{"api_version":"1","generated_at":"2026-08-08T21:28:47+00:00","cve":"CVE-2026-64404","urls":{"html":"https://cve.report/CVE-2026-64404","api":"https://cve.report/api/cve/CVE-2026-64404.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64404","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64404"},"summary":{"title":"Bluetooth: ISO: avoid NULL deref of conn in iso_conn_big_sync()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: avoid NULL deref of conn in iso_conn_big_sync()\n\niso_conn_big_sync() drops the socket lock to call hci_get_route() and\nthen re-acquires it, but dereferences iso_pi(sk)->conn->hcon afterwards\nwithout re-checking that conn is still valid.\n\nWhile the lock is dropped, the connection can be torn down under the\nsame socket lock: iso_disconn_cfm() -> iso_conn_del() -> iso_chan_del()\nsets iso_pi(sk)->conn to NULL (and the broadcast teardown path can also\nclear conn->hcon on its own). When iso_conn_big_sync() re-acquires the\nlock and reads conn->hcon, conn may be NULL, causing a NULL pointer\ndereference (hcon is the first member of struct iso_conn).\n\nThis path is reached from iso_sock_recvmsg() for a PA-sync broadcast\nsink socket (BT_SK_DEFER_SETUP | BT_SK_PA_SYNC), so the dropped-lock\nwindow can race with connection teardown driven by controller events.\n\nRe-validate iso_pi(sk)->conn and its hcon after re-acquiring the socket\nlock and bail out if the connection went away, as already done in the\nsibling iso_sock_rebind_bc().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-25 10:17:24","updated_at":"2026-07-25 10:17:24"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/b3e647a4aa4d2d054f86a783f5c426035e1dc237","name":"https://git.kernel.org/stable/c/b3e647a4aa4d2d054f86a783f5c426035e1dc237","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/01afd198c2c286cd3b81f44d4e33a2e638711550","name":"https://git.kernel.org/stable/c/01afd198c2c286cd3b81f44d4e33a2e638711550","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d5541eb148da72d5e0a1bca8ecd171f9fc8b366f","name":"https://git.kernel.org/stable/c/d5541eb148da72d5e0a1bca8ecd171f9fc8b366f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b84eeb7636d6962dd882d5e0b31475e4f404313c","name":"https://git.kernel.org/stable/c/b84eeb7636d6962dd882d5e0b31475e4f404313c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64404","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64404","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cbe640d6cae590b9a7d81ce86fe9a90e83eec1d5 b3e647a4aa4d2d054f86a783f5c426035e1dc237 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7a17308c17880d259105f6e591eb1bc77b9612f0 b84eeb7636d6962dd882d5e0b31475e4f404313c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7a17308c17880d259105f6e591eb1bc77b9612f0 01afd198c2c286cd3b81f44d4e33a2e638711550 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7a17308c17880d259105f6e591eb1bc77b9612f0 d5541eb148da72d5e0a1bca8ecd171f9fc8b366f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12.6 6.12.96 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.13","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.13 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.96 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.39 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.4 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"64404","cve":"CVE-2026-64404","epss":"0.001680000","percentile":"0.064600000","score_date":"2026-07-28","updated_at":"2026-07-29 00:05:33"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/bluetooth/iso.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"b3e647a4aa4d2d054f86a783f5c426035e1dc237","status":"affected","version":"cbe640d6cae590b9a7d81ce86fe9a90e83eec1d5","versionType":"git"},{"lessThan":"b84eeb7636d6962dd882d5e0b31475e4f404313c","status":"affected","version":"7a17308c17880d259105f6e591eb1bc77b9612f0","versionType":"git"},{"lessThan":"01afd198c2c286cd3b81f44d4e33a2e638711550","status":"affected","version":"7a17308c17880d259105f6e591eb1bc77b9612f0","versionType":"git"},{"lessThan":"d5541eb148da72d5e0a1bca8ecd171f9fc8b366f","status":"affected","version":"7a17308c17880d259105f6e591eb1bc77b9612f0","versionType":"git"},{"lessThan":"6.12.96","status":"affected","version":"6.12.6","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/bluetooth/iso.