A flaw was found in the fixed buffer registration code for io_uring (io_sqe_buffer_register in io_uring/rsrc.c) in the Linux kernel that allows out-of-bounds access to physical memory beyond the end of the buffer. This flaw enables full local privilege escalation.
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
The product writes data past the end, or before the beginning, of the intended buffer.
| Link | Tags |
|---|---|
| https://www.openwall.com/lists/oss-security/2023/05/08/3 | third party advisory mailing list |
| https://security.netapp.com/advisory/ntap-20230703-0006/ | third party advisory |
| http://www.openwall.com/lists/oss-security/2024/04/24/3 | mailing list |