Use-after-free in Linux kernel - CVE-2026-98295

Vulnerability details

The vulnerability allows a local user to trigger access to freed kernel memory.

The vulnerability exists due to use-after-free in the Bluetooth coredump processing component when unregistering a controller during an active coredump. A local user can disconnect the controller during the dump to trigger access to freed kernel memory.

The dump_timeout and dump_rx work items remain active after unregistering and can access the device object after hci_release_dev() frees it.

Affected software

How to mitigate CVE-2026-98295

External References

• https://git.kernel.org/stable/c/24af375d7d8aa5f698e4dc41317102f44114351a
• https://git.kernel.org/stable/c/82699d1b727ba5980b94f1eb8dc3d346f41b7c67
• https://git.kernel.org/stable/c/d236517c264e41dc09833c708ef23bccb7a91219
• https://git.kernel.org/stable/c/dcaf10ef27f928568c25de3e9fc242e538de5c67

Related Security Bulletins

• Use-after-free in Linux kernel bluetooth
• Debian update for linux