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CVE-2026-99031

UnknownEPSS 0.17%

Last modified

CVE-2026-99031 is a vulnerability of currently unknown severity. 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. EPSS estimates a 0.17% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability
0.17%

6.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 8266a0491e92d39dc9af739e8380a0daa9b8836b, < 0ed8edcbcf2290dba13c1beeba27fc19ad38515b; >= 8266a0491e92d39dc9af739e8380a0daa9b8836b, < 6a7385f6605958aa69eeb185c91f45d77640d1e2; >= 8266a0491e92d39dc9af739e8380a0daa9b8836b, < 26142868b0767e95e28b7a1237f58b292b54d1d9; >= 8266a0491e92d39dc9af739e8380a0daa9b8836b, < 695a5a4c69c922d9296b2d7ad5f1ce8c6858fc64; >= 8266a0491e92d39dc9af739e8380a0daa9b8836b, < 2fb87c6025f90191516bee3ce14b42eb3e1cfed7; >= 8266a0491e92d39dc9af739e8380a0daa9b8836b, < d109141ba14652146089ef78b32d5e4d5285ebad; >= 8266a0491e92d39dc9af739e8380a0daa9b8836b, < 7931fb9181421953f3133b408b0f2e2b8dd68b61; >= 8266a0491e92d39dc9af739e8380a0daa9b8836b, < 5158353121bae4f552cb677ce8c5c3ef52f93a0d
LinuxLinux5.10

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is 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.
How severe is CVE-2026-99031?
Severity scoring for CVE-2026-99031 is pending analysis. The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.
How do I fix CVE-2026-99031?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST