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

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-10-16 19:05
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
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 18:59 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6992 records in the last 180 days details
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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              "content": {
                "id": "CVE-2026-74539",
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                "timestamp": "2026-10-16T18:59:39.142927Z",
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              "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."
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      "title": "Bluetooth: ISO: lock sk in iso_sock_getname",
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    "dateReserved": "2026-08-15T05:44:03.913Z",
    "dateUpdated": "2026-10-16T19:05:54.465Z",
    "state": "PUBLISHED"
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      "product_status:known_affected": "184",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: Bluetooth: ISO: lock sk in iso_sock_getname",
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}



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