An issue was discovered in aio_poll() in fs/aio.c in the Linux kernel through 5.0.4. A file may be released by aio_poll_wake() if an expected event is triggered immediately (e.g., by the close of a pair of pipes) after the return of vfs_poll(), and this will cause a use-after-free.
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
| Link | Tags |
|---|---|
| https://patchwork.kernel.org/patch/10828359/ | patch vendor advisory exploit |
| http://www.securityfocus.com/bid/107655 | third party advisory vdb entry |
| https://security.netapp.com/advisory/ntap-20190411-0003/ | third party advisory |
| https://support.f5.com/csp/article/K29215970 | third party advisory |