High7.8Red Hat Linux

High [CVE-2026-46243] Linux kernel: smb: client: reject userspace cifs.spnego descriptions

This high-severity Red Hat Linux advisory covers CVE-2026-46243 affecting NVIDIA for RHEL 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION.

CVE-2026-46243 Published May 26, 2026

CVE-2026-46243

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

Linux kernel: smb: client: reject userspace cifs.spnego descriptions. Red Hat rates this important (CVSS 7.8).

Weakness: CWE-825. Affected package(s): kernel, kernel-rt, rhcos, kpatch-patch.

Resolved in Red Hat advisory RHSA-2026:33219 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: NVIDIA for RHEL 10; Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION; Red Hat Enterprise Linux 7 Extended Lifecycle Support; and 19 more.

Affected versions

kernel-0:4.18.0-305.194.1.el8_4
kernel-0:4.18.0-553.129.1.el8_10
kernel-0:2.6.32-754.61.1.el6
kernel-rt-0:4.18.0-553.129.1.rt7.470.el8_10
rhcos-414.92.202606231112-0
kernel-0:4.18.0-372.196.1.el8_6
kernel-0:6.12.0-212.9.el10nv
kpatch-patch
kernel-0:5.14.0-570.123.1.el9_6
kernel-0:3.10.0-1160.153.1.el7
kernel-0:5.14.0-284.176.1.el9_2
kernel-rt-0:5.14.0-284.176.1.rt14.461.el9_2

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

Fixed versions

RHSA-2026:33219

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-2026:33219 (`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.