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: Linux kernel: Use-after-free in traffic control (act_ct) may lead to denial of service or privilege escalation (CVE-2026-23270) * kernel: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache (CVE-2026-31402) * kernel: Linux kernel: Use-after-free in bonding driver leads to denial of service (CVE-2026-31419) * kernel: crypto: algif_aead - Revert to operating out-of-place (CVE-2026-31431) 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-2026:35863) details an important update to the Linux kernel packages in Red Hat Enterprise Linux 8.8 addressing multiple security vulnerabilities. The key security fixes include a use-after-free vulnerability in the traffic control act_ct module (CVE-2026-23270) that could allow denial of service or privilege escalation. Additional vulnerabilities fixed involve zero-length checks in netfilter's nf_conntrack_h323 (CVE-2026-23455), slab-use-after-free in multipath TCP (__inet_lookup_established, CVE-2026-31669), out-of-bounds write checks in ALSA USB audio (CVE-2026-43279), race conditions in TCP IPv6 SYN receive socket (CVE-2026-43198), length validation in distributed lock manager (CVE-2026-43125), maximum action checks in netfilter flowtable (CVE-2026-43329), use-after-free in ALSA aloop (CVE-2026-46090), double free in RDMA rxe_srq_from_init (CVE-2026-45852), and misuse of RCU in RDMA mlx4_srq_event (CVE-2026-46181). The advisory also includes bug fixes and enhancements such as preventing panics during NVMe controller reset tests. The update requires a system reboot to apply the fixes. The advisory references multiple CVEs and provides links to Red Hat's errata and update instructions.
Potential Impact
The vulnerabilities fixed in this advisory affect the Linux kernel core of Red Hat Enterprise Linux 8.8, potentially allowing denial of service or privilege escalation attacks via use-after-free and other memory corruption issues. The impact includes possible system crashes, unauthorized privilege gains, and instability in kernel subsystems such as networking, audio, and RDMA. The update mitigates these risks by correcting memory handling, input validation, and race conditions in affected kernel components.
Mitigation Recommendations
Red Hat has released an official kernel update for Red Hat Enterprise Linux 8.8 that addresses these vulnerabilities. Users should apply the update promptly following Red Hat's guidance at https://access.redhat.com/articles/11258 and reboot affected systems to ensure the fixes take effect. No additional mitigation steps are required beyond applying the official patch and rebooting.
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: Linux kernel: Use-after-free in traffic control (act_ct) may lead to denial of service or privilege escalation (CVE-2026-23270) * kernel: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache (CVE-2026-31402) * kernel: Linux kernel: Use-after-free in bonding driver leads to denial of service (CVE-2026-31419) * kernel: crypto: algif_aead - Revert to operating out-of-place (CVE-2026-31431) 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
This Red Hat security advisory (RHSA-2026:35863) details an important update to the Linux kernel packages in Red Hat Enterprise Linux 8.8 addressing multiple security vulnerabilities. The key security fixes include a use-after-free vulnerability in the traffic control act_ct module (CVE-2026-23270) that could allow denial of service or privilege escalation. Additional vulnerabilities fixed involve zero-length checks in netfilter's nf_conntrack_h323 (CVE-2026-23455), slab-use-after-free in multipath TCP (__inet_lookup_established, CVE-2026-31669), out-of-bounds write checks in ALSA USB audio (CVE-2026-43279), race conditions in TCP IPv6 SYN receive socket (CVE-2026-43198), length validation in distributed lock manager (CVE-2026-43125), maximum action checks in netfilter flowtable (CVE-2026-43329), use-after-free in ALSA aloop (CVE-2026-46090), double free in RDMA rxe_srq_from_init (CVE-2026-45852), and misuse of RCU in RDMA mlx4_srq_event (CVE-2026-46181). The advisory also includes bug fixes and enhancements such as preventing panics during NVMe controller reset tests. The update requires a system reboot to apply the fixes. The advisory references multiple CVEs and provides links to Red Hat's errata and update instructions.
Potential Impact
The vulnerabilities fixed in this advisory affect the Linux kernel core of Red Hat Enterprise Linux 8.8, potentially allowing denial of service or privilege escalation attacks via use-after-free and other memory corruption issues. The impact includes possible system crashes, unauthorized privilege gains, and instability in kernel subsystems such as networking, audio, and RDMA. The update mitigates these risks by correcting memory handling, input validation, and race conditions in affected kernel components.
Mitigation Recommendations
Red Hat has released an official kernel update for Red Hat Enterprise Linux 8.8 that addresses these vulnerabilities. Users should apply the update promptly following Red Hat's guidance at https://access.redhat.com/articles/11258 and reboot affected systems to ensure the fixes take effect. No additional mitigation steps are required beyond applying the official patch 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-2026:13566
- Cve Count
- 5
- Additional Cves
- ["CVE-2026-31402","CVE-2026-31419","CVE-2026-31431","CVE-2026-43077"]
Threat ID: 6a160977e29bf47b50643216
Added to database: 05/26/2026, 20:58:31 UTC
Last enriched: 07/30/2026, 15:03:36 UTC
Last updated: 09/14/2026, 22:01:32 UTC
Views: 141
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