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CVE-2026-74539 (GCVE-0-2026-74539)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-17 05:48
VLAI
Title
Bluetooth: ISO: lock sk in iso_sock_getname
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: lock sk in iso_sock_getname Accessing iso_pi(sk)->conn requires lock_sock, which is not held here. Fix by adding the lock/release.
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 CPE status
Linux Linux Affected: 2df108c227b266a9ec9e3fda3828d2ac9662aa33 , < 72d5bb1d77d7c3330146dc0cfd43f704c64b9594 (git)
Affected: 2df108c227b266a9ec9e3fda3828d2ac9662aa33 , < 202670e6602e068558c1fca2df40719ee91a2906 (git)
Affected: 2df108c227b266a9ec9e3fda3828d2ac9662aa33 , < 89cf154d7c18e6e94a3da83051f3cf2bac317ae2 (git)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (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",
          "vendor": "Linux",
          "versions": [
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          "versions": [
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              "version": "0",
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              "version": "7.1.8",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.16",
                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: lock sk in iso_sock_getname\n\nAccessing iso_pi(sk)-\u003econn requires lock_sock, which is not held here.\n\nFix by adding the lock/release."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The unlocked `iso_sock_getname()` path is entered only via the local `getpeername()` syscall, but the freeing side races through `iso_conn_del()`/`iso_chan_del()` driven by HCI connect/disconnect events that an adjacent Bluetooth peer can time (CIS/BIS/PA teardown on LE Audio phones, headsets, or kiosks).\nAC:L - An attacker controls both race sides: one thread loops `getpeername()` on a `BTPROTO_ISO` socket while another concurrently calls `close()`/`connect()` or an adjacent peer provokes HCI disconnect; unlimited retries make winning the TOCTOU on `iso_pi(sk)-\u003econn` reliably achievable.\nPR:L - `iso_sock_create()`/`bt_sock_create()` impose no `CAP_NET_ADMIN` or other capability check; any unprivileged local user in the initial network namespace who can open `AF_BLUETOOTH`/`BTPROTO_ISO` sockets can reach the vulnerable `getpeername()` handler (Bluetooth is unavailable in user namespaces).\nUI:N - Exploitation requires only attacker-controlled ISO socket syscalls and concurrent connection teardown; no victim pairing prompt, mount, or other deliberate user action beyond normal Bluetooth LE Audio use on an already-configured device.\nS:U - Impact is kernel heap UAF/crash or privilege escalation within the host kernel security boundary; it does not cross VM, hypervisor, IOMMU, or application-sandbox boundaries.\nC:H - The double-read `iso_pi(sk)-\u003econn ? iso_pi(sk)-\u003econn-\u003ehcon` without `lock_sock` is a classic TOCTOU UAF; dereferencing a freed `iso_conn` and stale `hcon` exposes attacker-influenced kernel heap contents and is leverageable for arbitrary memory disclosure.\nI:H - UAF on the `iso_conn` kmalloc object (~136-byte slab) enables heap grooming/spray; corrupted `hcon` pointers and subsequent kernel reads through attacker-controlled freed memory provide write primitives chainable to control-flow hijack per kernel UAF scoring guidance.\nA:H - Racing `iso_chan_del()` during the unlocked `conn-\u003ehcon` dereference or `hcon-\u003etype` access can cause immediate kernel oops/panic from NULL/invalid pointer access; UAF in connection teardown independently threatens host availability even before full exploitation."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:48:27.740Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/72d5bb1d77d7c3330146dc0cfd43f704c64b9594"
        },
        {
          "url": "https://git.kernel.org/stable/c/202670e6602e068558c1fca2df40719ee91a2906"
        },
        {
          "url": "https://git.kernel.org/stable/c/89cf154d7c18e6e94a3da83051f3cf2bac317ae2"
        }
      ],
      "title": "Bluetooth: ISO: lock sk in iso_sock_getname",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74539",
    "datePublished": "2026-08-15T12:27:50.902Z",
    "dateReserved": "2026-08-15T05:44:03.913Z",
    "dateUpdated": "2026-08-17T05:48:27.740Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-09-04",
      "epss": "0.00249",
      "percentile": "0.16084"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T19:39:48+00:00",
      "cve": "CVE-2026-74539",
      "id": "CVE-2026-74539",
      "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: lock sk in iso_sock_getname",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74539.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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