CVE-2026-99031

net: bridge: avoid recursive multicast port cleanup

State: Published
Severity: Not scored
Published: Oct 23, 2026
Updated: Oct 30, 2026
Reserved: Sep 25, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	8266a0491e92d39dc9af739e8380a0daa9b8836b to before 0ed8edcbcf2290dba13c1beeba27fc19ad38515bAffected 8266a0491e92d39dc9af739e8380a0daa9b8836b to before 6a7385f6605958aa69eeb185c91f45d77640d1e2Affected 8266a0491e92d39dc9af739e8380a0daa9b8836b to before 26142868b0767e95e28b7a1237f58b292b54d1d9Affected 8266a0491e92d39dc9af739e8380a0daa9b8836b to before 695a5a4c69c922d9296b2d7ad5f1ce8c6858fc64Affected 8266a0491e92d39dc9af739e8380a0daa9b8836b to before 2fb87c6025f90191516bee3ce14b42eb3e1cfed7Affected 8266a0491e92d39dc9af739e8380a0daa9b8836b to before d109141ba14652146089ef78b32d5e4d5285ebadAffected 8266a0491e92d39dc9af739e8380a0daa9b8836b to before 7931fb9181421953f3133b408b0f2e2b8dd68b61Affected 8266a0491e92d39dc9af739e8380a0daa9b8836b to before 5158353121bae4f552cb677ce8c5c3ef52f93a0dAffected
LinuxLinux	5.10Affected before 5.10Not affected 5.10.273 through 5.10.Not affected 5.15.224 through 5.15.Not affected 6.1.191 through 6.1.Not affected 6.6.160 through 6.6.Not affected 6.12.113 through 6.12.Not affected 6.18.57 through 6.18.Not affected 7.2.11 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

8266a0491e92d39dc9af739e8380a0daa9b8836b to before 0ed8edcbcf2290dba13c1beeba27fc19ad38515bAffected
8266a0491e92d39dc9af739e8380a0daa9b8836b to before 6a7385f6605958aa69eeb185c91f45d77640d1e2Affected
8266a0491e92d39dc9af739e8380a0daa9b8836b to before 26142868b0767e95e28b7a1237f58b292b54d1d9Affected
8266a0491e92d39dc9af739e8380a0daa9b8836b to before 695a5a4c69c922d9296b2d7ad5f1ce8c6858fc64Affected
8266a0491e92d39dc9af739e8380a0daa9b8836b to before 2fb87c6025f90191516bee3ce14b42eb3e1cfed7Affected
8266a0491e92d39dc9af739e8380a0daa9b8836b to before d109141ba14652146089ef78b32d5e4d5285ebadAffected
8266a0491e92d39dc9af739e8380a0daa9b8836b to before 7931fb9181421953f3133b408b0f2e2b8dd68b61Affected
8266a0491e92d39dc9af739e8380a0daa9b8836b to before 5158353121bae4f552cb677ce8c5c3ef52f93a0dAffected

LinuxLinux

5.10Affected
before 5.10Not affected
5.10.273 through 5.10.*Not affected
5.15.224 through 5.15.*Not affected
6.1.191 through 6.1.*Not affected
6.6.160 through 6.6.*Not affected
6.12.113 through 6.12.*Not affected
6.18.57 through 6.18.*Not affected
7.2.11 through 7.2.*Not affected
7.3 and laterNot affected

References

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