CVE-2026-64406 (GCVE-0-2026-64406)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-07-27 05:00
VLAI
Title
Bluetooth: fix UAF in bt_accept_dequeue()
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix UAF in bt_accept_dequeue() bt_accept_get() takes a temporary reference before dropping the accept queue lock. bt_accept_dequeue() currently drops that reference before bt_accept_unlink(), leaving only the queue reference. bt_accept_unlink() drops the queue reference. The subsequent sock_hold() therefore accesses freed memory if it was the final reference, as observed by KASAN during listening L2CAP socket cleanup. Retain the temporary queue-walk reference through unlink and hand it to the caller on success. Drop it explicitly on the closed and not-yet-connected paths.
Severity
8 (High)
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 751de6ec671fe75ad9cf65a0638d2a06b6a5984d , < c0577c55219be42b6ea2ea8db11e85bfab6f4e8d (git)
Affected: 407217734835d21d4e0105ebf347860dc1806f88 , < 96ad400d5132eb333f28f6f1e2d58f0728ca9547 (git)
Affected: 7eebd4c2c86f573af87ff165d08a83432eb0b919 , < 0a98ff4e7b867f72fbb4e1237d81e9fa02ded0a0 (git)
Affected: 5d86d2f1b4d9a508c441d3e45277ae1a73cfed57 , < c66a95e60b65d876a927123b0ed36bd6177d9ca6 (git)
Affected: 87c543e2f78d0871f271df92dab98901bbd5b6f5 , < 6303ed4bbe0095f4cc195225479bf506e010d1db (git)
Affected: added1213395071470a900cc845a042fb51882a6 , < 26168db1ce5a9766cde021b18e590a101c056614 (git)
Affected: ab1513597c6cf17cd1ad2a21e3b045421b48e022 , < 50c662bdcd51b03033a0abed6716bfd377ba1049 (git)
Affected: ab1513597c6cf17cd1ad2a21e3b045421b48e022 , < 4bd0b274054f2679f28b70222b607bb0afc3ab9a (git)
Affected: a5ca86a6097a8b030ca3226cd300b17ed330f966 (git)
Affected: 5.10.259 , < 5.10.261 (semver)
Affected: 5.15.210 , < 5.15.212 (semver)
Affected: 6.1.175 , < 6.1.178 (semver)
Affected: 6.6.142 , < 6.6.145 (semver)
Affected: 6.12.92 , < 6.12.96 (semver)
Affected: 6.18.34 , < 6.18.39 (semver)
Affected: 7.0.11 , < 7.1 (semver)
Create a notification for this product.
Linux Linux Affected: 7.1
Unaffected: 0 , < 7.1 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc3 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: fix UAF in bt_accept_dequeue()\n\nbt_accept_get() takes a temporary reference before dropping the accept\nqueue lock. bt_accept_dequeue() currently drops that reference before\nbt_accept_unlink(), leaving only the queue reference.\n\nbt_accept_unlink() drops the queue reference. The subsequent\nsock_hold() therefore accesses freed memory if it was the final\nreference, as observed by KASAN during listening L2CAP socket cleanup.\n\nRetain the temporary queue-walk reference through unlink and hand it to\nthe caller on success. Drop it explicitly on the closed and\nnot-yet-connected paths."
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/96ad400d5132eb333f28f6f1e2d58f0728ca9547"
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      "title": "Bluetooth: fix UAF in bt_accept_dequeue()",
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    "datePublished": "2026-07-25T08:50:47.978Z",
    "dateReserved": "2026-07-19T15:36:31.786Z",
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Drop it explicitly on the closed and\\nnot-yet-connected paths.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bluetooth/af_bluetooth.c\",\"net/bluetooth/l2cap_sock.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"751de6ec671fe75ad9cf65a0638d2a06b6a5984d\",\"lessThan\":\"c0577c55219be42b6ea2ea8db11e85bfab6f4e8d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"407217734835d21d4e0105ebf347860dc1806f88\",\"lessThan\":\"96ad400d5132eb333f28f6f1e2d58f0728ca9547\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7eebd4c2c86f573af87ff165d08a83432eb0b919\",\"lessThan\":\"0a98ff4e7b867f72fbb4e1237d81e9fa02ded0a0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5d86d2f1b4d9a508c441d3e45277ae1a73cfed57\",\"lessThan\":\"c66a95e60b65d876a927123b0ed36bd6177d9ca6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"87c543e2f78d0871f271df92dab98901bbd5b6f5\",\"lessThan\":\"6303ed4bbe0095f4cc195225479bf506e010d1db\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"added1213395071470a900cc845a042fb51882a6\",\"lessThan\":\"26168db1ce5a9766cde021b18e590a101c056614\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ab1513597c6cf17cd1ad2a21e3b045421b48e022\",\"lessThan\":\"50c662bdcd51b03033a0abed6716bfd377ba1049\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ab1513597c6cf17cd1ad2a21e3b045421b48e022\",\"lessThan\":\"4bd0b274054f2679f28b70222b607bb0afc3ab9a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a5ca86a6097a8b030ca3226cd300b17ed330f966\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.259\",\"lessThan\":\"5.10.261\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.210\",\"lessThan\":\"5.15.212\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.175\",\"lessThan\":\"6.1.178\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.142\",\"lessThan\":\"6.6.145\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.12.92\",\"lessThan\":\"6.12.96\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.18.34\",\"lessThan\":\"6.18.39\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.0.11\",\"lessThan\":\"7.1\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bluetooth/af_bluetooth.c\",\"net/bluetooth/l2cap_sock.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7.1\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"7.1\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc3\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.0,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.1,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0a98ff4e7b867f72fbb4e1237d81e9fa02ded0a0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/26168db1ce5a9766cde021b18e590a101c056614\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4bd0b274054f2679f28b70222b607bb0afc3ab9a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/50c662bdcd51b03033a0abed6716bfd377ba1049\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6303ed4bbe0095f4cc195225479bf506e010d1db\",\"source\":\"416b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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-27T07:08:26+00:00",
      "cve": "CVE-2026-64406",
      "id": "CVE-2026-64406",
      "initial_release_date": "2026-07-25T00:00:00+00:00",
      "product_status:known_affected": "90",
      "product_status:known_not_affected": "185",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: fix UAF in bt_accept_dequeue()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64406.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T15:59:56Z",
      "cve": "CVE-2026-64406",
      "id": "CVE-2026-64406",
      "initial_release_date": "2026-07-25T15:59:56Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64406",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64406.json",
      "version": "2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.