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CVE-2026-89774 (GCVE-0-2026-89774)

Vulnerability from cvelistv5 – Published: 2026-09-16 08:24 – Updated: 2026-09-16 08:51
VLAI
Title
Bluetooth: SCO: hold sk properly in sco_conn_ready
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: SCO: hold sk properly in sco_conn_ready sk deref in sco_conn_ready must be done either under conn->lock, or holding a refcount, to avoid concurrent close. conn->sk and parent sk is currently accessed without either, and without checking parent->sk_state: [Task 1] [Task 2] sco_sock_release sco_conn_ready sk = conn->sk lock_sock(sk) conn->sk = NULL lock_sock(sk) release_sock(sk) sco_sock_kill(sk) UAF on sk deref and similarly for access to sco_get_sock_listen() return value. Fix possible UAF by holding sk refcount in sco_conn_ready() and making sco_get_sock_listen() increase refcount. Also recheck after lock_sock that the socket is still valid. Adjust conn->sk locking so it's protected also by lock_sock() of the associated socket if any.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 27c24fda62b601d6f9ca5e992502578c4310876f , < 50aae396dc30377bec8e3b181b8346f8fd38f7d8 (git)
Affected: 27c24fda62b601d6f9ca5e992502578c4310876f , < 6e3840578aaad1a296aab1eaaa89ea3b7d5cbae1 (git)
Affected: 27c24fda62b601d6f9ca5e992502578c4310876f , < d141d9b769bcd1b747898528c5023270cda040f2 (git)
Affected: 27c24fda62b601d6f9ca5e992502578c4310876f , < 73cb063f5ec6ca51eb1e246c6d332563002ac277 (git)
Affected: 27c24fda62b601d6f9ca5e992502578c4310876f , < 7199c78c3a3e399a4dc439d845826793880ccedc (git)
Affected: 27c24fda62b601d6f9ca5e992502578c4310876f , < 4e37f6452d586b95c346a9abdd2fb80b67794f39 (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/sco.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "status": "affected",
              "version": "27c24fda62b601d6f9ca5e992502578c4310876f",
              "versionType": "git"
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "5.15"
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              "version": "0",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.212",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
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                {
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                },
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                  "versionStartIncluding": "5.15",
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: SCO: hold sk properly in sco_conn_ready\n\nsk deref in sco_conn_ready must be done either under conn-\u003elock, or\nholding a refcount, to avoid concurrent close. conn-\u003esk and parent sk is\ncurrently accessed without either, and without checking parent-\u003esk_state:\n\n    [Task 1]            [Task 2]\n                        sco_sock_release\n    sco_conn_ready\n      sk = conn-\u003esk\n                          lock_sock(sk)\n                            conn-\u003esk = NULL\n      lock_sock(sk)\n                          release_sock(sk)\n                          sco_sock_kill(sk)\n       UAF on sk deref\n\nand similarly for access to sco_get_sock_listen() return value.\n\nFix possible UAF by holding sk refcount in sco_conn_ready() and making\nsco_get_sock_listen() increase refcount. Also recheck after lock_sock\nthat the socket is still valid.  Adjust conn-\u003esk locking so it\u0027s\nprotected also by lock_sock() of the associated socket if any."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-16T08:51:15.478Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/50aae396dc30377bec8e3b181b8346f8fd38f7d8"
        },
        {
          "url": "https://git.kernel.org/stable/c/6e3840578aaad1a296aab1eaaa89ea3b7d5cbae1"
        },
        {
          "url": "https://git.kernel.org/stable/c/d141d9b769bcd1b747898528c5023270cda040f2"
        },
        {
          "url": "https://git.kernel.org/stable/c/73cb063f5ec6ca51eb1e246c6d332563002ac277"
        },
        {
          "url": "https://git.kernel.org/stable/c/7199c78c3a3e399a4dc439d845826793880ccedc"
        },
        {
          "url": "https://git.kernel.org/stable/c/4e37f6452d586b95c346a9abdd2fb80b67794f39"
        }
      ],
      "title": "Bluetooth: SCO: hold sk properly in sco_conn_ready",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89774",
    "datePublished": "2026-09-16T08:24:21.248Z",
    "dateReserved": "2026-09-11T19:38:34.765Z",
    "dateUpdated": "2026-09-16T08:51:15.478Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-89774\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-16T09:17:07.717\",\"lastModified\":\"2026-09-16T09:17:07.717\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: SCO: hold sk properly in sco_conn_ready\\n\\nsk deref in sco_conn_ready must be done either under conn-\u003elock, or\\nholding a refcount, to avoid concurrent close. conn-\u003esk and parent sk is\\ncurrently accessed without either, and without checking parent-\u003esk_state:\\n\\n    [Task 1]            [Task 2]\\n                        sco_sock_release\\n    sco_conn_ready\\n      sk = conn-\u003esk\\n                          lock_sock(sk)\\n                            conn-\u003esk = NULL\\n      lock_sock(sk)\\n                          release_sock(sk)\\n                          sco_sock_kill(sk)\\n       UAF on sk deref\\n\\nand similarly for access to sco_get_sock_listen() return value.\\n\\nFix possible UAF by holding sk refcount in sco_conn_ready() and making\\nsco_get_sock_listen() increase refcount. Also recheck after lock_sock\\nthat the socket is still valid.  Adjust conn-\u003esk locking so it\u0027s\\nprotected also by lock_sock() of the associated socket if any.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bluetooth/sco.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"27c24fda62b601d6f9ca5e992502578c4310876f\",\"lessThan\":\"50aae396dc30377bec8e3b181b8346f8fd38f7d8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"27c24fda62b601d6f9ca5e992502578c4310876f\",\"lessThan\":\"6e3840578aaad1a296aab1eaaa89ea3b7d5cbae1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"27c24fda62b601d6f9ca5e992502578c4310876f\",\"lessThan\":\"d141d9b769bcd1b747898528c5023270cda040f2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"27c24fda62b601d6f9ca5e992502578c4310876f\",\"lessThan\":\"73cb063f5ec6ca51eb1e246c6d332563002ac277\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"27c24fda62b601d6f9ca5e992502578c4310876f\",\"lessThan\":\"7199c78c3a3e399a4dc439d845826793880ccedc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"27c24fda62b601d6f9ca5e992502578c4310876f\",\"lessThan\":\"4e37f6452d586b95c346a9abdd2fb80b67794f39\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bluetooth/sco.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.15\",\"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\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4e37f6452d586b95c346a9abdd2fb80b67794f39\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/50aae396dc30377bec8e3b181b8346f8fd38f7d8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6e3840578aaad1a296aab1eaaa89ea3b7d5cbae1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7199c78c3a3e399a4dc439d845826793880ccedc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/73cb063f5ec6ca51eb1e246c6d332563002ac277\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d141d9b769bcd1b747898528c5023270cda040f2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



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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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.