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tipc: read le->link under the node lock in tipc_node_link_down()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: tipc: read le->link under the node lock in tipc_node_link_down() tipc_node_link_down() caches the link pointer before taking n->lock: struct tipc_link *l = le->link; /* unlocked */ if (!l) return; tipc_node_write_lock(n); if (!tipc_link_is_establishing(l)) { /* deref l */ ... tipc_link_reset(l); /* write into l */ if (delete) { kfree(l); le->link = NULL; The delete=true caller frees that very object under n->lock, so the lock does not protect the cached pointer against it: - CPU A, delete=false: tipc_rcv() on TIPC_LINK_DOWN_EVT, or the link supervision timer via tipc_node_timeout(), reads l unlocked and then dereferences it under n->lock; - CPU B, delete=true: netlink TIPC_NL_BEARER_DISABLE -> bearer_disable() -> tipc_node_delete_links() -> tipc_node_link_down(n, bearer_id, true) -> kfree(l). The link is freed with plain kfree(), not kfree_rcu(), and for UDP bearers disable_media() only schedules the asynchronous cleanup_bearer() work, so its synchronize_net() runs after the links are already gone. An in-flight CPU A that has read l therefore dereferences freed memory once B frees it: a use-after-free read in tipc_link_is_establishing(), and a use-after-free write via tipc_link_reset() on the establishing branch. The following trace was captured on 7.2.0-rc5-00284-gaf39eb111ce6: BUG: KASAN: slab-use-after-free in tipc_link_is_establishing (net/tipc/link.c:285) Read of size 4 at addr ffff88802e2aa068 by task s

Announced Source revision 1
Original source ↗

CVE-2026-74609

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-2026-74609

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": "73f646cec35477b5099d7e952297cb9e1855be45",
        "lessThan": "2be741ad565c610871a6a95062c12c39da7168fd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "73f646cec35477b5099d7e952297cb9e1855be45",
        "lessThan": "69d209461c110388710e483a130caf051e4fd09a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "73f646cec35477b5099d7e952297cb9e1855be45",
        "lessThan": "de017c22135f545ca4e65d1eada22887b64958eb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "73f646cec35477b5099d7e952297cb9e1855be45",
        "lessThan": "47ba70891b10b2feb52462086b7fcd2ad75d3ce3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "73f646cec35477b5099d7e952297cb9e1855be45",
        "lessThan": "a714d62513befef37f71f4ae89bb1fe173b65f2e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "73f646cec35477b5099d7e952297cb9e1855be45",
        "lessThan": "c3f2347a47754eac690967cfd82cb6d559817b07",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "73f646cec35477b5099d7e952297cb9e1855be45",
        "lessThan": "5558a8312452ddb21eff22b1cbd84302ad951944",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "73f646cec35477b5099d7e952297cb9e1855be45",
        "lessThan": "cba9ccb47e9fa4cc77692fb896cc5ab57a667882",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/tipc/node.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.4"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.4",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.265",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.216",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.183",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.152",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.104",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.45",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.9",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/tipc/node.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74609

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#33235 · Revision 1
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Publisher date
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