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: 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 two kernel vulnerabilities in Red Hat Enterprise Linux 8.8. CVE-2026-23204 fixes an issue in the net/sched cls_u32 component by using skb_header_pointer_careful(). CVE-2026-23231 addresses a use-after-free vulnerability in nf_tables_addchain that could allow privilege escalation or denial of service. Red Hat has released updated kernel packages to remediate these issues. The update must be installed and the system rebooted to apply the fixes.
Potential Impact
The vulnerabilities could allow an attacker to escalate privileges or cause a denial of service on affected systems running Red Hat Enterprise Linux 8.8. The kernel is a critical component, so these issues impact system security and stability. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Red Hat has released an official security update for the kernel packages in Red Hat Enterprise Linux 8.8 that addresses these vulnerabilities. Users should apply the update as described in the Red Hat advisory RHSA-2026:9515 and reboot their systems to ensure the fixes take effect. Patch status is confirmed as fixed in the updated kernel packages.
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: 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 two kernel vulnerabilities in Red Hat Enterprise Linux 8.8. CVE-2026-23204 fixes an issue in the net/sched cls_u32 component by using skb_header_pointer_careful(). CVE-2026-23231 addresses a use-after-free vulnerability in nf_tables_addchain that could allow privilege escalation or denial of service. Red Hat has released updated kernel packages to remediate these issues. The update must be installed and the system rebooted to apply the fixes.
Potential Impact
The vulnerabilities could allow an attacker to escalate privileges or cause a denial of service on affected systems running Red Hat Enterprise Linux 8.8. The kernel is a critical component, so these issues impact system security and stability. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Red Hat has released an official security update for the kernel packages in Red Hat Enterprise Linux 8.8 that addresses these vulnerabilities. Users should apply the update as described in the Red Hat advisory RHSA-2026:9515 and reboot their systems to ensure the fixes take effect. Patch status is confirmed as fixed in the updated kernel packages.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:9515
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-23231"]
- Cvss Version
- null
Threat ID: 6a27e9fd8dd33fbd8517cfb2
Added to database: 6/9/2026, 10:25:01 AM
Last enriched: 6/9/2026, 10:27:13 AM
Last updated: 6/10/2026, 5:07:04 AM
Views: 8
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.