Answer in brief
CVE-2026-74480 records a Critical severity (CVSS 9.8) vulnerability in net: bridge: stop fast-leave after deleting a port group. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=6db6f0eae6052b70885562e1733896647ec1d807 <159ad90cb929c033308bb39a2c5f8fbf393b77aa || >=6db6f0eae6052b70885562e1733896647ec1d807 <4695430e8132420bf8de94da3eb36a6cf35fde6b || >=6db6f0eae6052b70885562e1733896647ec1d807 <0309ebbc570000ea0df11c06b69798e5860c5f6f || >=6db6f0eae6052b70885562e1733896647ec1d807 <4c57056ca6aace2e9f94ae9298bf49ef6b0c95e4 || >=6db6f0eae6052b70885562e1733896647ec1d807 <a39789f211b8a4125f0c70e05b30cf715f4f187d | 159ad90cb929c033308bb39a2c5f8fbf393b77aa, 4695430e8132420bf8de94da3eb36a6cf35fde6b, 0309ebbc570000ea0df11c06b69798e5860c5f6f, 4c57056ca6aace2e9f94ae9298bf49ef6b0c95e4, a39789f211b8a4125f0c70e05b30cf715f4f187d |
| Linux/Linuxgeneric | 4.11 | Not reported |
| Linux/Linuxgeneric | >=6db6f0eae6052b70885562e1733896647ec1d807 <d6c32e2e25a9a06ba021030e26b6d602a277eb72 || >=6db6f0eae6052b70885562e1733896647ec1d807 <482bcb85139addb4e8ac8ed10baeda3e0aad4031 || >=6db6f0eae6052b70885562e1733896647ec1d807 <1a109cc9890d017c41d77e6c82da739579c49f0b || >=6db6f0eae6052b70885562e1733896647ec1d807 <159ad90cb929c033308bb39a2c5f8fbf393b77aa || >=6db6f0eae6052b70885562e1733896647ec1d807 <4695430e8132420bf8de94da3eb36a6cf35fde6b || >=6db6f0eae6052b70885562e1733896647ec1d807 <0309ebbc570000ea0df11c06b69798e5860c5f6f || >=6db6f0eae6052b70885562e1733896647ec1d807 <4c57056ca6aace2e9f94ae9298bf49ef6b0c95e4 || >=6db6f0eae6052b70885562e1733896647ec1d807 <a39789f211b8a4125f0c70e05b30cf715f4f187d | d6c32e2e25a9a06ba021030e26b6d602a277eb72, 482bcb85139addb4e8ac8ed10baeda3e0aad4031, 1a109cc9890d017c41d77e6c82da739579c49f0b, 159ad90cb929c033308bb39a2c5f8fbf393b77aa, 4695430e8132420bf8de94da3eb36a6cf35fde6b, 0309ebbc570000ea0df11c06b69798e5860c5f6f, 4c57056ca6aace2e9f94ae9298bf49ef6b0c95e4, a39789f211b8a4125f0c70e05b30cf715f4f187d |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
In the Linux kernel, the following vulnerability has been resolved: net: bridge: stop fast-leave after deleting a port group br_multicast_leave_group() iterates mp->ports with pp = &p->next in its fast-leave path. After br_multicast_del_pg() removes p, continuing the loop advances pp through the deleted entry. If multicast-to-unicast was enabled, the bridge can hold multiple port groups for the same port and group with different source MAC addresses. Once multicast-to-unicast is disabled, br_port_group_equal() matches those entries by port only. A fast leave can then delete one entry and continue from its stale next pointer, leaving mp->ports pointing at a deleted port group. Fast leave only needs to remove one matching port group. Break after br_multicast_del_pg() so the loop stops before dereferencing the removed entry.
Quoted source text, attributed separately from HOL analysis.