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: mm: slub: avoid wake up kswapd in set_track_prepare (CVE-2025-39843) * kernel: can: j1939: implement NETDEV_UNREGISTER notification handler (CVE-2025-39925) 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 two kernel vulnerabilities in Red Hat Enterprise Linux 9.6 Extended Update Support. CVE-2025-39843 is a flaw in the kernel memory management SLUB allocator where waking up the kswapd daemon in set_track_prepare is avoided to fix the issue. CVE-2025-39925 addresses the lack of a NETDEV_UNREGISTER notification handler in the CAN J1939 networking subsystem. Both issues have been fixed in updated kernel packages provided by Red Hat. The advisory rates the impact as moderate and requires rebooting the system after applying the update.
Potential Impact
The vulnerabilities affect the Linux kernel core in Red Hat Enterprise Linux 9.6 Extended Update Support. The issues could potentially impact kernel stability or functionality related to memory management and CAN networking subsystems. The advisory classifies the security impact as moderate. There are no known exploits in the wild at this time.
Mitigation Recommendations
Red Hat has released updated kernel packages that address these vulnerabilities. Users should apply the security update for Red Hat Enterprise Linux 9.6 Extended Update Support as described in the Red Hat advisory RHSA-2025:23789. A system reboot is required for the update to take effect. Patch status is confirmed as available from the vendor advisory.
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: mm: slub: avoid wake up kswapd in set_track_prepare (CVE-2025-39843) * kernel: can: j1939: implement NETDEV_UNREGISTER notification handler (CVE-2025-39925) 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
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This advisory covers two kernel vulnerabilities in Red Hat Enterprise Linux 9.6 Extended Update Support. CVE-2025-39843 is a flaw in the kernel memory management SLUB allocator where waking up the kswapd daemon in set_track_prepare is avoided to fix the issue. CVE-2025-39925 addresses the lack of a NETDEV_UNREGISTER notification handler in the CAN J1939 networking subsystem. Both issues have been fixed in updated kernel packages provided by Red Hat. The advisory rates the impact as moderate and requires rebooting the system after applying the update.
Potential Impact
The vulnerabilities affect the Linux kernel core in Red Hat Enterprise Linux 9.6 Extended Update Support. The issues could potentially impact kernel stability or functionality related to memory management and CAN networking subsystems. The advisory classifies the security impact as moderate. There are no known exploits in the wild at this time.
Mitigation Recommendations
Red Hat has released updated kernel packages that address these vulnerabilities. Users should apply the security update for Red Hat Enterprise Linux 9.6 Extended Update Support as described in the Red Hat advisory RHSA-2025:23789. A system reboot is required for the update to take effect. Patch status is confirmed as available from the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2025:23789
- Cve Count
- 2
- Additional Cves
- ["CVE-2025-39925"]
Threat ID: 6a3da1d84853345fc1827d9e
Added to database: 06/25/2026, 21:47:04 UTC
Last enriched: 06/25/2026, 22:17:23 UTC
Last updated: 09/10/2026, 19:36:50 UTC
Views: 26
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