Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux kernel | affected trunk before v5.13-rc4; affected linux-5.12.y before v5.12.4; affected linux-5.11.y before v5.11.21; affected linux-5.10.y before v5.10.37; affected v5.7-rc1 before 5.7* |
CWE
CWE-131
References
- https://ubuntu.com/security/notices/USN-4950-1
- https://ubuntu.com/security/notices/USN-4949-1
- https://www.openwall.com/lists/oss-security/2021/05/11/13
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d1f82808877bb10d3deee7cf3374a4eb3fb582db
- https://www.zerodayinitiative.com/advisories/ZDI-21-589/
- https://security.netapp.com/advisory/ntap-20210716-0004/
ADP enrichment
No English description supplied.
- https://ubuntu.com/security/notices/USN-4950-1
- https://ubuntu.com/security/notices/USN-4949-1
- https://www.openwall.com/lists/oss-security/2021/05/11/13
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d1f82808877bb10d3deee7cf3374a4eb3fb582db
- https://www.zerodayinitiative.com/advisories/ZDI-21-589/
- https://security.netapp.com/advisory/ntap-20210716-0004/