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: smb: client: fix use-after-free in cifs_oplock_break (CVE-2025-38527) * kernel: NFS: Fix filehandle bounds checking in nfs_fh_to_dentry() (CVE-2025-39730) 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 Red Hat security advisory (RHSA-2025:17397) addresses two kernel vulnerabilities in Red Hat Enterprise Linux 8. The first vulnerability (CVE-2025-38527) is a use-after-free in the SMB client code within the cifs_oplock_break function. The second vulnerability (CVE-2025-39730) involves improper filehandle bounds checking in the nfs_fh_to_dentry() function. Both issues could lead to memory corruption or other stability problems in the kernel. The advisory provides updated kernel packages that fix these flaws. A system reboot is required to apply the fixes. The advisory affects multiple Red Hat Enterprise Linux 8 variants and architectures. No CVSS scores are included, but Red Hat rates the impact as moderate.
Potential Impact
The vulnerabilities affect the Linux kernel, which is the core of the operating system. The use-after-free in the SMB client could lead to memory corruption, potentially impacting system stability or security. The NFS filehandle bounds checking flaw could also cause memory safety issues. Both vulnerabilities could be exploited to cause denial of service or other unintended behavior. However, no known exploits in the wild have been reported. The impact is rated moderate by Red Hat.
Mitigation Recommendations
Red Hat has released updated kernel packages that address these vulnerabilities. Users of Red Hat Enterprise Linux 8 should apply the kernel update as described in the Red Hat advisory RHSA-2025:17397. A system reboot is required for the update to 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: smb: client: fix use-after-free in cifs_oplock_break (CVE-2025-38527) * kernel: NFS: Fix filehandle bounds checking in nfs_fh_to_dentry() (CVE-2025-39730) 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
This Red Hat security advisory (RHSA-2025:17397) addresses two kernel vulnerabilities in Red Hat Enterprise Linux 8. The first vulnerability (CVE-2025-38527) is a use-after-free in the SMB client code within the cifs_oplock_break function. The second vulnerability (CVE-2025-39730) involves improper filehandle bounds checking in the nfs_fh_to_dentry() function. Both issues could lead to memory corruption or other stability problems in the kernel. The advisory provides updated kernel packages that fix these flaws. A system reboot is required to apply the fixes. The advisory affects multiple Red Hat Enterprise Linux 8 variants and architectures. No CVSS scores are included, but Red Hat rates the impact as moderate.
Potential Impact
The vulnerabilities affect the Linux kernel, which is the core of the operating system. The use-after-free in the SMB client could lead to memory corruption, potentially impacting system stability or security. The NFS filehandle bounds checking flaw could also cause memory safety issues. Both vulnerabilities could be exploited to cause denial of service or other unintended behavior. However, no known exploits in the wild have been reported. The impact is rated moderate by Red Hat.
Mitigation Recommendations
Red Hat has released updated kernel packages that address these vulnerabilities. Users of Red Hat Enterprise Linux 8 should apply the kernel update as described in the Red Hat advisory RHSA-2025:17397. A system reboot is required for the update to 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-2025:17397
- Cve Count
- 2
- Additional Cves
- ["CVE-2025-39730"]
- Cvss Version
- null
Threat ID: 6a3da1e24853345fc182c38f
Added to database: 06/25/2026, 21:47:14 UTC
Last enriched: 06/25/2026, 22:28:51 UTC
Last updated: 07/03/2026, 12:47:02 UTC
Views: 13
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