Linux kernel io_uring PROVIDE_BUFFERS MAX_RW_COUNT bypass
At a glance
Severity
HIGH 7.8
EPSS
EPSS 0.64 % · percentile 51 (2026-10-27)
State
PUBLISHED
Published
Updated
Assigner
canonical
NVD status
Modified
Description
The io_uring subsystem in the Linux kernel allowed the MAX_RW_COUNT limit to be bypassed in the PROVIDE_BUFFERS operation, which led to negative values being usedin mem_rw when reading /proc/<PID>/mem. This could be used to create a heap overflow leading to arbitrary code execution in the kernel. It was addressed via commit d1f82808877b ("io_uring: truncate lengths larger than MAX_RW_COUNT on provide buffers") (v5.13-rc1) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. It was introduced in ddf0322db79c ("io_uring: add IORING_OP_PROVIDE_BUFFERS") (v5.7-rc1).
