df6573b49aa4143c92556544b4b0bbda72 455e882192c9833f176f3fbbbb2f036b6c5bf555 git Not specified
CNA Linux Linux affected 141694df6573b49aa4143c92556544b4b0bbda72 51223bdd0f60b06cfc7f25885c4d4be917adba94 git Not specified
CNA Linux Linux affected 141694df6573b49aa4143c92556544b4b0bbda72 1f1b9523527df02685dde603f20ff6e603d8e4a1 git Not specified
CNA Linux Linux affected 141694df6573b49aa4143c92556544b4b0bbda72 e2a9eeb69f7d4ca4cf4c70463af77664fdb6ab1d git Not specified
CNA Linux Linux affected 5.11 Not specified
CNA Linux Linux unaffected 5.11 semver Not specified
CNA Linux Linux unaffected 5.15.201 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.164 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.125 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.72 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.9 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/455e882192c9833f176f3fbbbb2f036b6c5bf555 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1f1b9523527df02685dde603f20ff6e603d8e4a1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e2a9eeb69f7d4ca4cf4c70463af77664fdb6ab1d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/7896dbe990d56d5bb8097863b2645355633665eb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/338d40bab283da2639780ee3e458fb61f1567d8c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/51223bdd0f60b06cfc7f25885c4d4be917adba94 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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