CVE-2026-99031
In the Linux kernel, the following vulnerability has been resolved: net: bridge: avoid recursive multicast port cleanup br_multicast_sg_del_exclude_ports() removes automatically added STAR_EXCL port groups by calling br_multicast_del_pg(). For S,G entries, that deletion calls back into br_multicast_sg_del_exclude_ports(), so a large number of STAR_EXCL ports consumes one kernel stack frame per port and can hit the stack guard page. Keep the complete port-group deletion path for cleanup, but suppress the S,G exclude-port cleanup while that helper is already walking the same entry. Normal deletion callers retain the existing behavior.
Affected versions
Linux kernel versions
5.10
and later are affected. Fixed in
6.6.160,
6.12.113,
6.18.57,
7.2.11,
7.3
and their respective stable series.
References
5 totalFrequently asked questions
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What is CVE-2026-99031?
CVE-2026-99031 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.10 onward and has been patched in 6.6.160, 6.12.113, 6.18.57 and others. CVE-2026-99031 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-99031?
Yes. CVE-2026-99031 has been patched. Fixed versions include 6.6.160, 6.12.113, 6.18.57 and others. If you are running Linux kernel 5.10 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-99031 actively exploited?
No. CVE-2026-99031 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.