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
Red Hat has issued a security advisory (RHSA-2026:9513) for the Linux kernel packages in Red Hat Enterprise Linux 8.2 AUS addressing four vulnerabilities: CVE-2025-40064 (use-after-free in __pnet_find_base_ndev()), CVE-2025-40168 (improper use of __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match()), CVE-2026-23204 (use of skb_header_pointer_careful() in net/sched cls_u32), and CVE-2026-23231 (privilege escalation or denial of service via use-after-free in nf_tables_addchain()). These vulnerabilities affect kernel components related to networking and packet scheduling. Red Hat classifies the security impact as moderate and has released updated kernel packages to remediate these issues. The update requires a system reboot to take effect.
Potential Impact
The vulnerabilities include use-after-free conditions and improper pointer handling that could lead to privilege escalation or denial of service on affected systems running Red Hat Enterprise Linux 8.2 AUS. The issues impact kernel networking components and could allow attackers to exploit kernel memory management flaws. Red Hat rates the overall security impact as moderate. There are no known exploits in the wild at this time.
Mitigation Recommendations
Red Hat has released a security update for the Linux kernel packages in Red Hat Enterprise Linux 8.2 AUS that addresses these vulnerabilities. Users should apply the update as described in the Red Hat advisory RHSA-2026:9513 and reboot the system to ensure the fixes take effect. No additional mitigations are specified or required beyond applying the official update.
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
Red Hat has issued a security advisory (RHSA-2026:9513) for the Linux kernel packages in Red Hat Enterprise Linux 8.2 AUS addressing four vulnerabilities: CVE-2025-40064 (use-after-free in __pnet_find_base_ndev()), CVE-2025-40168 (improper use of __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match()), CVE-2026-23204 (use of skb_header_pointer_careful() in net/sched cls_u32), and CVE-2026-23231 (privilege escalation or denial of service via use-after-free in nf_tables_addchain()). These vulnerabilities affect kernel components related to networking and packet scheduling. Red Hat classifies the security impact as moderate and has released updated kernel packages to remediate these issues. The update requires a system reboot to take effect.
Potential Impact
The vulnerabilities include use-after-free conditions and improper pointer handling that could lead to privilege escalation or denial of service on affected systems running Red Hat Enterprise Linux 8.2 AUS. The issues impact kernel networking components and could allow attackers to exploit kernel memory management flaws. Red Hat rates the overall security impact as moderate. There are no known exploits in the wild at this time.
Mitigation Recommendations
Red Hat has released a security update for the Linux kernel packages in Red Hat Enterprise Linux 8.2 AUS that addresses these vulnerabilities. Users should apply the update as described in the Red Hat advisory RHSA-2026:9513 and reboot the system to ensure the fixes take effect. No additional mitigations are specified or required beyond applying the official update.
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: 6/9/2026, 10:25:01 AM
Last enriched: 6/9/2026, 10:27:08 AM
Last updated: 6/9/2026, 2:55:26 PM
Views: 6
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