{"api_version":"1","generated_at":"2026-07-22T04:36:30+00:00","cve":"CVE-2026-63976","urls":{"html":"https://cve.report/CVE-2026-63976","api":"https://cve.report/api/cve/CVE-2026-63976.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-63976","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63976"},"summary":{"title":"Bluetooth: l2cap: clear chan->ident on ECRED reconfiguration success","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: l2cap: clear chan->ident on ECRED reconfiguration success\n\nl2cap_ecred_reconf_rsp() returns early on success without clearing\nchan->ident. Every other L2CAP response handler (l2cap_ecred_conn_rsp,\nl2cap_le_connect_rsp, l2cap_config_rsp) clears chan->ident after a\nsuccessful transaction to prevent the channel from matching subsequent\nresponses with the recycled ident value.\n\nA remote attacker that completed a reconfiguration as the peer can\nreplay a failure response with the stale ident, causing the kernel to\nmatch and destroy the already-established channel via\nl2cap_chan_del(chan, ECONNRESET).\n\nClear chan->ident for all matching channels on success, and harden the\nfailure path by using l2cap_chan_hold_unless_zero() consistent with\nother L2CAP handlers (l2cap_le_command_rej, __l2cap_get_chan_by_ident).","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:16","updated_at":"2026-07-20 15:16:59"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"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","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/3b5b5f423b4fd23404a393bda8adba3cd6f74ef1","name":"https://git.kernel.org/stable/c/3b5b5f423b4fd23404a393bda8adba3cd6f74ef1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/59f5ecf6ad5c4db6ae81965a96156954a3b0d89a","name":"https://git.kernel.org/stable/c/59f5ecf6ad5c4db6ae81965a96156954a3b0d89a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/00e1950716c6ed67d74777b2db286b0fa23b4be9","name":"https://git.kernel.org/stable/c/00e1950716c6ed67d74777b2db286b0fa23b4be9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c2afd2613fda90107c5e2fe8e855627451749c78","name":"https://git.kernel.org/stable/c/c2afd2613fda90107c5e2fe8e855627451749c78","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ae0152d77d101c920769934fb102b18de0c6f526","name":"https://git.kernel.org/stable/c/ae0152d77d101c920769934fb102b18de0c6f526","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f39049304ba655ffcbb92edbdf8c51a1f1210bed","name":"https://git.kernel.org/stable/c/f39049304ba655ffcbb92edbdf8c51a1f1210bed","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8e7977afaef37c6bd2b2654f1bce6ab40d471147","name":"https://git.kernel.org/stable/c/8e7977afaef37c6bd2b2654f1bce6ab40d471147","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cc2b4f749de09975bfa06e58bbbad2f6acd4c79c","name":"https://git.kernel.org/stable/c/cc2b4f749de09975bfa06e58bbbad2f6acd4c79c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63976","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63976","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 15f02b91056253e8cdc592888f431da0731337b8 59f5ecf6ad5c4db6ae81965a96156954a3b0d89a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 15f02b91056253e8cdc592888f431da0731337b8 ae0152d77d101c920769934fb102b18de0c6f526 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 15f02b91056253e8cdc592888f431da0731337b8 c2afd2613fda90107c5e2fe8e855627451749c78 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 15f02b91056253e8cdc592888f431da0731337b8 cc2b4f749de09975bfa06e58bbbad2f6acd4c79c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 15f02b91056253e8cdc592888f431da0731337b8 3b5b5f423b4fd23404a393bda8adba3cd6f74ef1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 15f02b91056253e8cdc592888f431da0731337b8 f39049304ba655ffcbb92edbdf8c51a1f1210bed git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 15f02b91056253e8cdc592888f431da0731337b8 8e7977afaef37c6bd2b2654f1bce6ab40d471147 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 15f02b91056253e8cdc592888f431da0731337b8 00e1950716c6ed67d74777b2db286b0fa23b4be9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.7","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.7 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.259 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.210 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.176 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.143 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.93 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.35 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.12 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"63976","cve":"CVE-2026-63976","epss":"0.003090000","percentile":"0.229660000","score_date":"2026-07-20","updated_at":"2026-07-21 