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).
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Affected Vendors & Products
References
History
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MITRE
Status: PUBLISHED
Assigner: canonical
Published: 2021-06-04T01:40:20.936072Z
Updated: 2024-09-16T22:09:25.883Z
Reserved: 2021-04-09T00:00:00
Link: CVE-2021-3491
Vulnrichment
No data.
NVD
Status : Modified
Published: 2021-06-04T02:15:07.253
Modified: 2024-11-21T06:21:40.063
Link: CVE-2021-3491
Redhat