{"api_version":"1","generated_at":"2026-08-21T01:31:18+00:00","cve":"CVE-2026-72333","urls":{"html":"https://cve.report/CVE-2026-72333","api":"https://cve.report/api/cve/CVE-2026-72333.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72333","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72333"},"summary":{"title":"Bluetooth: L2CAP: fix tx ident leak for commands without a response","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: fix tx ident leak for commands without a response\n\nCommit 6c3ea155e5ee (\"Bluetooth: L2CAP: Fix not tracking outstanding\nTX ident\") changed ident allocation to use an IDA, releasing idents in\nl2cap_put_ident() when the matching response command is received.\n\nBut identifiers allocated for commands that have no response defined\nare never released. In particular L2CAP_LE_CREDITS is sent repeatedly for\nthe lifetime of an LE CoC channel, so a peer streaming data to the\nhost exhausts the 1-255 ident range after 254 credit packets. From\nthen on l2cap_get_ident() fails:\n\n    kernel: Bluetooth: Unable to allocate ident: -28\n\nand every subsequent L2CAP_LE_CREDITS packet is sent with ident 0,\nwhich is invalid (Core Spec, Vol 3, Part A, Section 4: \"Signaling\nidentifier 0x00 is an invalid identifier and shall never be used in\nany command\"). Remote stacks that validate the ident drop these\ncommands, never receive new credits, and the channel stalls\npermanently. With default socket buffers this happens after roughly 0.5 MB\nof received data (the exact amount depends on the socket receive buffer):\n\n  < ACL Data TX: Handle 2048 flags 0x00 dlen 12\n        LE L2CAP: LE Flow Control Credit (0x16) ident 0 len 4\n          Source CID: 64\n          Credits: 1\n\nRelease the ident immediately after sending L2CAP_LE_CREDITS since no\nresponse will ever release it. Use a local variable instead of\nchan->ident so that an ident that an EXT_FLOWCTL channel may be waiting on\n(e.g. a pending reconfigure) is not overwritten by a credit packet.\n\nAlso add the missing L2CAP_LE_CONN_RSP case to l2cap_put_ident() so\nidents allocated for outgoing L2CAP_LE_CONN_REQ commands are released\nwhen the response arrives.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:22:06","updated_at":"2026-08-17 06:18:36"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/b8a32a5fc915b024c60f18d51b6cffd2bd64d4a6","name":"https://git.kernel.org/stable/c/b8a32a5fc915b024c60f18d51b6cffd2bd64d4a6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6e1930ece855a4c256f1c7e6632d634cfb9888b5","name":"https://git.kernel.org/stable/c/6e1930ece855a4c256f1c7e6632d634cfb9888b5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d0a2b0c81f112540a337cde1c20251bf05ddf1da","name":"https://git.kernel.org/stable/c/d0a2b0c81f112540a337cde1c20251bf05ddf1da","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bd1e01170341291292fd4c46b5f6949da282ca6c","name":"https://git.kernel.org/stable/c/bd1e01170341291292fd4c46b5f6949da282ca6c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0c602cb8f148a36bfb39c25ade400bdadc023c4f","name":"https://git.kernel.org/stable/c/0c602cb8f148a36bfb39c25ade400bdadc023c4f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-72333","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72333","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e86554c37d3d2b4b24608e0313f882cae28b8adb b8a32a5fc915b024c60f18d51b6cffd2bd64d4a6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9b24ad4787cad46a3917620799f8455c6533b8df bd1e01170341291292fd4c46b5f6949da282ca6c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ea6cf86167b3972caa68972d2a1ad43ecbbb8331 0c602cb8f148a36bfb39c25ade400bdadc023c4f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6c3ea155e5ee3e56606233acde8309afda66d483 d0a2b0c81f112540a337cde1c20251bf05ddf1da git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6c3ea155e5ee3e56606233acde8309afda66d483 6e1930ece855a4c256f1c7e6632d634cfb9888b5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ed97bb2cf96684ee646be6f37e4c4835f9d30caa git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 84bc3197f7d87c5b89c156e853d0561a9154eceb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8c1cdbc1bacc0cf9c27c3ebda11a81c3dcd01630 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.18.21 6.18.40 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.10.261 5.11 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.15.212 5.16 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.19.11 6.20 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.0","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"72333","cve":"CVE-2026-72333","epss":"0.002090000","percentile":"0.113530000","score_date":"2026-08-17","updated_at":"2026-08-18 00:11:47"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/bluetooth/l2cap_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"b8a32a5fc915b024c60f18d51b6cffd2bd64d4a6","status":"affected","version":"e86554c37d3d2b4b24608e0313f882cae28b8adb","versionType":"git"},{"lessThan":"bd1e01170341291292fd4c46b5f6949da282ca6c","status":"affected","version":"9b24ad4787cad46a3917620799f8455c6533b8df","versionType":"git"},{"lessThan":"0c602cb8f148a36bfb39c25ade400bdadc023c4f","status":"affected","version":"ea6cf86167b3972caa68972d2a1ad43ecbbb8331","versionType":"git"},{"lessThan":"d0a2b0c81f112540a337cde1c20251bf05ddf1da","status":"affected","version":"6c3ea155e5ee3e56606233acde8309afda66d483","versionType":"git"},{"lessThan":"6e1930ece855a4c256f1c7e6632d634cfb9888b5","status":"affected","version":"6c3ea155e5ee3e56606233acde8309afda66d483","versionType":"git"},{"status":"affected","version":"ed97bb2cf96684ee646be6f37e4c4835f9d30caa","versionType":"git"},{"status":"affected","version":"84bc3197f7d87c5b89c156e853d0561a9154eceb","versionType":"git"},{"status":"affected","version":"8c1cdbc1bacc0cf9c27c3ebda11a81c3dcd01630","versionType":"git"},{"lessThan":"6.18.40","status":"affected","version":"6.18.21","versionType":"semver"},{"lessThan":"5.11","status":"affected","version":"5.10.261","versionType":"semver"},{"lessThan":"5.16","status":"affected","version":"5.15.212","versionType":"semver"},{"lessThan":"6.20","status":"affected","version":"6.19.11","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/bluetooth/l2cap_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"7.0"},{"lessThan":"7.0","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"6.18.21","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"7.