netfilter: x_tables: guard option walkers against 1-byte tail reads

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-43452
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-08 15:16:57 UTC
Updated2026-05-11 08:16:14 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfilter: x_tables: guard option walkers against 1-byte tail reads When the last byte of options is a non-single-byte option kind, walkers that advance with i += op[i + 1] ? : 1 can read op[i + 1] past the end of the option area. Add an explicit i == optlen - 1 check before dereferencing op[i + 1] in xt_tcpudp and xt_dccp option walkers.

Risk And Classification

Primary CVSS: v3.1 8.2 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.000240000 probability, percentile 0.070400000 (date 2026-05-10)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
3.1CNADECLARED8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2e4e6a17af35be359cc8f1c924f8f198fbd478cc c2a445367a496a3c25dbc940c10c8bd1cfd4c14a git Not specified
CNA Linux Linux affected 2e4e6a17af35be359cc8f1c924f8f198fbd478cc ae1e1267650638136b84c23f2b31250f0ccb6823 git Not specified
CNA Linux Linux affected 2e4e6a17af35be359cc8f1c924f8f198fbd478cc c39f84e4be1be63fc60ca7141ea7b76edcea5907 git Not specified
CNA Linux Linux affected 2e4e6a17af35be359cc8f1c924f8f198fbd478cc 9b94f0e42ed248eb31929da84ed9f5310d7ff540 git Not specified
CNA Linux Linux affected 2e4e6a17af35be359cc8f1c924f8f198fbd478cc 5b18b8b35c7cded2d17b2b2604c9b0694ff48d1c git Not specified
CNA Linux Linux affected 2e4e6a17af35be359cc8f1c924f8f198fbd478cc bc18551c6169eac5ed813778d3e3e484002dbbe5 git Not specified
CNA Linux Linux affected 2e4e6a17af35be359cc8f1c924f8f198fbd478cc d04800323336eebf441d153f43234eac9b833d36 git Not specified
CNA Linux Linux affected 2e4e6a17af35be359cc8f1c924f8f198fbd478cc cfe770220ac2dbd3e104c6b45094037455da81d4 git Not specified
CNA Linux Linux affected 2.6.16 Not specified
CNA Linux Linux unaffected 2.6.16 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.167 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.130 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.78 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.19 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.9 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9b94f0e42ed248eb31929da84ed9f5310d7ff540 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c2a445367a496a3c25dbc940c10c8bd1cfd4c14a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d04800323336eebf441d153f43234eac9b833d36 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cfe770220ac2dbd3e104c6b45094037455da81d4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c39f84e4be1be63fc60ca7141ea7b76edcea5907 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5b18b8b35c7cded2d17b2b2604c9b0694ff48d1c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ae1e1267650638136b84c23f2b31250f0ccb6823 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bc18551c6169eac5ed813778d3e3e484002dbbe5 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