{ "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": "2026-10-21T12:53:55.330Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:53:55.330Z" }, "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": "de5a44f351ca7efd9add9851b218f5353e2224b7", "lessThan": "55b76500546e5f2e7fdd7ae7283530b620de6e61", "status": "affected", "versionType": "git" }, { "version": "7b277bd569bb6a2777f0014f84b4344f444fd49d", "lessThan": "66cc55b69928b742d24b4c5b66d195ae96900e48", "status": "affected", "versionType": "git" }, { "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": "91e2a2e4d1336333804cd31162984f01ad8cc70f", "status": "affected", "versionType": "git" }, { "version": "6.6.64", "lessThan": "6.6.160", "status": "affected", "versionType": "semver" }, { "version": "6.12.2", "lessThan": "6.12.114", "status": "affected", "versionType": "semver" }, { "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": "6.11.11", "lessThan": "6.12", "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": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.114", "lessThanOrEqual": "6.12.*", "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", "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": "6.6.64", "versionEndExcluding": "6.6.160" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.2", "versionEndExcluding": "6.12.114" }, { "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" }, { "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": "6.11.11" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/55b76500546e5f2e7fdd7ae7283530b620de6e61" }, { "url": "https://git.kernel.org/stable/c/66cc55b69928b742d24b4c5b66d195ae96900e48" }, { "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" } } } }