netfilter: xt_u32: reject invalid shift counts

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72350
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:08 UTC
Updated2026-08-17 06:18:39 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfilter: xt_u32: reject invalid shift counts u32_match_it() executes rule-supplied shift operands on a 32-bit value. A malformed u32 rule can provide a shift count of 32 or more, triggering an undefined shift out-of-bounds during packet evaluation. Validate XT_U32_LEFTSH and XT_U32_RIGHTSH operands in u32_mt_checkentry() and reject malformed rules before they reach the packet path.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001760000 probability, percentile 0.074000000 (date 2026-08-17)

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1b50b8a371e90a5e110f466e4ac02cf6b5f681de ca7c92d9701249e6daf132087756a88cbf2bb2a3 git Not specified
CNA Linux Linux affected 1b50b8a371e90a5e110f466e4ac02cf6b5f681de b33b44250d57ab0e5a1e2571b5285fb0d0a7f382 git Not specified
CNA Linux Linux affected 1b50b8a371e90a5e110f466e4ac02cf6b5f681de 728f479dc0447ae7eaef87926ff49142e415a811 git Not specified
CNA Linux Linux affected 1b50b8a371e90a5e110f466e4ac02cf6b5f681de 0a8b7a6d763775709c601f584e709ae48bcc000a git Not specified
CNA Linux Linux affected 1b50b8a371e90a5e110f466e4ac02cf6b5f681de cce42014415cecd98aa49b3950e7b02ee7c81268 git Not specified
CNA Linux Linux affected 1b50b8a371e90a5e110f466e4ac02cf6b5f681de a597a722fb71a534138c20359b655726622b5f17 git Not specified
CNA Linux Linux affected 1b50b8a371e90a5e110f466e4ac02cf6b5f681de 00d034fe8230dfc5832fe011ff2d81c1a2cc7a29 git Not specified
CNA Linux Linux affected 1b50b8a371e90a5e110f466e4ac02cf6b5f681de 64cdf7d30ac18e43df6c48004435febb965809a8 git Not specified
CNA Linux Linux affected 2.6.23 Not specified
CNA Linux Linux unaffected 2.6.23 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* 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/ca7c92d9701249e6daf132087756a88cbf2bb2a3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/728f479dc0447ae7eaef87926ff49142e415a811 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b33b44250d57ab0e5a1e2571b5285fb0d0a7f382 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/00d034fe8230dfc5832fe011ff2d81c1a2cc7a29 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a597a722fb71a534138c20359b655726622b5f17 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/64cdf7d30ac18e43df6c48004435febb965809a8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cce42014415cecd98aa49b3950e7b02ee7c81268 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0a8b7a6d763775709c601f584e709ae48bcc000a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

© CVE.report 2026

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report