7.8
High
CVE-2021-3491 The io_uring subsystem in the Linux kernel allowed the MAX_RW_COUNT limit to be bypassed in the PROVIDE_BUFFERS…
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).
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Kernel 5.13 | earliest → < 5.13-rc4 | 5.13-rc4 |
| Linux Kernel 5.12 | earliest → < 5.12.4 | 5.12.4 |
| Linux Kernel 5.11 | earliest → < 5.11.21 | 5.11.21 |
| Linux Kernel 5.10 | earliest → < 5.10.37 | 5.10.37 |
| Linux Kernel 5.7 | 5.7-rc1 → latest | No fix stated |
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