Kernel use-after-free via unsynchronized DVB removal
Published Nov 25, 2022 · Updated Aug 3, 2024
A race condition in Linux kernel 6.0.9 and earlier allows local users to trigger a use-after-free in the DVB network driver. The dvb_device_open path fails to check dvbnet->exit and lacks removal locking, so it can open a DVB network device while disconnect frees its state. Exploitation requires low-privileged local access, precise timing, and physical disconnection of a DVB device; the stale access exposes freed kernel memory and can disrupt the host.
Summary
What happened
A race condition in Linux kernel 6.0.9 and earlier allows local users to trigger a use-after-free in the DVB network driver. The dvb_device_open path fails to check dvbnet->exit and lacks removal locking, so it can open a DVB network device while disconnect frees its state. Exploitation requires low-privileged local access, precise timing, and physical disconnection of a DVB device; the stale access exposes freed kernel memory and can disrupt the host.
The record
- CVE
- CVE-2022-45886
- Published
- Nov 25, 2022
- Updated
- Aug 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-416, CWE-362
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Nov 25, 2022CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
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Attacks
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