Answer in brief
CVE-2026-43088 records a Medium severity (CVSS 5.5) vulnerability in net: af_key: zero aligned sockaddr tail in PF_KEY exports. 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.
CVSS is 5.5. 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 | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3c19cb8a84ef709d57943bd6664cf31cb91ba6ec || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <11cbf294bac623bd57296f231199193087f57b4a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <edd446ee7cd3d02cac246168063d5b3e9ea68460 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2e74f974359b5382ecbe8536abbb5b837eb6c724 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <426c355742f02cf743b347d9d7dbdc1bfbfa31ef | 3c19cb8a84ef709d57943bd6664cf31cb91ba6ec, 11cbf294bac623bd57296f231199193087f57b4a, edd446ee7cd3d02cac246168063d5b3e9ea68460, 2e74f974359b5382ecbe8536abbb5b837eb6c724, 426c355742f02cf743b347d9d7dbdc1bfbfa31ef |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
Published upstream
May 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jun 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 19, 2026
In the Linux kernel, the following vulnerability has been resolved: net: af_key: zero aligned sockaddr tail in PF_KEY exports PF_KEY export paths use `pfkey_sockaddr_size()` when reserving sockaddr payload space, so IPv6 addresses occupy 32 bytes on the wire. However, `pfkey_sockaddr_fill()` initializes only the first 28 bytes of `struct sockaddr_in6`, leaving the final 4 aligned bytes uninitialized. Not every PF_KEY message is affected. The state and policy dump builders already zero the whole message buffer before filling the sockaddr payloads. Keep the fix to the export paths that still append aligned sockaddr payloads with plain `skb_put()`: - `SADB_ACQUIRE` - `SADB_X_NAT_T_NEW_MAPPING` - `SADB_X_MIGRATE` Fix those paths by clearing only the aligned sockaddr tail after `pfkey_sockaddr_fill()`.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-43088 records a Medium severity (CVSS 5.5) vulnerability in net: af_key: zero aligned sockaddr tail in PF_KEY exports. 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.
CVSS is 5.5. 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 | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3c19cb8a84ef709d57943bd6664cf31cb91ba6ec || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <11cbf294bac623bd57296f231199193087f57b4a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <edd446ee7cd3d02cac246168063d5b3e9ea68460 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2e74f974359b5382ecbe8536abbb5b837eb6c724 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <426c355742f02cf743b347d9d7dbdc1bfbfa31ef | 3c19cb8a84ef709d57943bd6664cf31cb91ba6ec, 11cbf294bac623bd57296f231199193087f57b4a, edd446ee7cd3d02cac246168063d5b3e9ea68460, 2e74f974359b5382ecbe8536abbb5b837eb6c724, 426c355742f02cf743b347d9d7dbdc1bfbfa31ef |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
Published upstream
May 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jun 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 19, 2026
In the Linux kernel, the following vulnerability has been resolved: net: af_key: zero aligned sockaddr tail in PF_KEY exports PF_KEY export paths use `pfkey_sockaddr_size()` when reserving sockaddr payload space, so IPv6 addresses occupy 32 bytes on the wire. However, `pfkey_sockaddr_fill()` initializes only the first 28 bytes of `struct sockaddr_in6`, leaving the final 4 aligned bytes uninitialized. Not every PF_KEY message is affected. The state and policy dump builders already zero the whole message buffer before filling the sockaddr payloads. Keep the fix to the export paths that still append aligned sockaddr payloads with plain `skb_put()`: - `SADB_ACQUIRE` - `SADB_X_NAT_T_NEW_MAPPING` - `SADB_X_MIGRATE` Fix those paths by clearing only the aligned sockaddr tail after `pfkey_sockaddr_fill()`.
Quoted source text, attributed separately from HOL analysis.