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: smc: Fix use-after-free in __pnet_find_base_ndev() (CVE-2025-40064) * kernel: smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match() (CVE-2025-40168) * 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
The advisory covers a kernel update for Red Hat Enterprise Linux 9.6 EUS that resolves multiple security vulnerabilities. Key fixes include a use-after-free in __pnet_find_base_ndev() (CVE-2025-40064), use-after-free in net/gro due to improper zerocopy skb handling (CVE-2026-46323), denial of service in libceph OSD client (CVE-2026-23136), and several other issues affecting netfilter, xfs, memory management, RDMA, and wifi subsystems. The update also addresses related bug fixes and performance improvements. The vendor rates the update as Important and requires a system reboot to apply the fixes.
Potential Impact
The vulnerabilities fixed include use-after-free conditions that could lead to memory corruption, denial of service in storage client components, and unsafe access to kernel data structures. These issues could potentially affect system stability and security by allowing attackers to cause crashes or execute unauthorized code. The advisory does not report known exploits in the wild. The update mitigates these risks by correcting the kernel code to safely handle affected operations.
Mitigation Recommendations
Red Hat has released an official kernel update for Red Hat Enterprise Linux 9.6 Extended Update Support that addresses these vulnerabilities. Users should apply the update promptly and reboot affected systems to ensure the fixes take effect. No additional mitigations are indicated by 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: smc: Fix use-after-free in __pnet_find_base_ndev() (CVE-2025-40064) * kernel: smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match() (CVE-2025-40168) * 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.
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The advisory covers a kernel update for Red Hat Enterprise Linux 9.6 EUS that resolves multiple security vulnerabilities. Key fixes include a use-after-free in __pnet_find_base_ndev() (CVE-2025-40064), use-after-free in net/gro due to improper zerocopy skb handling (CVE-2026-46323), denial of service in libceph OSD client (CVE-2026-23136), and several other issues affecting netfilter, xfs, memory management, RDMA, and wifi subsystems. The update also addresses related bug fixes and performance improvements. The vendor rates the update as Important and requires a system reboot to apply the fixes.
Potential Impact
The vulnerabilities fixed include use-after-free conditions that could lead to memory corruption, denial of service in storage client components, and unsafe access to kernel data structures. These issues could potentially affect system stability and security by allowing attackers to cause crashes or execute unauthorized code. The advisory does not report known exploits in the wild. The update mitigates these risks by correcting the kernel code to safely handle affected operations.
Mitigation Recommendations
Red Hat has released an official kernel update for Red Hat Enterprise Linux 9.6 Extended Update Support that addresses these vulnerabilities. Users should apply the update promptly and reboot affected systems to ensure the fixes take effect. No additional mitigations are indicated by 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-2026:9513
- Cve Count
- 4
- Additional Cves
- ["CVE-2025-40168","CVE-2026-23204","CVE-2026-23231"]
- Cvss Version
- null
Threat ID: 6a27e9fd8dd33fbd8517cfb9
Added to database: 06/09/2026, 10:25:01 UTC
Last enriched: 07/30/2026, 15:04:16 UTC
Last updated: 07/31/2026, 19:24:46 UTC
Views: 76
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