CVE-2026-74536 (GCVE-0-2026-74536)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-17 05:21
VLAI
Title
Bluetooth: ISO: fix leaking sk after socket release
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: fix leaking sk after socket release iso_sock_kill() tests !sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket || sock_flag(sk, SOCK_DEAD) for early return, but this is always true since sock_orphan(sk) sets SOCK_DEAD, so the sk reference released by socket always leaks, iso_sock_destruct is never called. The socket reference also leaks when __iso_sock_close() does not set SOCK_ZAPPED, since iso_conn_del() does not call iso_sock_kill() after zapping. Fix by replacing SOCK_DEAD by BT_SK_KILLED flag that is not used for something else, and lock_sock to ensure iso_sock_kill() puts sk only after socket release only once. Release and iso_conn_del may run concurrently. Call iso_sock_kill() from iso_conn_del() to clean sk up after zapping. Remove call to iso_sock_kill() from iso_sock_close(), as it's generally no-op there.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 96ed3c772c08e7a91c399567f412618e43231023 (git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < e76a0ae6542ae43241b2147bacf4990e7ae5316a (git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < e30e5ca63c8fbe3cd505fbb419bb547760cda633 (git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < ce57442a379212fe3fda59c9437ee8217eceb5b1 (git)
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Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/iso.c"
          ],
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          "versions": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: fix leaking sk after socket release\n\niso_sock_kill() tests !sock_flag(sk, SOCK_ZAPPED) || sk-\u003esk_socket ||\nsock_flag(sk, SOCK_DEAD) for early return, but this is always true since\nsock_orphan(sk) sets SOCK_DEAD, so the sk reference released by socket\nalways leaks, iso_sock_destruct is never called.\n\nThe socket reference also leaks when __iso_sock_close() does not set\nSOCK_ZAPPED, since iso_conn_del() does not call iso_sock_kill() after\nzapping.\n\nFix by replacing SOCK_DEAD by BT_SK_KILLED flag that is not used for\nsomething else, and lock_sock to ensure iso_sock_kill() puts sk only\nafter socket release only once. Release and iso_conn_del may run\nconcurrently. Call iso_sock_kill() from iso_conn_del() to clean sk up\nafter zapping.\n\nRemove call to iso_sock_kill() from iso_sock_close(), as it\u0027s generally\nno-op there."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:21:20.361Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "Bluetooth: ISO: fix leaking sk after socket release",
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    "datePublished": "2026-08-15T12:27:49.054Z",
    "dateReserved": "2026-08-15T05:44:03.913Z",
    "dateUpdated": "2026-08-17T05:21:20.361Z",
    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: fix leaking sk after socket release\n\niso_sock_kill() tests !sock_flag(sk, SOCK_ZAPPED) || sk-\u003esk_socket ||\nsock_flag(sk, SOCK_DEAD) for early return, but this is always true since\nsock_orphan(sk) sets SOCK_DEAD, so the sk reference released by socket\nalways leaks, iso_sock_destruct is never called.\n\nThe socket reference also leaks when __iso_sock_close() does not set\nSOCK_ZAPPED, since iso_conn_del() does not call iso_sock_kill() after\nzapping.\n\nFix by replacing SOCK_DEAD by BT_SK_KILLED flag that is not used for\nsomething else, and lock_sock to ensure iso_sock_kill() puts sk only\nafter socket release only once. Release and iso_conn_del may run\nconcurrently. Call iso_sock_kill() from iso_conn_del() to clean sk up\nafter zapping.\n\nRemove call to iso_sock_kill() from iso_sock_close(), as it\u0027s generally\nno-op there."
          }
        ],
        "id": "CVE-2026-74536",
        "lastModified": "2026-08-17T06:19:50.720",
        "metrics": {},
        "published": "2026-08-15T13:17:58.940",
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      "id": "CVE-2026-74536",
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      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74536",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74536.json",
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}



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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.

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  • 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.
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  • 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.


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