{"id":"CVE-2026-72334","state":"PUBLISHED","title":"Bluetooth: ISO: fix malformed ISO_END/CONT handling","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: fix malformed ISO_END/CONT handling\n\nCore specification (Part C vol 4 sec 5.4.5) does not exclude empty\nISO_CONT, ISO_END packets.  We currently reject them if they are last.\n\nIf controller sends malformed sequence\n\n    ISO_START -> rx_len = 4, ISO_CONT skb->len 4, ISO_START\n\nthat ends payload in ISO_CONT, we leak conn->rx_skb. If controller sends\ntoo long ISO_END, we panic on skb_put. If controller sends too short\nISO_END we accept it.\n\nFix by marking unfinished ISO_START via conn->rx_skb != NULL.  Check\nskb->len properly before skb_put.  Combine the ISO_CONT/END code paths\nas they require the same initial checks. Reject too short ISO_END\npackets.","publishedAt":"2026-08-15T05:55:43.160Z","updatedAt":"2026-10-16T18:55:18.395Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","status":"affected","lessThan":"d2df29dc9abda2fc10ff522eac0969f5b77b3637","versionType":"git"},{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","status":"affected","lessThan":"7250b6b5ba9b737cff2c2c1d0760360c7b6bca00","versionType":"git"},{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","status":"affected","lessThan":"49aeb54e3c912ef785311264a51ab9f3698e421b","versionType":"git"},{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","status":"affected","lessThan":"5e53e285f8c989662e34d4938c728a94226bff34","versionType":"git"},{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","status":"affected","lessThan":"990e65eb9387c4ddfa7f68782b6644c2c35d489f","versionType":"git"},{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","status":"affected","lessThan":"e054c1a6ae7310d2815778fddb87da616e11c255","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/iso.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/iso.c"]}],"references":["https://git.kernel.org/stable/c/d2df29dc9abda2fc10ff522eac0969f5b77b3637","https://git.kernel.org/stable/c/7250b6b5ba9b737cff2c2c1d0760360c7b6bca00","https://git.kernel.org/stable/c/49aeb54e3c912ef785311264a51ab9f3698e421b","https://git.kernel.org/stable/c/5e53e285f8c989662e34d4938c728a94226bff34","https://git.kernel.org/stable/c/990e65eb9387c4ddfa7f68782b6644c2c35d489f","https://git.kernel.org/stable/c/e054c1a6ae7310d2815778fddb87da616e11c255"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/72xxx/CVE-2026-72334.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72334","state":"PUBLISHED","datePublished":"2026-08-15T05:55:43.160Z","dateUpdated":"2026-10-16T18:55:18.395Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-09T03:40:39.920Z"},"containers":{"cna":{"title":"Bluetooth: ISO: fix malformed ISO_END/CONT handling","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: fix malformed ISO_END/CONT handling\n\nCore specification (Part C vol 4 sec 5.4.5) does not exclude empty\nISO_CONT, ISO_END packets.  We currently reject them if they are last.\n\nIf controller sends malformed sequence\n\n    ISO_START -> rx_len = 4, ISO_CONT skb->len 4, ISO_START\n\nthat ends payload in ISO_CONT, we leak conn->rx_skb. If controller sends\ntoo long ISO_END, we panic on skb_put. If controller sends too short\nISO_END we accept it.\n\nFix by marking unfinished ISO_START via conn->rx_skb != NULL.  Check\nskb->len properly before skb_put.  Combine the ISO_CONT/END code paths\nas they require the same initial checks. Reject too short ISO_END\npackets."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","status":"affected","lessThan":"d2df29dc9abda2fc10ff522eac0969f5b77b3637","versionType":"git"},{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","status":"affected","lessThan":"7250b6b5ba9b737cff2c2c1d0760360c7b6bca00","versionType":"git"},{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","status":"affected","lessThan":"49aeb54e3c912ef785311264a51ab9f3698e421b","versionType":"git"},{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","status":"affected","lessThan":"5e53e285f8c989662e34d4938c728a94226bff34","versionType":"git"},{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","status":"affected","lessThan":"990e65eb9387c4ddfa7f68782b6644c2c35d489f","versionType":"git"},{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","status":"affected","lessThan":"e054c1a6ae7310d2815778fddb87da616e11c255","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/iso.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/iso.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/d2df29dc9abda2fc10ff522eac0969f5b77b3637"},{"url":"https://git.kernel.org/stable/c/7250b6b5ba9b737cff2c2c1d0760360c7b6bca00"},{"url":"https://git.kernel.org/stable/c/49aeb54e3c912ef785311264a51ab9f3698e421b"},{"url":"https://git.kernel.org/stable/c/5e53e285f8c989662e34d4938c728a94226bff34"},{"url":"https://git.kernel.org/stable/c/990e65eb9387c4ddfa7f68782b6644c2c35d489f"},{"url":"https://git.kernel.org/stable/c/e054c1a6ae7310d2815778fddb87da616e11c255"}],"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 iso_recv(), which handles HCI ISO data from the Bluetooth controller during active CIS/BIS ISO transports; a nearby radio peer can deliver malformed ISO fragment sequences without any IP/network path.\nAC:L - An adjacent attacker can reliably craft the malformed ISO_START/ISO_CONT/ISO_END sequences described in the fix (or inject equivalent HCI ISO packets) to trigger skb_put overflow, skb leaks, or acceptance of undersized END fragments.\nPR:N - No Linux credentials are required; an unauthenticated adjacent Bluetooth broadcaster on BIS or CIS peer can drive the vulnerable reassembly path once the victim host has an active ISO connection.\nUI:N - Exploitation does not require a distinct victim action at trigger time; hosts with Bluetooth enabled routinely maintain CIS sessions or background BIS/LE Audio sync that already deliver ISO traffic to iso_recv().\nS:U - Impact is confined to kernel heap corruption and denial of service within the Bluetooth ISO receive path and does not cross VM, container, or IOMMU security boundaries.\nC:H - An oversized ISO_END causes skb_put() to write past the allocated rx_skb buffer (heap overflow), enabling disclosure of adjacent kernel memory per memory-corruption scoring guidance.\nI:H - The skb_put heap overflow writes attacker-controlled ISO payload bytes beyond the skb tail, corrupting adjacent kernel objects and enabling potential arbitrary write or code execution primitives.\nA:H - Oversized ISO_END triggers skb_over_panic (BUG/kernel oops), and repeated malformed sequences leak conn->rx_skb causing memory exhaustion, both producing complete host denial of service."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-03T10:55:50.052Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-72334","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T18:47:11.084892Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-16T18:55:18.395Z"}}]}}}