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"7.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.261","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.212","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19.11","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: fix tx ident leak for commands without a response\n\nCommit 6c3ea155e5ee (\"Bluetooth: L2CAP: Fix not tracking outstanding\nTX ident\") changed ident allocation to use an IDA, releasing idents in\nl2cap_put_ident() when the matching response command is received.\n\nBut identifiers allocated for commands that have no response defined\nare never released. In particular L2CAP_LE_CREDITS is sent repeatedly for\nthe lifetime of an LE CoC channel, so a peer streaming data to the\nhost exhausts the 1-255 ident range after 254 credit packets. From\nthen on l2cap_get_ident() fails:\n\n    kernel: Bluetooth: Unable to allocate ident: -28\n\nand every subsequent L2CAP_LE_CREDITS packet is sent with ident 0,\nwhich is invalid (Core Spec, Vol 3, Part A, Section 4: \"Signaling\nidentifier 0x00 is an invalid identifier and shall never be used in\nany command\"). Remote stacks that validate the ident drop these\ncommands, never receive new credits, and the channel stalls\npermanently. With default socket buffers this happens after roughly 0.5 MB\nof received data (the exact amount depends on the socket receive buffer):\n\n  < ACL Data TX: Handle 2048 flags 0x00 dlen 12\n        LE L2CAP: LE Flow Control Credit (0x16) ident 0 len 4\n          Source CID: 64\n          Credits: 1\n\nRelease the ident immediately after sending L2CAP_LE_CREDITS since no\nresponse will ever release it. Use a local variable instead of\nchan->ident so that an ident that an EXT_FLOWCTL channel may be waiting on\n(e.g. a pending reconfigure) is not overwritten by a credit packet.\n\nAlso add the missing L2CAP_LE_CONN_RSP case to l2cap_put_ident() so\nidents allocated for outgoing L2CAP_LE_CONN_REQ commands are released\nwhen the response arrives."}],"providerMetadata":{"dateUpdated":"2026-08-17T05:12:40.473Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/b8a32a5fc915b024c60f18d51b6cffd2bd64d4a6"},{"url":"https://git.kernel.org/stable/c/bd1e01170341291292fd4c46b5f6949da282ca6c"},{"url":"https://git.kernel.org/stable/c/0c602cb8f148a36bfb39c25ade400bdadc023c4f"},{"url":"https://git.kernel.org/stable/c/d0a2b0c81f112540a337cde1c20251bf05ddf1da"},{"url":"https://git.kernel.org/stable/c/6e1930ece855a4c256f1c7e6632d634cfb9888b5"}],"title":"Bluetooth: L2CAP: fix tx ident leak for commands without a response","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-72333","datePublished":"2026-08-15T05:55:42.523Z","dateReserved":"2026-08-09T03:40:39.920Z","dateUpdated":"2026-08-17T05:12:40.473Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:22:06","lastModifiedDate":"2026-08-17 06:18:36","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72333","Ordinal":"1","Title":"Bluetooth: L2CAP: fix tx ident leak for commands without a respo","CVE":"CVE-2026-72333","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72333","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: fix tx ident leak for commands without a response\n\nCommit 6c3ea155e5ee (\"Bluetooth: L2CAP: Fix not tracking outstanding\nTX ident\") changed ident allocation to use an IDA, releasing idents in\nl2cap_put_ident() when the matching response command is received.\n\nBut identifiers allocated for commands that have no response defined\nare never released. In particular L2CAP_LE_CREDITS is sent repeatedly for\nthe lifetime of an LE CoC channel, so a peer streaming data to the\nhost exhausts the 1-255 ident range after 254 credit packets. From\nthen on l2cap_get_ident() fails:\n\n    kernel: Bluetooth: Unable to allocate ident: -28\n\nand every subsequent L2CAP_LE_CREDITS packet is sent with ident 0,\nwhich is invalid (Core Spec, Vol 3, Part A, Section 4: \"Signaling\nidentifier 0x00 is an invalid identifier and shall never be used in\nany command\"). Remote stacks that validate the ident drop these\ncommands, never receive new credits, and the channel stalls\npermanently. With default socket buffers this happens after roughly 0.5 MB\nof received data (the exact amount depends on the socket receive buffer):\n\n  < ACL Data TX: Handle 2048 flags 0x00 dlen 12\n        LE L2CAP: LE Flow Control Credit (0x16) ident 0 len 4\n          Source CID: 64\n          Credits: 1\n\nRelease the ident immediately after sending L2CAP_LE_CREDITS since no\nresponse will ever release it. Use a local variable instead of\nchan->ident so that an ident that an EXT_FLOWCTL channel may be waiting on\n(e.g. a pending reconfigure) is not overwritten by a credit packet.\n\nAlso add the missing L2CAP_LE_CONN_RSP case to l2cap_put_ident() so\nidents allocated for outgoing L2CAP_LE_CONN_REQ commands are released\nwhen the response arrives.","Type":"Description","Title":"Bluetooth: L2CAP: fix tx ident leak for commands without a respo"}]}}}