{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80721","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-26T14:34:25.788Z","datePublished":"2026-08-28T06:53:17.278Z","dateUpdated":"2026-08-30T07:08:36.447Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-30T07:08:36.447Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: ensure no dangling hcon references in iso_conn\n\nAfter iso_conn_del(), ISO sockets should not dereference the hcon any\nmore.  Currently, clearing iso_conn::hcon relies on iso_conn_del()\nreleasing the last reference to the iso_conn.\n\nSimplify this by explicitly clearing conn->hcon in iso_conn_del(), to\navoid more complex reasoning on races about who holds the last\nreference."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:A - The bug is in Bluetooth ISO connection teardown (iso_conn_del/iso_conn_free); reachable when an adjacent peer triggers HCI disconnect/connect-failure events or sends ISO traffic processed by iso_recv, without network or physical USB access.\nAC:L - An adjacent attacker controls both sides of the refcount race by timing remote disconnects and ISO packets against local teardown; no rare layout or victim-specific state beyond an active ISO session is required.\nPR:N - No local privileges are required on the victim; an unauthenticated adjacent Bluetooth peer can trigger iso_disconn_cfm/iso_connect_cfm teardown on phones and desktops with Bluetooth and LE Audio/ISO enabled.\nUI:N - Exploitation needs no victim interaction during the attack; once Bluetooth is on and an ISO link exists (e.g., LE Audio), remote disconnect and ISO traffic alone can hit the race.\nS:U - The flaw causes kernel heap use-after-free on hci_conn via dangling iso_conn::hcon references; impact stays within kernel memory safety, not a VM escape or cross-authority boundary.\nC:H - After hci_conn_del frees hcon, iso_conn still holds conn->hcon; subsequent iso_conn_free or socket paths dereference freed hci_conn memory, a classic UAF read primitive.\nI:H - Use-after-free on hci_conn enables corrupting connection management fields and hci_conn_drop state; such kernel heap UAF bugs are routinely leveraged for arbitrary write and code execution.\nA:H - Dereferencing freed hci_conn in iso_conn_free or ISO socket teardown reliably causes kernel oops or panic, giving unprivileged adjacent attackers a repeatable denial-of-service."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/iso.c"],"versions":[{"version":"dc26097bdb864a0d5955b9a25e43376ffc1af99b","lessThan":"e941799c31f68e67ce0976efb38a79101f921b64","status":"affected","versionType":"git"},{"version":"dc26097bdb864a0d5955b9a25e43376ffc1af99b","lessThan":"cdce8af9291d8a1f8916c271de029bf558d9e8ec","status":"affected","versionType":"git"},{"version":"dc26097bdb864a0d5955b9a25e43376ffc1af99b","lessThan":"aa9f7cb2bd3a2be998ceb739fc9a2f986eba43eb","status":"affected","versionType":"git"},{"version":"f53e7489273dc2bb307bf50f319b3762d45534f0","status":"affected","versionType":"git"},{"version":"a58d0f5dac322e16cc75334d000666512341bde5","status":"affected","versionType":"git"},{"version":"6.11.11","lessThan":"6.12","status":"affected","versionType":"semver"},{"version":"6.12.2","lessThan":"6.13","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/iso.c"],"versions":[{"version":"6.13","status":"affected"},{"version":"0","lessThan":"6.13","status":"unaffected","versionType":"semver"},{"version":"6.18.44","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.8","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.18.44"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"7.1.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"7.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/e941799c31f68e67ce0976efb38a79101f921b64"},{"url":"https://git.kernel.org/stable/c/cdce8af9291d8a1f8916c271de029bf558d9e8ec"},{"url":"https://git.kernel.org/stable/c/aa9f7cb2bd3a2be998ceb739fc9a2f986eba43eb"}],"title":"Bluetooth: ISO: ensure no dangling hcon references in iso_conn","x_generator":{"engine":"bippy-1.2.0"}}}}