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": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/iso.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.0"
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              "status": "unaffected",
              "version": "0",
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              "versionType": "semver"
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      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.44",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.8",
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                  "vulnerable": true
                },
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "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"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/96ed3c772c08e7a91c399567f412618e43231023"
        },
        {
          "url": "https://git.kernel.org/stable/c/e76a0ae6542ae43241b2147bacf4990e7ae5316a"
        },
        {
          "url": "https://git.kernel.org/stable/c/e30e5ca63c8fbe3cd505fbb419bb547760cda633"
        },
        {
          "url": "https://git.kernel.org/stable/c/ce57442a379212fe3fda59c9437ee8217eceb5b1"
        }
      ],
      "title": "Bluetooth: ISO: fix leaking sk after socket release",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74536",
    "datePublished": "2026-08-15T12:27:49.054Z",
    "dateReserved": "2026-08-15T05:44:03.913Z",
    "dateUpdated": "2026-08-17T05:21:20.361Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74536",
      "date": "2026-08-28",
      "epss": "0.00168",
      "percentile": "0.06297"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-23T14:53:33.000Z",
      "cve": "CVE-2026-74536",
      "id": "msrc_CVE-2026-74536",
      "initial_release_date": "2026-08-23T14:53:33.000Z",
      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Bluetooth: ISO: fix leaking sk after socket release",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74536.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74536\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T13:17:58.940\",\"lastModified\":\"2026-08-17T06:19:50.720\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bluetooth/iso.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ccf74f2390d60a2f9a75ef496d2564abb478f46a\",\"lessThan\":\"96ed3c772c08e7a91c399567f412618e43231023\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccf74f2390d60a2f9a75ef496d2564abb478f46a\",\"lessThan\":\"e76a0ae6542ae43241b2147bacf4990e7ae5316a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccf74f2390d60a2f9a75ef496d2564abb478f46a\",\"lessThan\":\"e30e5ca63c8fbe3cd505fbb419bb547760cda633\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccf74f2390d60a2f9a75ef496d2564abb478f46a\",\"lessThan\":\"ce57442a379212fe3fda59c9437ee8217eceb5b1\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bluetooth/iso.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/96ed3c772c08e7a91c399567f412618e43231023\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ce57442a379212fe3fda59c9437ee8217eceb5b1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e30e5ca63c8fbe3cd505fbb419bb547760cda633\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e76a0ae6542ae43241b2147bacf4990e7ae5316a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-19T17:54:22+00:00",
      "cve": "CVE-2026-74536",
      "id": "CVE-2026-74536",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: ISO: fix leaking sk after socket release",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74536.json",
      "version": "3"
    }
  }
}



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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.

Sightings

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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.


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