CVE-2026-99031
Received
Received - Intake
Linux Kernel Stack Overflow in Bridge Multicast Handling
Vulnerability report for CVE-2026-99031, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-23
Last updated on: 2026-10-23
Assigner: kernel.org
Description
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.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | 8266a0491e92d39dc9af739e8380a0daa9b8836b |
| Linux | Linux | 8266a0491e92d39dc9af739e8380a0daa9b8836b |
| Linux | Linux | 8266a0491e92d39dc9af739e8380a0daa9b8836b |
| Linux | Linux | 8266a0491e92d39dc9af739e8380a0daa9b8836b |
| Linux | Linux | 8266a0491e92d39dc9af739e8380a0daa9b8836b |
| Linux | Linux | 5.10 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
