netfilter: xt_policy: fix strict mode inbound policy matching

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Summary

CVECVE-2026-52920
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 08:16:21 UTC
Updated2026-07-08 17:58:21 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfilter: xt_policy: fix strict mode inbound policy matching match_policy_in() walks sec_path entries from the last transform to the first one, but strict policy matching needs to consume info->pol[] in the same forward order as the rule layout. Derive the strict-match policy position from the number of transforms already consumed so that multi-element inbound rules are matched consistently.

Risk And Classification

Primary CVSS: v3.1 8.3 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.002990000 probability, percentile 0.216580000 (date 2026-07-09)

Problem Types: NVD-CWE-noinfo

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.3HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
3.1CNADECLARED8.3HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/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 c4b885139203d37f76662c37ae645fe8e0f4e4e5 eb323f7b82d2e2f638de0cc2a177803eb20e0707 git Not specified
CNA Linux Linux affected c4b885139203d37f76662c37ae645fe8e0f4e4e5 fc1c518bb1f054831ecabb32da9b8e1dff9699c6 git Not specified
CNA Linux Linux affected c4b885139203d37f76662c37ae645fe8e0f4e4e5 f98b7f85e04b40e28b08c461ded0cc79f14f5509 git Not specified
CNA Linux Linux affected c4b885139203d37f76662c37ae645fe8e0f4e4e5 82664d0f1ba25e4f9a71994954abae24c60f4067 git Not specified
CNA Linux Linux affected c4b885139203d37f76662c37ae645fe8e0f4e4e5 b130a6eefa02bd4d475f2f059da8bcfb3e7d18d9 git Not specified
CNA Linux Linux affected c4b885139203d37f76662c37ae645fe8e0f4e4e5 938867e870fb5471bb16f442aeac81326e05bf65 git Not specified
CNA Linux Linux affected c4b885139203d37f76662c37ae645fe8e0f4e4e5 392cc1d8408b5665215c1e9290bbf0f92339b043 git Not specified
CNA Linux Linux affected c4b885139203d37f76662c37ae645fe8e0f4e4e5 4b2b4d7d4e203c92db8966b163edfacb1f0e1e29 git Not specified
CNA Linux Linux affected 2.6.17 Not specified
CNA Linux Linux unaffected 2.6.17 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.141 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4b2b4d7d4e203c92db8966b163edfacb1f0e1e29 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/938867e870fb5471bb16f442aeac81326e05bf65 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b130a6eefa02bd4d475f2f059da8bcfb3e7d18d9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f98b7f85e04b40e28b08c461ded0cc79f14f5509 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/eb323f7b82d2e2f638de0cc2a177803eb20e0707 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/82664d0f1ba25e4f9a71994954abae24c60f4067 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fc1c518bb1f054831ecabb32da9b8e1dff9699c6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/392cc1d8408b5665215c1e9290bbf0f92339b043 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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