Answer in brief
CVE-2026-74480 records a Unknown severity 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). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. 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). 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 |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 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.
Answer in brief
CVE-2026-74480 records a Unknown severity 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). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. 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). 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 |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 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.