High7.3Red Hat Linux

High [CVE-2026-43038] clear skb2->cb[] in ip6_err_gen_icmpv6_unreach()

This high-severity Red Hat Linux advisory covers CVE-2026-43038 affecting Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux AppStream E4S (v.9.2).

CVE-2026-43038 Published May 1, 2026

CVE-2026-43038

Affected products & platforms

Red Hat LinuxUnclassified

Open vendor advisory

Android app · Google Play

Monitor future Red Hat Linux CVEs from your phone.

Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 32 official vendor sources and 160+ reviewed platform categories.

Matching phone alertsOptional email delivery

Get CVE alerts See app features

Summary

clear skb2->cb[] in ip6_err_gen_icmpv6_unreach(). Red Hat rates this important (CVSS 7.3).

Weakness: CWE-843. Affected package(s): kernel, kernel-rt.

Resolved in Red Hat advisory RHSA-2026:25120 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: Red Hat Enterprise Linux AppStream EUS (v. 10.0); Red Hat Enterprise Linux AppStream (v. 10); Red Hat Enterprise Linux AppStream E4S (v.9.2); Red Hat Enterprise Linux AppStream E4S (v.9.4); and 44 more.

Affected versions

kernel-0:4.18.0-305.194.1.el8_4
kernel-rt-0:4.18.0-553.132.1.rt7.473.el8_10
kernel-0:4.18.0-477.145.1.el8_8
kernel-0:5.14.0-427.129.1.el9_4
kernel-0:4.18.0-372.195.1.el8_6
kernel-rt-0:5.14.0-284.174.1.rt14.459.el9_2
kernel-0:4.18.0-553.132.1.el8_10
kernel-0:5.14.0-687.19.1.el9_8
kernel-0:5.14.0-284.174.1.el9_2
kernel-0:6.12.0-211.28.1.el10_2
kernel-0:5.14.0-570.119.1.el9_6
kernel-0:6.12.0-55.77.1.el10_0

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

RHSA-2026:25120

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Update the affected package(s) to the fixed version shipped in RHSA-2026:25120 (`sudo dnf update` / `yum update`).

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Discussion(0)

No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.