Red Hat Security Advisory: kernel-rt security update
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix(es): * kernel: ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr() (CVE-2025-71085) * kernel: macvlan: fix possible UAF in macvlan_forward_source() (CVE-2026-23001) 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 Red Hat security advisory RHSA-2026:3963 addresses two vulnerabilities in the kernel-rt packages for Red Hat Enterprise Linux 8. CVE-2025-71085 is a BUG() triggered in the IPv6 code path within pskb_expand_head() as part of calipso_skbuff_setattr(). CVE-2026-23001 is a potential use-after-free vulnerability in the macvlan driver's macvlan_forward_source() function. Both issues could lead to kernel instability or memory corruption. The advisory provides updated kernel packages that fix these vulnerabilities. The update requires a system reboot to take effect.
Potential Impact
The vulnerabilities could cause kernel crashes or memory corruption due to a BUG() in IPv6 packet processing and a use-after-free in the macvlan network driver. This may affect system stability and security on affected Red Hat Enterprise Linux 8 systems. No known exploits in the wild have been reported. The overall security impact is rated as moderate by Red Hat.
Mitigation Recommendations
Red Hat has released updated kernel packages for Red Hat Enterprise Linux 8 that address these vulnerabilities. Users should apply the kernel update as described in the Red Hat advisory (https://access.redhat.com/articles/11258) and reboot affected systems to ensure the fixes take effect.
Red Hat Security Advisory: kernel-rt security update
Description
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix(es): * kernel: ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr() (CVE-2025-71085) * kernel: macvlan: fix possible UAF in macvlan_forward_source() (CVE-2026-23001) 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 Red Hat security advisory RHSA-2026:3963 addresses two vulnerabilities in the kernel-rt packages for Red Hat Enterprise Linux 8. CVE-2025-71085 is a BUG() triggered in the IPv6 code path within pskb_expand_head() as part of calipso_skbuff_setattr(). CVE-2026-23001 is a potential use-after-free vulnerability in the macvlan driver's macvlan_forward_source() function. Both issues could lead to kernel instability or memory corruption. The advisory provides updated kernel packages that fix these vulnerabilities. The update requires a system reboot to take effect.
Potential Impact
The vulnerabilities could cause kernel crashes or memory corruption due to a BUG() in IPv6 packet processing and a use-after-free in the macvlan network driver. This may affect system stability and security on affected Red Hat Enterprise Linux 8 systems. No known exploits in the wild have been reported. The overall security impact is rated as moderate by Red Hat.
Mitigation Recommendations
Red Hat has released updated kernel packages for Red Hat Enterprise Linux 8 that address these vulnerabilities. Users should apply the kernel update as described in the Red Hat advisory (https://access.redhat.com/articles/11258) and reboot affected systems to ensure the fixes take effect.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:3964
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-23001"]
- Cvss Version
- null
Threat ID: 6a2d2f88e617e2d834b6e539
Added to database: 06/13/2026, 10:23:04 UTC
Last enriched: 07/12/2026, 10:47:07 UTC
Last updated: 07/31/2026, 19:24:48 UTC
Views: 113
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