CVE-2025-38504 io_uring/zcrx: fix pp destruction warnings
A logic error in the Linux kernel's io_uring zero-copy receive path can trigger warnings and potential instability during page pool destruction.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-38504?
CVE-2025-38504 is a medium-severity vulnerability in Linux kernel, published on 16 Aug 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
io_uring/zcrx: fix pp destruction warnings
With multiple page pools and in some other cases we can have allocated niovs on page pool destruction. Remove a misplaced warning checking that all niovs are returned to zcrx on io_pp_zc_destroy(). It was reported before but apparently got lost.
Which versions are affected by CVE-2025-38504?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-38504?
Apply the vendor's patch.
Is CVE-2025-38504 being exploited?
There is no known exploitation of CVE-2025-38504 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-38504, GHSA-6fwg-c2rw-7c32, UBUNTU-CVE-2025-38504.