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: Make cake_enqueue return NET_XMIT_CN when past buffer_limit (CVE-2025-39766) * kernel: scsi: qla2xxx: Fix improper freeing of purex item (CVE-2025-68741) 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 kernel security update fixes two vulnerabilities in the Linux kernel for Red Hat Enterprise Linux 9. CVE-2025-39766 addresses an issue in the net/sched subsystem where cake_enqueue did not return NET_XMIT_CN when past the buffer limit, potentially causing improper network packet handling. CVE-2025-68741 fixes improper freeing of a purex item in the scsi qla2xxx driver, which could lead to memory management issues. These fixes are included in updated kernel packages that must be installed and followed by a system reboot to take effect.
Potential Impact
The vulnerabilities affect the Linux kernel core components, potentially impacting system stability and security related to network packet scheduling and SCSI device handling. The advisory rates the security impact as Important (high severity). No known exploits in the wild have been reported. The issues could lead to improper resource handling or denial of service conditions if exploited.
Mitigation Recommendations
Red Hat has released updated kernel packages that address these vulnerabilities. Users should apply the security update as described in the Red Hat advisory (RHSA-2026:8921) and reboot affected systems to ensure the fixes take effect. No additional mitigation steps are indicated 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: net/sched: Make cake_enqueue return NET_XMIT_CN when past buffer_limit (CVE-2025-39766) * kernel: scsi: qla2xxx: Fix improper freeing of purex item (CVE-2025-68741) 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 kernel security update fixes two vulnerabilities in the Linux kernel for Red Hat Enterprise Linux 9. CVE-2025-39766 addresses an issue in the net/sched subsystem where cake_enqueue did not return NET_XMIT_CN when past the buffer limit, potentially causing improper network packet handling. CVE-2025-68741 fixes improper freeing of a purex item in the scsi qla2xxx driver, which could lead to memory management issues. These fixes are included in updated kernel packages that must be installed and followed by a system reboot to take effect.
Potential Impact
The vulnerabilities affect the Linux kernel core components, potentially impacting system stability and security related to network packet scheduling and SCSI device handling. The advisory rates the security impact as Important (high severity). No known exploits in the wild have been reported. The issues could lead to improper resource handling or denial of service conditions if exploited.
Mitigation Recommendations
Red Hat has released updated kernel packages that address these vulnerabilities. Users should apply the security update as described in the Red Hat advisory (RHSA-2026:8921) and reboot affected systems to ensure the fixes take effect. No additional mitigation steps are indicated 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-2026:8921
- Cve Count
- 2
- Additional Cves
- ["CVE-2025-68741"]
- Cvss Version
- null
Threat ID: 6a175eede29bf47b50edbbb1
Added to database: 05/27/2026, 21:15:25 UTC
Last enriched: 06/25/2026, 23:04:09 UTC
Last updated: 07/31/2026, 19:22:54 UTC
Views: 87
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