CVE-2026-68334 rxrpc: fix io_thread race in rxrpc_wake_up_io_thread()
A race condition in the Linux kernel's rxrpc module can cause a null pointer dereference, leading to a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-68334?
CVE-2026-68334 is a vulnerability in Linux, published on 10 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
rxrpc: fix io_thread race in rxrpc_wake_up_io_thread()
rxrpc_wake_up_io_thread() checks local->io_thread before waking it, but then reloads the pointer for wake_up_process().
local->io_thread is cleared with WRITE_ONCE() when the I/O thread exits, so the second load can see NULL even if the first load did not.
Take a READ_ONCE() snapshot and use it for both the NULL check and the wake_up_process() call, as rxrpc_encap_rcv() already does.
Which versions are affected by CVE-2026-68334?
How do I fix CVE-2026-68334?
Apply the vendor's patch.
Is CVE-2026-68334 being exploited?
There is no known exploitation of CVE-2026-68334 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68334, DEBIAN-CVE-2026-68334, GHSA-f247-6x59-q3cw, UBUNTU-CVE-2026-68334.