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.13"},{"lessThan":"6.13","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.96","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.39","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.96","versionStartIncluding":"6.12.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.39","versionStartIncluding":"6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.4","versionStartIncluding":"6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc3","versionStartIncluding":"6.13","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: avoid NULL deref of conn in iso_conn_big_sync()\n\niso_conn_big_sync() drops the socket lock to call hci_get_route() and\nthen re-acquires it, but dereferences iso_pi(sk)->conn->hcon afterwards\nwithout re-checking that conn is still valid.\n\nWhile the lock is dropped, the connection can be torn down under the\nsame socket lock: iso_disconn_cfm() -> iso_conn_del() -> iso_chan_del()\nsets iso_pi(sk)->conn to NULL (and the broadcast teardown path can also\nclear conn->hcon on its own). When iso_conn_big_sync() re-acquires the\nlock and reads conn->hcon, conn may be NULL, causing a NULL pointer\ndereference (hcon is the first member of struct iso_conn).\n\nThis path is reached from iso_sock_recvmsg() for a PA-sync broadcast\nsink socket (BT_SK_DEFER_SETUP | BT_SK_PA_SYNC), so the dropped-lock\nwindow can race with connection teardown driven by controller events.\n\nRe-validate iso_pi(sk)->conn and its hcon after re-acquiring the socket\nlock and bail out if the connection went away, as already done in the\nsibling iso_sock_rebind_bc()."}],"providerMetadata":{"dateUpdated":"2026-07-25T08:50:46.523Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/b3e647a4aa4d2d054f86a783f5c426035e1dc237"},{"url":"https://git.kernel.org/stable/c/b84eeb7636d6962dd882d5e0b31475e4f404313c"},{"url":"https://git.kernel.org/stable/c/01afd198c2c286cd3b81f44d4e33a2e638711550"},{"url":"https://git.kernel.org/stable/c/d5541eb148da72d5e0a1bca8ecd171f9fc8b366f"}],"title":"Bluetooth: ISO: avoid NULL deref of conn in iso_conn_big_sync()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64404","datePublished":"2026-07-25T08:50:46.523Z","dateReserved":"2026-07-19T15:36:31.785Z","dateUpdated":"2026-07-25T08:50:46.523Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-25 10:17:24","lastModifiedDate":"2026-07-25 10:17:24","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64404","Ordinal":"1","Title":"Bluetooth: ISO: avoid NULL deref of conn in iso_conn_big_sync()","CVE":"CVE-2026-64404","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64404","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: avoid NULL deref of conn in iso_conn_big_sync()\n\niso_conn_big_sync() drops the socket lock to call hci_get_route() and\nthen re-acquires it, but dereferences iso_pi(sk)->conn->hcon afterwards\nwithout re-checking that conn is still valid.\n\nWhile the lock is dropped, the connection can be torn down under the\nsame socket lock: iso_disconn_cfm() -> iso_conn_del() -> iso_chan_del()\nsets iso_pi(sk)->conn to NULL (and the broadcast teardown path can also\nclear conn->hcon on its own). When iso_conn_big_sync() re-acquires the\nlock and reads conn->hcon, conn may be NULL, causing a NULL pointer\ndereference (hcon is the first member of struct iso_conn).\n\nThis path is reached from iso_sock_recvmsg() for a PA-sync broadcast\nsink socket (BT_SK_DEFER_SETUP | BT_SK_PA_SYNC), so the dropped-lock\nwindow can race with connection teardown driven by controller events.\n\nRe-validate iso_pi(sk)->conn and its hcon after re-acquiring the socket\nlock and bail out if the connection went away, as already done in the\nsibling iso_sock_rebind_bc().","Type":"Description","Title":"Bluetooth: ISO: avoid NULL deref of conn in iso_conn_big_sync()"}]}}}