netfilter: xt_connmark: reject invalid shift parameters

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72347
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:08 UTC
Updated2026-08-17 06:18:38 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfilter: xt_connmark: reject invalid shift parameters Revision 2 of the CONNMARK target accepts user-controlled shift parameters and applies them to 32-bit mark values in connmark_tg_shift(). A shift_bits value of 32 or more triggers an undefined-shift bug when the rule is evaluated. Invalid shift_dir values are also accepted and silently fall back to the left-shift path. Reject invalid revision-2 shift parameters in connmark_tg_check() so malformed rules fail at installation time, before they can reach the packet path.

Risk And Classification

Primary CVSS: v3.1 7.3 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001740000 probability, percentile 0.071220000 (date 2026-08-17)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.3HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
3.1CNADECLARED7.3HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 472a73e00757b971d613d796374d2727b2e4954d d8ce63d928b457fba7ed1e302492dfd32293671c git Not specified
CNA Linux Linux affected 472a73e00757b971d613d796374d2727b2e4954d 9657bb11a6376ab0a79f05d433713d6944111e9d git Not specified
CNA Linux Linux affected 472a73e00757b971d613d796374d2727b2e4954d 8ace320ac4416f5e5fbcd065309fb2dfcce787b0 git Not specified
CNA Linux Linux affected 472a73e00757b971d613d796374d2727b2e4954d c3fa852d117b3fda72265e4230e3967db4a74fcf git Not specified
CNA Linux Linux affected 472a73e00757b971d613d796374d2727b2e4954d 4eef84b09a3836919360c4232b0f16651a155eec git Not specified
CNA Linux Linux affected 472a73e00757b971d613d796374d2727b2e4954d 230173cc6105bdfb2696d37e6e56687b003fbe63 git Not specified
CNA Linux Linux affected 472a73e00757b971d613d796374d2727b2e4954d 1b47026fb4b35bac850ad6e8a4ad7fc018e09ebc git Not specified
CNA Linux Linux affected 4.17 Not specified
CNA Linux Linux unaffected 4.17 semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d8ce63d928b457fba7ed1e302492dfd32293671c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9657bb11a6376ab0a79f05d433713d6944111e9d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8ace320ac4416f5e5fbcd065309fb2dfcce787b0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4eef84b09a3836919360c4232b0f16651a155eec 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/230173cc6105bdfb2696d37e6e56687b003fbe63 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c3fa852d117b3fda72265e4230e3967db4a74fcf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1b47026fb4b35bac850ad6e8a4ad7fc018e09ebc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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