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: ipv6: sr: Fix MAC comparison to be constant-time (CVE-2025-39702) * kernel: kernfs: Fix UAF in polling when open file is released (CVE-2025-39881) 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 Product Security issued an advisory (RHSA-2025:19469) for a kernel security update affecting Red Hat Enterprise Linux 10. It addresses two vulnerabilities: CVE-2025-39702, which fixes a constant-time MAC comparison in IPv6 Segment Routing to prevent timing attacks, and CVE-2025-39881, which fixes a use-after-free vulnerability in kernfs polling related to file release. The advisory includes updated kernel packages and requires a reboot to apply the fixes. The update is rated moderate in severity and affects multiple architectures and variants of Red Hat Enterprise Linux 10 and CodeReady Linux Builder 10. No CVSS scores are provided in the advisory; users are directed to CVE pages for detailed scoring.
Potential Impact
The vulnerabilities could allow attackers to exploit timing side-channel information leakage (CVE-2025-39702) and use-after-free conditions (CVE-2025-39881) in the Linux kernel, potentially leading to information disclosure or system instability. Red Hat rates the overall impact as moderate. There are no known exploits in the wild at the time of the advisory.
Mitigation Recommendations
Red Hat has released updated kernel packages that fix these vulnerabilities. Users should apply the security update as detailed in the Red Hat advisory RHSA-2025:19469 and reboot their systems to ensure the fixes take effect. No additional mitigation steps are indicated or required 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: ipv6: sr: Fix MAC comparison to be constant-time (CVE-2025-39702) * kernel: kernfs: Fix UAF in polling when open file is released (CVE-2025-39881) 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
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Red Hat Product Security issued an advisory (RHSA-2025:19469) for a kernel security update affecting Red Hat Enterprise Linux 10. It addresses two vulnerabilities: CVE-2025-39702, which fixes a constant-time MAC comparison in IPv6 Segment Routing to prevent timing attacks, and CVE-2025-39881, which fixes a use-after-free vulnerability in kernfs polling related to file release. The advisory includes updated kernel packages and requires a reboot to apply the fixes. The update is rated moderate in severity and affects multiple architectures and variants of Red Hat Enterprise Linux 10 and CodeReady Linux Builder 10. No CVSS scores are provided in the advisory; users are directed to CVE pages for detailed scoring.
Potential Impact
The vulnerabilities could allow attackers to exploit timing side-channel information leakage (CVE-2025-39702) and use-after-free conditions (CVE-2025-39881) in the Linux kernel, potentially leading to information disclosure or system instability. Red Hat rates the overall impact as moderate. There are no known exploits in the wild at the time of the advisory.
Mitigation Recommendations
Red Hat has released updated kernel packages that fix these vulnerabilities. Users should apply the security update as detailed in the Red Hat advisory RHSA-2025:19469 and reboot their systems to ensure the fixes take effect. No additional mitigation steps are indicated or required 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-2025:19469
- Cve Count
- 2
- Additional Cves
- ["CVE-2025-39881"]
- Cvss Version
- null
Threat ID: 6a3da1df4853345fc182b3e6
Added to database: 06/25/2026, 21:47:11 UTC
Last enriched: 06/25/2026, 22:25:44 UTC
Last updated: 07/02/2026, 20:51:16 UTC
Views: 14
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