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 four kernel vulnerabilities: CVE-2025-40064 fixes a use-after-free in __pnet_find_base_ndev() within the smc subsystem; CVE-2025-40168 addresses pointer handling in smc_clc_prfx_match(); CVE-2026-23204 corrects skb_header_pointer usage in net/sched cls_u32; and CVE-2026-23231 mitigates privilege escalation or denial of service via use-after-free in nf_tables_addchain(). These vulnerabilities affect the Linux kernel core in Red Hat Enterprise Linux 8.6 variants. The advisory provides updated kernel packages that fix these issues, requiring a reboot to activate the patches.
Potential Impact
The vulnerabilities could lead to use-after-free conditions causing potential privilege escalation or denial of service on affected systems. The overall security impact is rated moderate by Red Hat. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Red Hat has released updated kernel packages addressing these vulnerabilities. Users should apply the security update for Red Hat Enterprise Linux 8.6 as described in the advisory RHSA-2026:9514 and reboot the system to ensure the fixes take effect. Patch status is confirmed by the vendor advisory. No additional mitigation steps are indicated beyond applying the official update 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: 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-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The advisory covers four kernel vulnerabilities: CVE-2025-40064 fixes a use-after-free in __pnet_find_base_ndev() within the smc subsystem; CVE-2025-40168 addresses pointer handling in smc_clc_prfx_match(); CVE-2026-23204 corrects skb_header_pointer usage in net/sched cls_u32; and CVE-2026-23231 mitigates privilege escalation or denial of service via use-after-free in nf_tables_addchain(). These vulnerabilities affect the Linux kernel core in Red Hat Enterprise Linux 8.6 variants. The advisory provides updated kernel packages that fix these issues, requiring a reboot to activate the patches.
Potential Impact
The vulnerabilities could lead to use-after-free conditions causing potential privilege escalation or denial of service on affected systems. The overall security impact is rated moderate by Red Hat. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Red Hat has released updated kernel packages addressing these vulnerabilities. Users should apply the security update for Red Hat Enterprise Linux 8.6 as described in the advisory RHSA-2026:9514 and reboot the system to ensure the fixes take effect. Patch status is confirmed by the vendor advisory. No additional mitigation steps are indicated beyond applying the official 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-2026:9514
- Cve Count
- 4
- Additional Cves
- ["CVE-2025-40168","CVE-2026-23204","CVE-2026-23231"]
- Cvss Version
- null
Threat ID: 6a27e9f98dd33fbd8517c171
Added to database: 6/9/2026, 10:24:57 AM
Last enriched: 6/9/2026, 10:27:41 AM
Last updated: 6/10/2026, 6:39:26 AM
Views: 7
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