netfilter: nf_conntrack: defer invalid log until after unlock

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74624
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-22 16:16:35 UTC
Updated2026-08-25 06:18:40 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack: defer invalid log until after unlock TCP and SCTP conntrack paths can emit invalid-packet logs while ct->lock is still held. When invalid logging is routed to nfnetlink_log and conntrack export is enabled, the log path can re-enter conntrack netlink glue and dump the same conntrack again. Protocol attribute dumping may take ct->lock, so logging while holding that lock can deadlock. Defer the TCP invalid logs by storing only the minimal log context while ct->lock is held and emitting the log after unlocking. Also make the TCP timeout-lowering invalid path return whether a log is needed, then emit that log after unlocking. Do the same for the SCTP invalid state-transition log that can be reached while ct->lock is held. Add a lockdep assertion to nf_ct_l4proto_log_invalid() so future callers that log invalid conntracks while holding ct->lock are caught outside TCP and SCTP as well.

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: 0.004790000 probability, percentile 0.391960000 (date 2026-08-25)

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 d9a6f0d0df1899ff9086a57abc600e414f4b8cdd ca97360eba4b3dc67f1804625542f4ccc774242a git Not specified
CNA Linux Linux affected d9a6f0d0df1899ff9086a57abc600e414f4b8cdd 63853eb20bba4e00b7cd0b8cfc19337bbaaf5037 git Not specified
CNA Linux Linux affected d9a6f0d0df1899ff9086a57abc600e414f4b8cdd 9480fcf70a5aa9d320088a01c95df0e5e6391f4a git Not specified
CNA Linux Linux affected d9a6f0d0df1899ff9086a57abc600e414f4b8cdd 0424186d570aa4d1ad17f516afb86bd9eaa4f42e git Not specified
CNA Linux Linux affected d9a6f0d0df1899ff9086a57abc600e414f4b8cdd c0224327b7cbed9d3198e8dbec847281053dcd06 git Not specified
CNA Linux Linux affected d9a6f0d0df1899ff9086a57abc600e414f4b8cdd 2d19b95c9723001f214f7a47d67b09f46238f200 git Not specified
CNA Linux Linux affected 6.1 Not specified
CNA Linux Linux unaffected 6.1 semver Not specified
CNA Linux Linux unaffected 6.1.184 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.152 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.104 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.45 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.9 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2d19b95c9723001f214f7a47d67b09f46238f200 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9480fcf70a5aa9d320088a01c95df0e5e6391f4a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0424186d570aa4d1ad17f516afb86bd9eaa4f42e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ca97360eba4b3dc67f1804625542f4ccc774242a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c0224327b7cbed9d3198e8dbec847281053dcd06 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/63853eb20bba4e00b7cd0b8cfc19337bbaaf5037 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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