CVE-2025-37918
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2025-37918
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-37918.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2025-37918
- Downstream
- Related
- Published
- 2025-05-20T15:21:48Z
- Modified
- 2025-10-22T12:12:36.313570Z
- Summary
- Bluetooth: btusb: avoid NULL pointer dereference in skb_dequeue()
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: btusb: avoid NULL pointer dereference in skb_dequeue()
A NULL pointer dereference can occur in skb_dequeue() when processing a QCA firmware crash dump on WCN7851 (0489:e0f3).
[ 93.672166] Bluetooth: hci0: ACL memdump size(589824)
[ 93.672475] BUG: kernel NULL pointer dereference, address: 0000000000000008 [ 93.672517] Workqueue: hci0 hcidevcdrx [bluetooth] [ 93.672598] RIP: 0010:skb_dequeue+0x50/0x80
The issue stems from handledumppktqca() returning 0 even when a dump packet is successfully processed. This is because it incorrectly forwards the return value of hcidevcdinit() (which returns 0 on success). As a result, the caller (btusbrecvaclqca() or btusbrecvevtqca()) assumes the packet was not handled and passes it to hcirecv_frame(), leading to premature kfree() of the skb.
Later, hcidevcdrx() attempts to dequeue the same skb from the dump queue, resulting in a NULL pointer dereference.
Fix this by: 1. Making handledumppkt_qca() return 0 on success and negative errno on failure, consistent with kernel conventions. 2. Splitting dump packet detection into separate functions for ACL and event packets for better structure and readability.
This ensures dump packets are properly identified and consumed, avoiding double handling and preventing NULL pointer access.
- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/0317b033abcd1d8dd2798f0e2de5e84543d0bd22
- https://git.kernel.org/stable/c/2e8d44ebaa7babdd5c5ab50ca275826e241920d6
- https://git.kernel.org/stable/c/8563d9fabd8a4b726ba7acab4737c438bf11a059
- https://git.kernel.org/stable/c/b70b41591ec48c78ec6a885e1f57bfc4029e5e13
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced20981ce2d5a5f79d17da1ace3a93df7b3c6ba3d6Fixed2e8d44ebaa7babdd5c5ab50ca275826e241920d6
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced20981ce2d5a5f79d17da1ace3a93df7b3c6ba3d6Fixedb70b41591ec48c78ec6a885e1f57bfc4029e5e13
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced20981ce2d5a5f79d17da1ace3a93df7b3c6ba3d6Fixed8563d9fabd8a4b726ba7acab4737c438bf11a059
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced20981ce2d5a5f79d17da1ace3a93df7b3c6ba3d6Fixed0317b033abcd1d8dd2798f0e2de5e84543d0bd22