Red Hat Security Advisory: kernel security update
The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: smb: client: fix OOB reads parsing symlink error response (CVE-2026-31613) * kernel: Buffer overflow in drivers/xen/sys-hypervisor.c (CVE-2026-31786) * 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
This advisory covers three security fixes in the Linux kernel packages for Red Hat Enterprise Linux 9 and related variants. CVE-2026-31613 addresses an out-of-bounds read vulnerability in the SMB client when parsing symlink error responses. CVE-2026-31786 fixes a buffer overflow in the Xen hypervisor driver located in drivers/xen/sys-hypervisor.c. CVE-2026-46243 mitigates an issue where the SMB client improperly accepts userspace cifs.spnego descriptions, which could lead to security concerns. Red Hat has released updated kernel packages to remediate these issues, and a system reboot is required to apply the fixes.
Potential Impact
The vulnerabilities could potentially lead to memory corruption or information disclosure within the kernel, affecting the SMB client and Xen hypervisor driver components. The overall security impact is rated as Important by Red Hat, indicating these issues could be exploited to compromise system stability or security. There are no known exploits in the wild at the time of this advisory.
Mitigation Recommendations
Red Hat has released updated kernel packages that address these vulnerabilities. Users of Red Hat Enterprise Linux 9 and related products should apply the kernel update as provided in advisory RHSA-2026:24381 and reboot their systems to ensure the fixes take effect. For detailed update instructions, refer to https://access.redhat.com/articles/11258. No additional mitigations are indicated by the vendor.
Red Hat Security Advisory: kernel security update
Description
The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: smb: client: fix OOB reads parsing symlink error response (CVE-2026-31613) * kernel: Buffer overflow in drivers/xen/sys-hypervisor.c (CVE-2026-31786) * 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
This advisory covers three security fixes in the Linux kernel packages for Red Hat Enterprise Linux 9 and related variants. CVE-2026-31613 addresses an out-of-bounds read vulnerability in the SMB client when parsing symlink error responses. CVE-2026-31786 fixes a buffer overflow in the Xen hypervisor driver located in drivers/xen/sys-hypervisor.c. CVE-2026-46243 mitigates an issue where the SMB client improperly accepts userspace cifs.spnego descriptions, which could lead to security concerns. Red Hat has released updated kernel packages to remediate these issues, and a system reboot is required to apply the fixes.
Potential Impact
The vulnerabilities could potentially lead to memory corruption or information disclosure within the kernel, affecting the SMB client and Xen hypervisor driver components. The overall security impact is rated as Important by Red Hat, indicating these issues could be exploited to compromise system stability or security. There are no known exploits in the wild at the time of this advisory.
Mitigation Recommendations
Red Hat has released updated kernel packages that address these vulnerabilities. Users of Red Hat Enterprise Linux 9 and related products should apply the kernel update as provided in advisory RHSA-2026:24381 and reboot their systems to ensure the fixes take effect. For detailed update instructions, refer to https://access.redhat.com/articles/11258. No additional mitigations are indicated by the vendor.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:24381
- Cve Count
- 3
- Additional Cves
- ["CVE-2026-31786","CVE-2026-46243"]
Threat ID: 6a27320ee29bf47b509bf2dc
Added to database: 06/08/2026, 21:20:14 UTC
Last enriched: 08/07/2026, 00:06:45 UTC
Last updated: 09/14/2026, 22:01:33 UTC
Views: 891
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