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: can: j1939: j1939_session_new(): fix skb reference counting (CVE-2024-56645) * kernel: drm/sched: Fix potential double free in drm_sched_job_add_resv_dependencies (CVE-2025-40096) * kernel: mlxsw: spectrum_mr: Fix use-after-free when updating multicast route stats (CVE-2025-68800) * kernel: macvlan: fix error recovery in macvlan_common_newlink() (CVE-2026-23209) 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 Red Hat security advisory (RHSA-2026:6164) covers four kernel vulnerabilities: CVE-2024-56645 fixes skb reference counting in the CAN J1939 session creation; CVE-2025-40096 addresses a potential double free in the DRM scheduler job resource dependency addition; CVE-2025-68800 resolves a use-after-free in mlxsw spectrum multicast route statistics update; and CVE-2026-23209 corrects error recovery in macvlan link creation. These issues relate to resource management bugs (CWE-401, CWE-415, CWE-825) that could affect kernel stability or cause crashes. The advisory applies to Red Hat Enterprise Linux 9.6 Extended Update Support and associated CodeReady Linux Builder and AppStream/BaseOS EUS versions. The vendor has released updated kernel packages that fix these vulnerabilities and recommends applying the update followed by a system reboot.
Potential Impact
The vulnerabilities involve kernel resource management errors such as reference counting mistakes, double free, and use-after-free conditions. These could lead to kernel instability, crashes, or denial of service. No known exploits in the wild have been reported. The overall security impact is rated moderate by Red Hat.
Mitigation Recommendations
Red Hat has released updated kernel packages that address these vulnerabilities. Users should apply the available kernel update for Red Hat Enterprise Linux 9.6 Extended Update Support and related products as described in the advisory (https://access.redhat.com/articles/11258). A system reboot is required for the update to take effect. No additional mitigation actions are specified or required beyond applying the official update.
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: can: j1939: j1939_session_new(): fix skb reference counting (CVE-2024-56645) * kernel: drm/sched: Fix potential double free in drm_sched_job_add_resv_dependencies (CVE-2025-40096) * kernel: mlxsw: spectrum_mr: Fix use-after-free when updating multicast route stats (CVE-2025-68800) * kernel: macvlan: fix error recovery in macvlan_common_newlink() (CVE-2026-23209) 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
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This Red Hat security advisory (RHSA-2026:6164) covers four kernel vulnerabilities: CVE-2024-56645 fixes skb reference counting in the CAN J1939 session creation; CVE-2025-40096 addresses a potential double free in the DRM scheduler job resource dependency addition; CVE-2025-68800 resolves a use-after-free in mlxsw spectrum multicast route statistics update; and CVE-2026-23209 corrects error recovery in macvlan link creation. These issues relate to resource management bugs (CWE-401, CWE-415, CWE-825) that could affect kernel stability or cause crashes. The advisory applies to Red Hat Enterprise Linux 9.6 Extended Update Support and associated CodeReady Linux Builder and AppStream/BaseOS EUS versions. The vendor has released updated kernel packages that fix these vulnerabilities and recommends applying the update followed by a system reboot.
Potential Impact
The vulnerabilities involve kernel resource management errors such as reference counting mistakes, double free, and use-after-free conditions. These could lead to kernel instability, crashes, or denial of service. No known exploits in the wild have been reported. The overall security impact is rated moderate by Red Hat.
Mitigation Recommendations
Red Hat has released updated kernel packages that address these vulnerabilities. Users should apply the available kernel update for Red Hat Enterprise Linux 9.6 Extended Update Support and related products as described in the advisory (https://access.redhat.com/articles/11258). A system reboot is required for the update to take effect. No additional mitigation actions are specified or required beyond applying the official update.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:6164
- Cve Count
- 4
- Additional Cves
- ["CVE-2025-40096","CVE-2025-68800","CVE-2026-23209"]
- Cvss Version
- null
Threat ID: 6a18ab6fe29bf47b502887f7
Added to database: 05/28/2026, 20:54:07 UTC
Last enriched: 07/08/2026, 14:04:46 UTC
Last updated: 07/31/2026, 19:22:52 UTC
Views: 74
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.