Red Hat Security Advisory: kernel 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: net: bridge: use a stable FDB dst snapshot in RCU readers (CVE-2026-46086) * kernel: xfrm: defensively unhash xfrm_state lists in __xfrm_state_delete (CVE-2026-46116) * kernel: XFS data corruption using reflink () 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 Red Hat kernel security update for Red Hat Enterprise Linux 8 addresses several vulnerabilities: CVE-2026-46086 involves the network bridge component using a stable forwarding database (FDB) destination snapshot in RCU readers; CVE-2026-46116 involves defensive unhashing of xfrm_state lists in the __xfrm_state_delete function; and an XFS filesystem data corruption issue related to reflink operations. These fixes are included in updated kernel packages that must be installed and followed by a system reboot. The advisory rates the update as Important and provides detailed package versions and checksums for verification.
Potential Impact
The vulnerabilities affect the Linux kernel's network bridge, xfrm state management, and XFS filesystem, potentially leading to system instability, data corruption, or security issues. The kernel is central to system operation, so these flaws could have significant impact if exploited. However, no known exploits in the wild have been reported. The update mitigates these risks by correcting the underlying code defects.
Mitigation Recommendations
Red Hat has released updated kernel packages that address these vulnerabilities. Users should apply the provided kernel update for Red Hat Enterprise Linux 8 as detailed in the Red Hat advisory (https://access.redhat.com/articles/11258) and reboot the system to activate the fixes. No additional mitigation steps are indicated by the vendor.
Red Hat Security Advisory: kernel 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: net: bridge: use a stable FDB dst snapshot in RCU readers (CVE-2026-46086) * kernel: xfrm: defensively unhash xfrm_state lists in __xfrm_state_delete (CVE-2026-46116) * kernel: XFS data corruption using reflink () 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 Red Hat kernel security update for Red Hat Enterprise Linux 8 addresses several vulnerabilities: CVE-2026-46086 involves the network bridge component using a stable forwarding database (FDB) destination snapshot in RCU readers; CVE-2026-46116 involves defensive unhashing of xfrm_state lists in the __xfrm_state_delete function; and an XFS filesystem data corruption issue related to reflink operations. These fixes are included in updated kernel packages that must be installed and followed by a system reboot. The advisory rates the update as Important and provides detailed package versions and checksums for verification.
Potential Impact
The vulnerabilities affect the Linux kernel's network bridge, xfrm state management, and XFS filesystem, potentially leading to system instability, data corruption, or security issues. The kernel is central to system operation, so these flaws could have significant impact if exploited. However, no known exploits in the wild have been reported. The update mitigates these risks by correcting the underlying code defects.
Mitigation Recommendations
Red Hat has released updated kernel packages that address these vulnerabilities. Users should apply the provided kernel update for Red Hat Enterprise Linux 8 as detailed in the Red Hat advisory (https://access.redhat.com/articles/11258) and reboot the system to activate the fixes. No additional mitigation steps are indicated by the vendor.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_vex
- Csaf Version
- 2.0
- Publisher
- Microsoft Security Response Center
- Advisory Id
- msrc_CVE-2026-46086
- Cve Count
- 1
- Additional Cves
- []
- Cvss Version
- null
Threat ID: 6a18ab7fe29bf47b50288e34
Added to database: 05/28/2026, 20:54:23 UTC
Last enriched: 07/26/2026, 01:56:46 UTC
Last updated: 07/31/2026, 22:14:48 UTC
Views: 47
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