Skip to content
Heist/ feed
High

Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock iso_sock_close() calls iso_sock_clear_timer() before acquiring lock_sock(sk). iso_sock_clear_timer() reads iso_pi(sk)->conn twice without the socket lock held: if (!iso_pi(sk)->conn) return; cancel_delayed_work(&iso_pi(sk)->conn->timeout_work); Concurrently, iso_conn_del() executes under lock_sock(sk) and calls iso_chan_del(), which sets iso_pi(sk)->conn to NULL and may result in the final reference to the connection being dropped: CPU0 CPU1 ---- ---- iso_sock_clear_timer() if (conn != NULL) ... lock_sock(sk) iso_chan_del() iso_pi(sk)->conn = NULL cancel_delayed_work(conn) /* NULL deref or UAF */ iso_pi(sk)->conn is not stable across the unlock window, causing a NULL pointer dereference or use-after-free. Serialize iso_sock_clear_timer() with the socket lock by moving it inside lock_sock()/release_sock(), matching the pattern used in iso_conn_del() and all other call sites.

Announced Source revision 1
Original source ↗

CVE-2026-63945

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-2026-63945

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": "ccf74f2390d60a2f9a75ef496d2564abb478f46a",
        "lessThan": "d9cbf7144ec589a3f0cc91f74a1a1af2d2b14afa",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ccf74f2390d60a2f9a75ef496d2564abb478f46a",
        "lessThan": "35f68f36d9883d56dec21cf85f7556d4657fc393",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ccf74f2390d60a2f9a75ef496d2564abb478f46a",
        "lessThan": "996c2104d0726a8fe584f85b3d6327197374a348",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ccf74f2390d60a2f9a75ef496d2564abb478f46a",
        "lessThan": "bc08c15746f25f41dd0508b25780d1e84acbb2ef",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ccf74f2390d60a2f9a75ef496d2564abb478f46a",
        "lessThan": "51cb9dcfdf9a1bccf312ab2ae4b62db629f7dcd5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ccf74f2390d60a2f9a75ef496d2564abb478f46a",
        "lessThan": "4b5f8e608749b7e8fa386c6e4301cf9272595859",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/bluetooth/iso.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.0"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.0",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.1.176",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.143",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.93",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.35",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.12",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/bluetooth/iso.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-63945

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40907 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement