Bluetooth: hci_sysfs: Fix NULL pointer dereference in device_del()
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sysfs: Fix NULL pointer dereference in device_del() A NULL pointer dereference in klist_put() occurs when a child device (such as a BNEP network device in bnep_session) is concurrently being unregistered while hci_conn_del_sysfs() reparents child devices. This is caused by a race condition between hci_conn_del_sysfs() and concurrent child device unregistration (e.g. bnep_session calling unregister_netdev()). During device unregistration, device_del() snapshots a non-NULL parent pointer. Concurrently, hci_conn_del_sysfs() finds the child device using device_find_any_child() and calls device_move() to reparent it to NULL, which removes the node from its parent's klist and clears knode_parent. Subsequently, device_del() calls klist_del(&dev->p->knode_parent) using the stale parent snapshot, causing klist_put() to dereference knode_klist(n)->put on an already removed node, resulting in a NULL pointer dereference. This race was introduced by commit 27aabf27fd01 ("Bluetooth: fix use-after-free in device_for_each_child()"), which replaced device_find_child(..., __match_tty) with device_find_any_child() in hci_conn_del_sysfs(). That change was intended to avoid a use-after-free where conn->dev outlived its parent hdev->dev when child devices held references to conn->dev, because conn->dev only held a reference to hdev->dev while registered in sysfs. Fix the issue properly by taking an explicit referenc
CVE-2026-97975
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-97975
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "de5a44f351ca7efd9add9851b218f5353e2224b7",
"lessThan": "55b76500546e5f2e7fdd7ae7283530b620de6e61",
"versionType": "git"
},
{
"status": "affected",
"version": "7b277bd569bb6a2777f0014f84b4344f444fd49d",
"lessThan": "66cc55b69928b742d24b4c5b66d195ae96900e48",
"versionType": "git"
},
{
"status": "affected",
"version": "27aabf27fd014ae037cc179c61b0bee7cff55b3d",
"lessThan": "eeabdb25c3209569367e99a85ca9a503b64a646d",
"versionType": "git"
},
{
"status": "affected",
"version": "27aabf27fd014ae037cc179c61b0bee7cff55b3d",
"lessThan": "9e9ece97b8e716890793de261574b8efef7d8702",
"versionType": "git"
},
{
"status": "affected",
"version": "27aabf27fd014ae037cc179c61b0bee7cff55b3d",
"lessThan": "9b851b09b392da68bd715601f10a5adb2d8d19b8",
"versionType": "git"
},
{
"status": "affected",
"version": "6894717a1ea363c5a27010ba604f957c309d282d",
"versionType": "git"
},
{
"status": "affected",
"version": "fb91ce37dc9a37ea23cf32b6d7b667004e93d4c5",
"versionType": "git"
},
{
"status": "affected",
"version": "a9584c897d1cba6265c78010bbb45ca5722c88bc",
"versionType": "git"
},
{
"status": "affected",
"version": "0f67ca2a80acf8b207240405b7f72d660665d3df",
"versionType": "git"
},
{
"status": "affected",
"version": "91e2a2e4d1336333804cd31162984f01ad8cc70f",
"versionType": "git"
},
{
"status": "affected",
"version": "6.6.64",
"lessThan": "6.6.160",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.12.2",
"lessThan": "6.12.114",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.4.297",
"lessThan": "5.5",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.10.231",
"lessThan": "5.11",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.174",
"lessThan": "5.16",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.120",
"lessThan": "6.2",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.11.11",
"lessThan": "6.12",
"versionType": "semver"
}
],
"programFiles": [
"net/bluetooth/hci_sysfs.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.7",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/bluetooth/hci_sysfs.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-97975
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48820 · Revision 1
- Added to Heist Feed
- Publisher date