af_unix: Unlink scc_entry in unix_del_edge().
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().
CVE-2026-80521
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-80521
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5dfd283f4651d04dbb70ceb9ae5c4a30eda3c52a",
"lessThan": "2b6c2842692d08e7acaf32d1eb47f95def35f3fe",
"versionType": "git"
},
{
"status": "affected",
"version": "de7921631ff323369aa63a4324695ab54ea4047e",
"lessThan": "6fda5c51b8e43a8440f76e65c89d9f95ddb2ef33",
"versionType": "git"
},
{
"status": "affected",
"version": "4090fa373f0e763c43610853d2774b5979915959",
"lessThan": "1293fd69a50d188a5788b08ba3741a3e86be1608",
"versionType": "git"
},
{
"status": "affected",
"version": "4090fa373f0e763c43610853d2774b5979915959",
"lessThan": "fe198b077864feafd4aa4b33b1a5ce26f50195a2",
"versionType": "git"
},
{
"status": "affected",
"version": "4090fa373f0e763c43610853d2774b5979915959",
"lessThan": "e3702470ced94fad74d71e2232f022d2eb752a6d",
"versionType": "git"
},
{
"status": "affected",
"version": "4090fa373f0e763c43610853d2774b5979915959",
"lessThan": "594d905195024b228c962627ae5ae7c17bd582a4",
"versionType": "git"
},
{
"status": "affected",
"version": "6.1.141",
"lessThan": "6.1.189",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.6.93",
"lessThan": "6.6.158",
"versionType": "semver"
}
],
"programFiles": [
"net/unix/garbage.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.10"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.10",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.10",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/unix/garbage.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80521
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #8256 · Revision 1
- Added to Heist Feed
- Publisher date