Red Hat Security Advisory: kernel-rt security update
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix(es): * kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions (CVE-2026-46243) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
AI Analysis
Technical Summary
The Linux kernel packages in Red Hat Enterprise Linux contain a vulnerability identified as CVE-2026-46243 affecting the SMB client, specifically in handling userspace cifs.spnego descriptions. This issue is addressed by rejecting such descriptions to prevent potential misuse. The fix is delivered via kpatch live patch modules for kernel versions 5.14.0-687.10.1.el9_8 and 6.12.0-211.16.1.el10_2. The advisory also includes a fix for CVE-2026-46331 related to net/sched act_pedit. Red Hat provides updated kpatch packages for multiple architectures and variants of RHEL 9 and 10. The advisory references official Red Hat documentation for applying these updates.
Potential Impact
The vulnerability affects the Linux kernel SMB client component in Red Hat Enterprise Linux, potentially allowing improper handling of userspace cifs.spnego descriptions. This could lead to security issues rated as high severity by Red Hat. No known exploits in the wild have been reported. The impact is mitigated by applying the provided kernel live patch updates.
Mitigation Recommendations
Red Hat has released official live patch updates (kpatch-patch-5_14_0-687_10_1 for RHEL 9 and kpatch-patch-6_12_0-211_16_1 for RHEL 10) that address CVE-2026-46243 and CVE-2026-46331. Users should apply these updates following Red Hat's guidance at https://access.redhat.com/articles/11258. The patches are available for multiple architectures and product variants. Applying these official patches fully mitigates the vulnerability.
Red Hat Security Advisory: kernel-rt security update
Description
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix(es): * kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions (CVE-2026-46243) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel packages in Red Hat Enterprise Linux contain a vulnerability identified as CVE-2026-46243 affecting the SMB client, specifically in handling userspace cifs.spnego descriptions. This issue is addressed by rejecting such descriptions to prevent potential misuse. The fix is delivered via kpatch live patch modules for kernel versions 5.14.0-687.10.1.el9_8 and 6.12.0-211.16.1.el10_2. The advisory also includes a fix for CVE-2026-46331 related to net/sched act_pedit. Red Hat provides updated kpatch packages for multiple architectures and variants of RHEL 9 and 10. The advisory references official Red Hat documentation for applying these updates.
Potential Impact
The vulnerability affects the Linux kernel SMB client component in Red Hat Enterprise Linux, potentially allowing improper handling of userspace cifs.spnego descriptions. This could lead to security issues rated as high severity by Red Hat. No known exploits in the wild have been reported. The impact is mitigated by applying the provided kernel live patch updates.
Mitigation Recommendations
Red Hat has released official live patch updates (kpatch-patch-5_14_0-687_10_1 for RHEL 9 and kpatch-patch-6_12_0-211_16_1 for RHEL 10) that address CVE-2026-46243 and CVE-2026-46331. Users should apply these updates following Red Hat's guidance at https://access.redhat.com/articles/11258. The patches are available for multiple architectures and product variants. Applying these official patches fully mitigates the vulnerability.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:23259
- Cve Count
- 1
- Cvss Version
- 3.1
Threat ID: 6a21eb15e29bf47b50d2416b
Added to database: 06/04/2026, 21:16:05 UTC
Last enriched: 08/07/2026, 00:07:46 UTC
Last updated: 09/14/2026, 22:01:34 UTC
Views: 363
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