mptcp: avoid unneeded actions on subflow reset

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-97524
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:02 UTC
Updated2026-10-19 10:17:21 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: mptcp: avoid unneeded actions on subflow reset Once in a blue moon, the mptcp receive path can recursively call mptcp_data_ready() via state change under unlucky error conditions, and then try to hold the data lock again. Break the recursion loop explicitly checking for the exceptional condition. Add a new flag instead of using an existing one like 'closing', to exit early in subflow_state_change(), and explicitly flush the RX queue at reset time. This avoids unneeded processing to check for available data -- calling get_mapping_status() and more on a dying subflow -- but also in error reporting and worker scheduling. Note that we must consume the currently peeked skb before invoking mptcp_dss_corruption to avoid consuming it again after the eventual reset has freed it.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.006860000 probability, percentile 0.509760000 (date 2026-10-05)

VersionSourceTypeScoreSeverityVector
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
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected fde99e972b8f88cebe619241d7aa43d288ef666a 6d669c740933124eae3df8cfc15995af9bcc6aba git Not specified
CNA Linux Linux affected 12c1676d598e3b8dd92a033b623b792cc2ea1ec5 83a7dcdd2b1060484528da70a643125174d47e5a git Not specified
CNA Linux Linux affected 35668f8ec84f6c944676e48ecc6bbc5fc8e6fe25 a370e56024df0b07e3120c45a9773ae123819fd6 git Not specified
CNA Linux Linux affected b8be15d1ae7ea4eedd547c3b3141f592fbddcd30 1962841387087970d75ba8b8d4c2aa2d45705e50 git Not specified
CNA Linux Linux affected e32d262c89e2b22cb0640223f953b548617ed8a6 4b7abdcb5ba832fafab679f0d998af39cbc99307 git Not specified
CNA Linux Linux affected e32d262c89e2b22cb0640223f953b548617ed8a6 b2dbcc1ed48b5ac070a41db4a52aade6823c4df0 git Not specified
CNA Linux Linux affected e32d262c89e2b22cb0640223f953b548617ed8a6 ce7e4ede01ed3e47a48c0f1ce1d87bf4864bee9f git Not specified
CNA Linux Linux affected e32d262c89e2b22cb0640223f953b548617ed8a6 2b0f561f21b27c40c91ea4975268a06092bd7e9c git Not specified
CNA Linux Linux affected 8bfd391bde685df7289b928ce8876a3583be4bfb git Not specified
CNA Linux Linux affected 5.10.228 5.10.271 semver Not specified
CNA Linux Linux affected 5.15.169 5.15.222 semver Not specified
CNA Linux Linux affected 6.1.113 6.1.189 semver Not specified
CNA Linux Linux affected 6.6.57 6.6.158 semver Not specified
CNA Linux Linux affected 6.11.4 6.12 semver Not specified
CNA Linux Linux affected 6.12 Not specified
CNA Linux Linux unaffected 6.12 semver Not specified
CNA Linux Linux unaffected 5.10.271 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.222 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.189 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b2dbcc1ed48b5ac070a41db4a52aade6823c4df0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2b0f561f21b27c40c91ea4975268a06092bd7e9c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a370e56024df0b07e3120c45a9773ae123819fd6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6d669c740933124eae3df8cfc15995af9bcc6aba 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ce7e4ede01ed3e47a48c0f1ce1d87bf4864bee9f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1962841387087970d75ba8b8d4c2aa2d45705e50 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4b7abdcb5ba832fafab679f0d998af39cbc99307 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/83a7dcdd2b1060484528da70a643125174d47e5a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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