{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-97975","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-25T10:18:58.207Z","datePublished":"2026-09-25T10:23:13.971Z","dateUpdated":"2026-09-25T10:23:13.971Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-09-25T10:23:13.971Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sysfs: Fix NULL pointer dereference in device_del()\n\nA NULL pointer dereference in klist_put() occurs when a child device (such\nas a BNEP network device in bnep_session) is concurrently being\nunregistered while hci_conn_del_sysfs() reparents child devices.\n\nThis is caused by a race condition between hci_conn_del_sysfs() and\nconcurrent child device unregistration (e.g. bnep_session calling\nunregister_netdev()). During device unregistration, device_del() snapshots\na non-NULL parent pointer. Concurrently, hci_conn_del_sysfs() finds the\nchild device using device_find_any_child() and calls device_move() to\nreparent it to NULL, which removes the node from its parent's klist and\nclears knode_parent. Subsequently, device_del() calls\nklist_del(&dev->p->knode_parent) using the stale parent snapshot, causing\nklist_put() to dereference knode_klist(n)->put on an already removed node,\nresulting in a NULL pointer dereference.\n\nThis race was introduced by commit 27aabf27fd01 (\"Bluetooth: fix\nuse-after-free in device_for_each_child()\"), which replaced\ndevice_find_child(..., __match_tty) with device_find_any_child() in\nhci_conn_del_sysfs(). That change was intended to avoid a use-after-free\nwhere conn->dev outlived its parent hdev->dev when child devices held\nreferences to conn->dev, because conn->dev only held a reference to\nhdev->dev while registered in sysfs.\n\nFix the issue properly by taking an explicit reference to the parent device\nwith get_device(&hdev->dev) in hci_conn_init_sysfs() and dropping it with\nput_device(parent) in bt_link_release() when the conn device is freed. This\nensures that hdev->dev remains valid for the entire lifecycle of conn->dev,\nresolving the underlying use-after-free. With the parent reference held\nproperly, restore the __match_tty filter in hci_conn_del_sysfs() so that\ndevice_move() is only invoked on persistent RFCOMM TTY devices as\noriginally intended, eliminating the race condition with unregistering\nnetwork devices."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_sysfs.c"],"versions":[{"version":"27aabf27fd014ae037cc179c61b0bee7cff55b3d","lessThan":"eeabdb25c3209569367e99a85ca9a503b64a646d","status":"affected","versionType":"git"},{"version":"27aabf27fd014ae037cc179c61b0bee7cff55b3d","lessThan":"9e9ece97b8e716890793de261574b8efef7d8702","status":"affected","versionType":"git"},{"version":"27aabf27fd014ae037cc179c61b0bee7cff55b3d","lessThan":"9b851b09b392da68bd715601f10a5adb2d8d19b8","status":"affected","versionType":"git"},{"version":"6894717a1ea363c5a27010ba604f957c309d282d","status":"affected","versionType":"git"},{"version":"fb91ce37dc9a37ea23cf32b6d7b667004e93d4c5","status":"affected","versionType":"git"},{"version":"a9584c897d1cba6265c78010bbb45ca5722c88bc","status":"affected","versionType":"git"},{"version":"0f67ca2a80acf8b207240405b7f72d660665d3df","status":"affected","versionType":"git"},{"version":"de5a44f351ca7efd9add9851b218f5353e2224b7","status":"affected","versionType":"git"},{"version":"91e2a2e4d1336333804cd31162984f01ad8cc70f","status":"affected","versionType":"git"},{"version":"7b277bd569bb6a2777f0014f84b4344f444fd49d","status":"affected","versionType":"git"},{"version":"5.4.297","lessThan":"5.5","status":"affected","versionType":"semver"},{"version":"5.10.231","lessThan":"5.11","status":"affected","versionType":"semver"},{"version":"5.15.174","lessThan":"5.16","status":"affected","versionType":"semver"},{"version":"6.1.120","lessThan":"6.2","status":"affected","versionType":"semver"},{"version":"6.6.64","lessThan":"6.7","status":"affected","versionType":"semver"},{"version":"6.11.11","lessThan":"6.12","status":"affected","versionType":"semver"},{"version":"6.12.2","lessThan":"6.13","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_sysfs.c"],"versions":[{"version":"6.13","status":"affected"},{"version":"0","lessThan":"6.13","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.7","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3-rc3","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":"6.13","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"7.2.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"7.3-rc3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.297"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.231"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.174"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.120"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.64"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/eeabdb25c3209569367e99a85ca9a503b64a646d"},{"url":"https://git.kernel.org/stable/c/9e9ece97b8e716890793de261574b8efef7d8702"},{"url":"https://git.kernel.org/stable/c/9b851b09b392da68bd715601f10a5adb2d8d19b8"}],"title":"Bluetooth: hci_sysfs: Fix NULL pointer dereference in device_del()","x_generator":{"engine":"bippy-1.2.0"}}}}