Red Hat Security Advisory: kernel-rt security update
Multiple security vulnerabilities affecting the Red Hat Enterprise Linux Real Time kernel-rt packages have been addressed in a security update. These include several use-after-free bugs, denial of service issues, memory leaks, and potential privilege escalation vulnerabilities across various kernel components such as bridge multicast, Bluetooth management, multicast routing, bonding module, macvlan, and nf_tables. The update is rated as having moderate security impact. Systems running affected versions of Red Hat Enterprise Linux 9. 2 Real Time should apply the update and reboot to mitigate these issues.
AI Analysis
Technical Summary
The Red Hat kernel-rt security update addresses nine distinct vulnerabilities in the Real Time Linux Kernel used in Red Hat Enterprise Linux 9.2 Real Time variants. The flaws include use-after-free vulnerabilities in bridge multicast (CVE-2025-38248), Bluetooth management (CVE-2025-39981), multicast route stats update (CVE-2025-68800), bonding module (CVE-2026-23171), and nf_tables (CVE-2026-23231). Additionally, denial of service vulnerabilities are fixed in rxrpc_recvmsg (CVE-2026-23066) and DAMON sysfs (CVE-2026-23144). Other fixes include error recovery in macvlan (CVE-2026-23209) and skb header pointer handling in net/sched cls_u32 (CVE-2026-23204). The update requires a system reboot to take effect. No known exploits in the wild have been reported. The advisory rates the overall impact as moderate.
Potential Impact
The vulnerabilities collectively could lead to use-after-free conditions causing system crashes, denial of service, memory leaks, and potentially arbitrary code execution or privilege escalation on affected systems running the Real Time Linux Kernel. The impact is rated moderate by Red Hat Product Security. No known active exploitation has been reported at this time.
Mitigation Recommendations
Red Hat has released an official security update (RHSA-2026:9512) that addresses all identified vulnerabilities in the kernel-rt packages for Red Hat Enterprise Linux 9.2 Real Time variants. Users should apply the update promptly following the instructions in the Red Hat advisory and reboot affected systems to ensure the fixes take effect. Patch status is confirmed as available and official. No additional mitigation steps are indicated beyond applying the update and rebooting.
Red Hat Security Advisory: kernel-rt security update
Description
Multiple security vulnerabilities affecting the Red Hat Enterprise Linux Real Time kernel-rt packages have been addressed in a security update. These include several use-after-free bugs, denial of service issues, memory leaks, and potential privilege escalation vulnerabilities across various kernel components such as bridge multicast, Bluetooth management, multicast routing, bonding module, macvlan, and nf_tables. The update is rated as having moderate security impact. Systems running affected versions of Red Hat Enterprise Linux 9. 2 Real Time should apply the update and reboot to mitigate these issues.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Red Hat kernel-rt security update addresses nine distinct vulnerabilities in the Real Time Linux Kernel used in Red Hat Enterprise Linux 9.2 Real Time variants. The flaws include use-after-free vulnerabilities in bridge multicast (CVE-2025-38248), Bluetooth management (CVE-2025-39981), multicast route stats update (CVE-2025-68800), bonding module (CVE-2026-23171), and nf_tables (CVE-2026-23231). Additionally, denial of service vulnerabilities are fixed in rxrpc_recvmsg (CVE-2026-23066) and DAMON sysfs (CVE-2026-23144). Other fixes include error recovery in macvlan (CVE-2026-23209) and skb header pointer handling in net/sched cls_u32 (CVE-2026-23204). The update requires a system reboot to take effect. No known exploits in the wild have been reported. The advisory rates the overall impact as moderate.
Potential Impact
The vulnerabilities collectively could lead to use-after-free conditions causing system crashes, denial of service, memory leaks, and potentially arbitrary code execution or privilege escalation on affected systems running the Real Time Linux Kernel. The impact is rated moderate by Red Hat Product Security. No known active exploitation has been reported at this time.
Mitigation Recommendations
Red Hat has released an official security update (RHSA-2026:9512) that addresses all identified vulnerabilities in the kernel-rt packages for Red Hat Enterprise Linux 9.2 Real Time variants. Users should apply the update promptly following the instructions in the Red Hat advisory and reboot affected systems to ensure the fixes take effect. Patch status is confirmed as available and official. No additional mitigation steps are indicated beyond applying the update and rebooting.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:9512
- Cve Count
- 9
- Additional Cves
- ["CVE-2025-39981","CVE-2025-68800","CVE-2026-23066","CVE-2026-23144","CVE-2026-23171","CVE-2026-23204","CVE-2026-23209","CVE-2026-23231"]
- Cvss Version
- null
Threat ID: 6a18be67e29bf47b503872db
Added to database: 5/28/2026, 10:15:03 PM
Last enriched: 5/28/2026, 10:20:40 PM
Last updated: 5/29/2026, 1:31:50 PM
Views: 4
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