00:13:13"},"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":"59f5ecf6ad5c4db6ae81965a96156954a3b0d89a","status":"affected","version":"15f02b91056253e8cdc592888f431da0731337b8","versionType":"git"},{"lessThan":"ae0152d77d101c920769934fb102b18de0c6f526","status":"affected","version":"15f02b91056253e8cdc592888f431da0731337b8","versionType":"git"},{"lessThan":"c2afd2613fda90107c5e2fe8e855627451749c78","status":"affected","version":"15f02b91056253e8cdc592888f431da0731337b8","versionType":"git"},{"lessThan":"cc2b4f749de09975bfa06e58bbbad2f6acd4c79c","status":"affected","version":"15f02b91056253e8cdc592888f431da0731337b8","versionType":"git"},{"lessThan":"3b5b5f423b4fd23404a393bda8adba3cd6f74ef1","status":"affected","version":"15f02b91056253e8cdc592888f431da0731337b8","versionType":"git"},{"lessThan":"f39049304ba655ffcbb92edbdf8c51a1f1210bed","status":"affected","version":"15f02b91056253e8cdc592888f431da0731337b8","versionType":"git"},{"lessThan":"8e7977afaef37c6bd2b2654f1bce6ab40d471147","status":"affected","version":"15f02b91056253e8cdc592888f431da0731337b8","versionType":"git"},{"lessThan":"00e1950716c6ed67d74777b2db286b0fa23b4be9","status":"affected","version":"15f02b91056253e8cdc592888f431da0731337b8","versionType":"git"}]},{"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":"5.7"},{"lessThan":"5.7","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.259","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.210","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.176","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.143","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.93","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.35","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.12","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.259","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.210","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.176","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.143","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.93","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.35","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.12","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"5.7","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: l2cap: clear chan->ident on ECRED reconfiguration success\n\nl2cap_ecred_reconf_rsp() returns early on success without clearing\nchan->ident. Every other L2CAP response handler (l2cap_ecred_conn_rsp,\nl2cap_le_connect_rsp, l2cap_config_rsp) clears chan->ident after a\nsuccessful transaction to prevent the channel from matching subsequent\nresponses with the recycled ident value.\n\nA remote attacker that completed a reconfiguration as the peer can\nreplay a failure response with the stale ident, causing the kernel to\nmatch and destroy the already-established channel via\nl2cap_chan_del(chan, ECONNRESET).\n\nClear chan->ident for all matching channels on success, and harden the\nfailure path by using l2cap_chan_hold_unless_zero() consistent with\nother L2CAP handlers (l2cap_le_command_rej, __l2cap_get_chan_by_ident)."}],"metrics":[{"cvssV3_1":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-07-20T13:42:00.067Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/59f5ecf6ad5c4db6ae81965a96156954a3b0d89a"},{"url":"https://git.kernel.org/stable/c/ae0152d77d101c920769934fb102b18de0c6f526"},{"url":"https://git.kernel.org/stable/c/c2afd2613fda90107c5e2fe8e855627451749c78"},{"url":"https://git.kernel.org/stable/c/cc2b4f749de09975bfa06e58bbbad2f6acd4c79c"},{"url":"https://git.kernel.org/stable/c/3b5b5f423b4fd23404a393bda8adba3cd6f74ef1"},{"url":"https://git.kernel.org/stable/c/f39049304ba655ffcbb92edbdf8c51a1f1210bed"},{"url":"https://git.kernel.org/stable/c/8e7977afaef37c6bd2b2654f1bce6ab40d471147"},{"url":"https://git.kernel.org/stable/c/00e1950716c6ed67d74777b2db286b0fa23b4be9"}],"title":"Bluetooth: l2cap: clear chan->ident on ECRED reconfiguration success","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-63976","datePublished":"2026-07-19T14:56:01.284Z","dateReserved":"2026-07-19T07:54:57.024Z","dateUpdated":"2026-07-20T13:42:00.067Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 16:17:16","lastModifiedDate":"2026-07-20 15:16:59","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"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","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"63976","Ordinal":"1","Title":"Bluetooth: l2cap: clear chan->ident on ECRED reconfiguration suc","CVE":"CVE-2026-63976","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"63976","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: l2cap: clear chan->ident on ECRED reconfiguration success\n\nl2cap_ecred_reconf_rsp() returns early on success without clearing\nchan->ident. Every other L2CAP response handler (l2cap_ecred_conn_rsp,\nl2cap_le_connect_rsp, l2cap_config_rsp) clears chan->ident after a\nsuccessful transaction to prevent the channel from matching subsequent\nresponses with the recycled ident value.\n\nA remote attacker that completed a reconfiguration as the peer can\nreplay a failure response with the stale ident, causing the kernel to\nmatch and destroy the already-established channel via\nl2cap_chan_del(chan, ECONNRESET).\n\nClear chan->ident for all matching channels on success, and harden the\nfailure path by using l2cap_chan_hold_unless_zero() consistent with\nother L2CAP handlers (l2cap_le_command_rej, __l2cap_get_chan_by_ident).","Type":"Description","Title":"Bluetooth: l2cap: clear chan->ident on ECRED reconfiguration suc"}]}}}