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: media: rc: fix races with imon_disconnect() (CVE-2025-39993) * kernel: sctp: avoid NULL dereference when chunk data buffer is missing (CVE-2025-40240) * kernel: libceph: fix potential use-after-free in have_mon_and_osd_map() (CVE-2025-68285) 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 advisory covers three kernel vulnerabilities: a race condition in the media remote control subsystem related to imon_disconnect() (CVE-2025-39993), a NULL dereference in SCTP when chunk data buffer is missing (CVE-2025-40240), and a potential use-after-free in the libceph component (CVE-2025-68285). These flaws could lead to system instability or crashes. Red Hat has released updated kernel packages for Red Hat Enterprise Linux 8 and related variants to fix these issues. The update requires rebooting affected systems to take effect.
Potential Impact
The vulnerabilities could cause kernel crashes or undefined behavior due to race conditions, NULL pointer dereferences, or use-after-free bugs in critical kernel components. This may impact system stability and reliability. No known exploits in the wild have been reported. The security impact is rated as important by Red Hat.
Mitigation Recommendations
Red Hat has released updated kernel packages that fix these vulnerabilities. Users should apply the security update as described in the Red Hat advisory RHSA-2026:0444 and reboot their systems to ensure the fixes 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: media: rc: fix races with imon_disconnect() (CVE-2025-39993) * kernel: sctp: avoid NULL dereference when chunk data buffer is missing (CVE-2025-40240) * kernel: libceph: fix potential use-after-free in have_mon_and_osd_map() (CVE-2025-68285) 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 advisory covers three kernel vulnerabilities: a race condition in the media remote control subsystem related to imon_disconnect() (CVE-2025-39993), a NULL dereference in SCTP when chunk data buffer is missing (CVE-2025-40240), and a potential use-after-free in the libceph component (CVE-2025-68285). These flaws could lead to system instability or crashes. Red Hat has released updated kernel packages for Red Hat Enterprise Linux 8 and related variants to fix these issues. The update requires rebooting affected systems to take effect.
Potential Impact
The vulnerabilities could cause kernel crashes or undefined behavior due to race conditions, NULL pointer dereferences, or use-after-free bugs in critical kernel components. This may impact system stability and reliability. No known exploits in the wild have been reported. The security impact is rated as important by Red Hat.
Mitigation Recommendations
Red Hat has released updated kernel packages that fix these vulnerabilities. Users should apply the security update as described in the Red Hat advisory RHSA-2026:0444 and reboot their systems to ensure the fixes 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-2026:0444
- Cve Count
- 3
- Additional Cves
- ["CVE-2025-40240","CVE-2025-68285"]
- Cvss Version
- null
Threat ID: 6a3da1cb4853345fc18229ee
Added to database: 06/25/2026, 21:46:51 UTC
Last enriched: 06/25/2026, 22:03:38 UTC
Last updated: 06/29/2026, 12:51:13 UTC
Views: 6
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