Red Hat Security Advisory: kernel-rt security update
The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: macvlan: fix possible UAF in macvlan_forward_source() (CVE-2026-23001) * kernel: net/sched: cls_u32: use skb_header_pointer_careful() (CVE-2026-23204) * kernel: kernel: Privilege escalation or denial of service via use-after-free in nf_tables_addchain() (CVE-2026-23231) 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 three security vulnerabilities in the Red Hat kernel-rt packages, which provide the Real Time Linux Kernel for systems requiring high determinism. The first vulnerability (CVE-2026-23001) is a possible use-after-free in the macvlan_forward_source() function. The second (CVE-2026-23204) involves the net/sched cls_u32 component, where skb_header_pointer_careful() is now used to prevent issues. The third (CVE-2026-23231) is a use-after-free vulnerability in nf_tables_addchain() that could lead to privilege escalation or denial of service. These vulnerabilities have been rated with moderate security impact by Red Hat. The advisory references updated kernel-rt packages for Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions and requires a reboot after applying the update.
Potential Impact
The vulnerabilities could allow an attacker to cause use-after-free conditions, potentially leading to privilege escalation or denial of service on affected systems running the Real Time Linux Kernel. The impact is rated as moderate by Red Hat Product Security. There are no known exploits in the wild at the time of this advisory.
Mitigation Recommendations
A security update is available from Red Hat for the kernel-rt packages in Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions. Applying this update and rebooting the system is required to remediate the vulnerabilities. Refer to Red Hat's official advisory RHSA-2026:9835 and the update instructions at https://access.redhat.com/articles/11258 for detailed guidance.
Red Hat Security Advisory: kernel-rt security update
Description
The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: macvlan: fix possible UAF in macvlan_forward_source() (CVE-2026-23001) * kernel: net/sched: cls_u32: use skb_header_pointer_careful() (CVE-2026-23204) * kernel: kernel: Privilege escalation or denial of service via use-after-free in nf_tables_addchain() (CVE-2026-23231) 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-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This advisory covers three security vulnerabilities in the Red Hat kernel-rt packages, which provide the Real Time Linux Kernel for systems requiring high determinism. The first vulnerability (CVE-2026-23001) is a possible use-after-free in the macvlan_forward_source() function. The second (CVE-2026-23204) involves the net/sched cls_u32 component, where skb_header_pointer_careful() is now used to prevent issues. The third (CVE-2026-23231) is a use-after-free vulnerability in nf_tables_addchain() that could lead to privilege escalation or denial of service. These vulnerabilities have been rated with moderate security impact by Red Hat. The advisory references updated kernel-rt packages for Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions and requires a reboot after applying the update.
Potential Impact
The vulnerabilities could allow an attacker to cause use-after-free conditions, potentially leading to privilege escalation or denial of service on affected systems running the Real Time Linux Kernel. The impact is rated as moderate by Red Hat Product Security. There are no known exploits in the wild at the time of this advisory.
Mitigation Recommendations
A security update is available from Red Hat for the kernel-rt packages in Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions. Applying this update and rebooting the system is required to remediate the vulnerabilities. Refer to Red Hat's official advisory RHSA-2026:9835 and the update instructions at https://access.redhat.com/articles/11258 for detailed guidance.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:9835
- Cve Count
- 3
- Additional Cves
- ["CVE-2026-23204","CVE-2026-23231"]
- Cvss Version
- null
Threat ID: 6a27e9928dd33fbd851695b9
Added to database: 6/9/2026, 10:23:14 AM
Last enriched: 6/9/2026, 10:33:45 AM
Last updated: 6/10/2026, 6:18:12 AM
Views: 5
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