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af_unix: Unlink scc_entry in unix_del_edge().

Type: advisorySource: Official CVE List1 source record

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().

Announced Source revision 1
Original source ↗

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
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