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: net: sched: act_csum: validate nested VLAN headers (CVE-2026-31684) * kernel: rtmutex: Use waiter::task instead of current in remove_waiter() (CVE-2026-43499) * kernel: xfrm: defensively unhash xfrm_state lists in __xfrm_state_delete (CVE-2026-46116) * kernel: futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock (CVE-2026-53166) 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-rt packages, which provide a Real Time Linux Kernel for systems requiring high determinism, have received an important security update addressing four vulnerabilities: CVE-2026-31684 fixes validation of nested VLAN headers in the network scheduler checksum; CVE-2026-43499 corrects the use of waiter::task instead of current in remove_waiter() in rtmutex; CVE-2026-46116 defensively unhashes xfrm_state lists during deletion to prevent potential issues; and CVE-2026-53166 prevents a NULL pointer dereference in remove_waiter() on self-deadlock in futex requeue. These vulnerabilities affect Red Hat Enterprise Linux for Real Time 7 Extended Lifecycle Support versions, specifically kernel-rt-3.10.0-1160.156.1.rt56.1308.el7. The update is rated as important by Red Hat Product Security.
Potential Impact
The vulnerabilities fixed could potentially lead to kernel-level issues such as improper handling of network packets, incorrect mutex operations, unsafe state list management, and kernel crashes due to NULL pointer dereferences. These issues may affect system stability and security on affected Red Hat Enterprise Linux for Real Time 7 systems.
Mitigation Recommendations
Red Hat has released an updated kernel-rt package addressing these vulnerabilities. Users should apply the update as described in the Red Hat advisory RHSA-2026:41234 and reboot their systems to ensure the fixes take effect. Detailed update instructions are available at https://access.redhat.com/articles/11258. No known exploits in the wild have been reported at this time.
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: net: sched: act_csum: validate nested VLAN headers (CVE-2026-31684) * kernel: rtmutex: Use waiter::task instead of current in remove_waiter() (CVE-2026-43499) * kernel: xfrm: defensively unhash xfrm_state lists in __xfrm_state_delete (CVE-2026-46116) * kernel: futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock (CVE-2026-53166) 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-rt packages, which provide a Real Time Linux Kernel for systems requiring high determinism, have received an important security update addressing four vulnerabilities: CVE-2026-31684 fixes validation of nested VLAN headers in the network scheduler checksum; CVE-2026-43499 corrects the use of waiter::task instead of current in remove_waiter() in rtmutex; CVE-2026-46116 defensively unhashes xfrm_state lists during deletion to prevent potential issues; and CVE-2026-53166 prevents a NULL pointer dereference in remove_waiter() on self-deadlock in futex requeue. These vulnerabilities affect Red Hat Enterprise Linux for Real Time 7 Extended Lifecycle Support versions, specifically kernel-rt-3.10.0-1160.156.1.rt56.1308.el7. The update is rated as important by Red Hat Product Security.
Potential Impact
The vulnerabilities fixed could potentially lead to kernel-level issues such as improper handling of network packets, incorrect mutex operations, unsafe state list management, and kernel crashes due to NULL pointer dereferences. These issues may affect system stability and security on affected Red Hat Enterprise Linux for Real Time 7 systems.
Mitigation Recommendations
Red Hat has released an updated kernel-rt package addressing these vulnerabilities. Users should apply the update as described in the Red Hat advisory RHSA-2026:41234 and reboot their systems to ensure the fixes take effect. Detailed update instructions are available at https://access.redhat.com/articles/11258. No known exploits in the wild have been reported at this time.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:41234
- Cve Count
- 4
- Additional Cves
- ["CVE-2026-43499","CVE-2026-46116","CVE-2026-53166"]
- Cvss Version
- null
Threat ID: 6a600ab59c2644c7f8fe2110
Added to database: 07/22/2026, 00:11:33 UTC
Last enriched: 07/30/2026, 14:45:43 UTC
Last updated: 09/09/2026, 22:52:10 UTC
Views: 106
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