Answer in brief
CVE-2026-80521 records a High severity (CVSS 7.8) vulnerability in af_unix: Unlink scc_entry in unix_del_edge().. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), 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 7.8. 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), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | 6.10 | Not reported |
| Linux/Linuxgeneric | >=5dfd283f4651d04dbb70ceb9ae5c4a30eda3c52a <2b6c2842692d08e7acaf32d1eb47f95def35f3fe || >=de7921631ff323369aa63a4324695ab54ea4047e <6fda5c51b8e43a8440f76e65c89d9f95ddb2ef33 || >=4090fa373f0e763c43610853d2774b5979915959 <1293fd69a50d188a5788b08ba3741a3e86be1608 || >=4090fa373f0e763c43610853d2774b5979915959 <fe198b077864feafd4aa4b33b1a5ce26f50195a2 || >=4090fa373f0e763c43610853d2774b5979915959 <e3702470ced94fad74d71e2232f022d2eb752a6d || >=4090fa373f0e763c43610853d2774b5979915959 <594d905195024b228c962627ae5ae7c17bd582a4 || >=6.1.141 <6.1.189 || >=6.6.93 <6.6.158 | 2b6c2842692d08e7acaf32d1eb47f95def35f3fe, 6fda5c51b8e43a8440f76e65c89d9f95ddb2ef33, 1293fd69a50d188a5788b08ba3741a3e86be1608, fe198b077864feafd4aa4b33b1a5ce26f50195a2, e3702470ced94fad74d71e2232f022d2eb752a6d, 594d905195024b228c962627ae5ae7c17bd582a4, 6.1.189, 6.6.158 |
| Linux/Linuxgeneric | >=4090fa373f0e763c43610853d2774b5979915959 <e3702470ced94fad74d71e2232f022d2eb752a6d || >=4090fa373f0e763c43610853d2774b5979915959 <594d905195024b228c962627ae5ae7c17bd582a4 || 5dfd283f4651d04dbb70ceb9ae5c4a30eda3c52a || de7921631ff323369aa63a4324695ab54ea4047e || >=6.1.141 <6.2 || >=6.6.93 <6.7 | e3702470ced94fad74d71e2232f022d2eb752a6d, 594d905195024b228c962627ae5ae7c17bd582a4, 6.2, 6.7 |
| Linux/Linuxgeneric | >=4090fa373f0e763c43610853d2774b5979915959 <1293fd69a50d188a5788b08ba3741a3e86be1608 || >=4090fa373f0e763c43610853d2774b5979915959 <fe198b077864feafd4aa4b33b1a5ce26f50195a2 || >=4090fa373f0e763c43610853d2774b5979915959 <e3702470ced94fad74d71e2232f022d2eb752a6d || >=4090fa373f0e763c43610853d2774b5979915959 <594d905195024b228c962627ae5ae7c17bd582a4 || 5dfd283f4651d04dbb70ceb9ae5c4a30eda3c52a || de7921631ff323369aa63a4324695ab54ea4047e || >=6.1.141 <6.2 || >=6.6.93 <6.7 | 1293fd69a50d188a5788b08ba3741a3e86be1608, fe198b077864feafd4aa4b33b1a5ce26f50195a2, e3702470ced94fad74d71e2232f022d2eb752a6d, 594d905195024b228c962627ae5ae7c17bd582a4, 6.2, 6.7 |
Published upstream
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 3, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 26, 2026
In the Linux kernel, the following vulnerability has been resolved: af_unix: Unlink scc_entry in unix_del_edge(). Kyle Zeng reported that GC could free a dead SCC partially. The scenario is as follows: 1) Create two SCCs: X -. A <-> B ^--' 2) Run the following concurrently: 2-1) send() sk-B to sk-B from sk-X 2-2) close() both A and B At 2-1), there is a small window where unix_add_edges() publishes a new edge (B <-> B) to GC but its skb is not queued by skb_queue_tail(). If 2-2) completes before skb_queue_tail() and GC is triggered, it judges A <-> B as dead, but B is not freed because GC cannot collect the not-yet-queued skb holding the B <-> B edge. X -. A <-> B -. This edge is visible ^--' ^..' but skb is not This itself is not a problem since the next GC run will judge B as dead as well and free it finally. X -. A <.> B -. ^--' ^--' However, X's SCC forces the next GC to call unix_walk_scc_fast(), and it iterates over A through B's scc_entry. Let's unlink scc_entry before freeing the vertex in unix_del_edge().
Quoted source text, attributed separately from HOL analysis.