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: openvswitch: Avoid releasing netdev before teardown completes (CVE-2026-31508) * kernel: netfilter: xt_tcpmss: check remaining length before reading optlen (CVE-2026-43190) 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
Two vulnerabilities in the Linux kernel shipped with Red Hat Enterprise Linux 9.4 are addressed. CVE-2026-31508 fixes a flaw in the openvswitch networking code where the network device could be released prematurely before teardown completes, potentially causing use-after-free or race conditions. CVE-2026-43190 fixes an issue in the netfilter xt_tcpmss module where the remaining length was not checked before reading the option length, which could lead to out-of-bounds reads. Red Hat has issued a security advisory (RHSA-2026:25028) with updated kernel packages that resolve these issues. The update requires rebooting the system to take effect.
Potential Impact
The vulnerabilities affect the Linux kernel core in Red Hat Enterprise Linux 9.4 variants. They may allow an attacker to cause kernel instability or crashes due to improper handling of network device teardown and malformed netfilter options. The advisory rates the impact as moderate. There are no known exploits in the wild at this time.
Mitigation Recommendations
Red Hat has released updated kernel packages that fix these vulnerabilities. Users should apply the kernel update provided in advisory RHSA-2026:25028 and reboot their systems to activate the fixes. For detailed update instructions, refer to https://access.redhat.com/articles/11258. No additional mitigations are specified 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: net: openvswitch: Avoid releasing netdev before teardown completes (CVE-2026-31508) * kernel: netfilter: xt_tcpmss: check remaining length before reading optlen (CVE-2026-43190) 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
Two vulnerabilities in the Linux kernel shipped with Red Hat Enterprise Linux 9.4 are addressed. CVE-2026-31508 fixes a flaw in the openvswitch networking code where the network device could be released prematurely before teardown completes, potentially causing use-after-free or race conditions. CVE-2026-43190 fixes an issue in the netfilter xt_tcpmss module where the remaining length was not checked before reading the option length, which could lead to out-of-bounds reads. Red Hat has issued a security advisory (RHSA-2026:25028) with updated kernel packages that resolve these issues. The update requires rebooting the system to take effect.
Potential Impact
The vulnerabilities affect the Linux kernel core in Red Hat Enterprise Linux 9.4 variants. They may allow an attacker to cause kernel instability or crashes due to improper handling of network device teardown and malformed netfilter options. The advisory rates the impact as moderate. There are no known exploits in the wild at this time.
Mitigation Recommendations
Red Hat has released updated kernel packages that fix these vulnerabilities. Users should apply the kernel update provided in advisory RHSA-2026:25028 and reboot their systems to activate the fixes. For detailed update instructions, refer to https://access.redhat.com/articles/11258. No additional mitigations are specified 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-2026:25028
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-43190"]
- Cvss Version
- null
Threat ID: 6a2f1a511cccde5f2636f008
Added to database: 06/14/2026, 21:17:05 UTC
Last enriched: 07/08/2026, 14:03:36 UTC
Last updated: 07/31/2026, 19:24:48 UTC
Views: 346
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