{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64405","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-19T15:36:31.786Z","datePublished":"2026-07-25T08:50:47.262Z","dateUpdated":"2026-08-17T04:55:03.466Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T04:55:03.466Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: Fix null ptr deref in hci_abort_conn()\n\nhci_abort_conn() read hci_skb_event(hdev->sent_cmd) when a connection\nwas pending, but hdev->sent_cmd can be NULL while req_status is still\nHCI_REQ_PEND, leading to a NULL pointer dereference and a general\nprotection fault from the hci_rx_work() receive path.\n\nInstead of inspecting hdev->sent_cmd, track the in-flight create\nconnection command with a new per-connection HCI_CONN_CREATE flag and\nroute all cancellation through hci_cancel_connect_sync(), which\ndispatches to a dedicated per-type cancel function. The create command\nis in exactly one of two states: still queued, or in flight. The cancel\nfunction holds cmd_sync_work_lock across the whole decision: the worker\ntakes this lock to dequeue every entry, so while it is held a queued\ncommand cannot start running and an in-flight command cannot complete\nand let the next command become pending. This keeps the flag test and\nhci_cmd_sync_cancel() atomic with respect to the worker, so a queued\ncommand is simply dequeued, and an in-flight command owned by this\nconnection is cancelled without the risk of cancelling an unrelated\ncommand that became pending in the meantime. CIS uses the same flag\nmechanism via HCI_CONN_CREATE_CIS but cannot be dequeued per-connection.\n\nhci_acl_create_conn_sync() and hci_le_create_conn_sync() clear\nHCI_CONN_CREATE after the create command completes, but the command\nstatus handler can free conn via hci_conn_del() (for example when the\ncontroller rejects the connection) while the worker is still blocked on\nthe connection complete event. Hold a reference on conn across the\ncreate command so the flag can be cleared without a use-after-free."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/net/bluetooth/hci_core.h","net/bluetooth/hci_conn.c","net/bluetooth/hci_sync.c"],"versions":[{"version":"6083089ab00631617f9eac678df3ab050a9d837a","lessThan":"903227b6168bb99fd57d4e3c9c1b5014986198e0","status":"affected","versionType":"git"},{"version":"a13f316e90fdb1fb6df6582e845aa9b3270f3581","lessThan":"83b22d7f7c384564fa42c3cf19bec715c693d7a2","status":"affected","versionType":"git"},{"version":"a13f316e90fdb1fb6df6582e845aa9b3270f3581","lessThan":"70c397b62ee015e19b3924d9da741c8dda017819","status":"affected","versionType":"git"},{"version":"a13f316e90fdb1fb6df6582e845aa9b3270f3581","lessThan":"61701912c58a05f6a043f097cc177a964abef348","status":"affected","versionType":"git"},{"version":"a13f316e90fdb1fb6df6582e845aa9b3270f3581","lessThan":"b42cb640a0493d16b61ddd267420274be15efdc1","status":"affected","versionType":"git"},{"version":"a13f316e90fdb1fb6df6582e845aa9b3270f3581","lessThan":"12917f591cea1af36087dba5b9ec888652f0b42a","status":"affected","versionType":"git"},{"version":"e4511a67fcdba9729d1c7cfc6d2e645c765ce801","status":"affected","versionType":"git"},{"version":"4ab81f16c68a602b2b69e333ae08d8748a9398de","status":"affected","versionType":"git"},{"version":"6.1.83","lessThan":"6.1.118","status":"affected","versionType":"semver"},{"version":"6.4.16","lessThan":"6.5","status":"affected","versionType":"semver"},{"version":"6.5.3","lessThan":"6.6","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/net/bluetooth/hci_core.h","net/bluetooth/hci_conn.c","net/bluetooth/hci_sync.c"],"versions":[{"version":"6.6","status":"affected"},{"version":"0","lessThan":"6.6","status":"unaffected","versionType":"semver"},{"version":"6.1.118","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.145","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.97","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.39","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.4","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":"6.1.83","versionEndExcluding":"6.1.118"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"7.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5.3"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/903227b6168bb99fd57d4e3c9c1b5014986198e0"},{"url":"https://git.kernel.org/stable/c/83b22d7f7c384564fa42c3cf19bec715c693d7a2"},{"url":"https://git.kernel.org/stable/c/70c397b62ee015e19b3924d9da741c8dda017819"},{"url":"https://git.kernel.org/stable/c/61701912c58a05f6a043f097cc177a964abef348"},{"url":"https://git.kernel.org/stable/c/b42cb640a0493d16b61ddd267420274be15efdc1"},{"url":"https://git.kernel.org/stable/c/12917f591cea1af36087dba5b9ec888652f0b42a"}],"title":"Bluetooth: hci_conn: Fix null ptr deref in hci_abort_conn()","x_generator":{"engine":"bippy-1.2.0"}}}}