Concurrent removals of certain anonymous shared memory mappings by using the UMTX_SHM_DESTROY sub-request of UMTX_OP_SHM can lead to decreasing the reference count of the object representing the mapping too many times, causing it to be freed too early.
A malicious code exercizing the UMTX_SHM_DESTROY sub-request in parallel can panic the kernel or enable further Use-After-Free attacks, potentially including code execution or Capsicum sandbox escape.
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 Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Freebsd | Freebsd | 13.0 (including) | 13.3 (excluding) |
| Freebsd | Freebsd | 13.3 (including) | 13.3 (including) |
| Freebsd | Freebsd | 13.3-p1 (including) | 13.3-p1 (including) |
| Freebsd | Freebsd | 13.3-p2 (including) | 13.3-p2 (including) |
| Freebsd | Freebsd | 13.3-p3 (including) | 13.3-p3 (including) |
| Freebsd | Freebsd | 13.3-p4 (including) | 13.3-p4 (including) |
| Freebsd | Freebsd | 13.3-p5 (including) | 13.3-p5 (including) |
| Freebsd | Freebsd | 13.4-beta3 (including) | 13.4-beta3 (including) |
| Freebsd | Freebsd | 14.0 (including) | 14.0 (including) |
| Freebsd | Freebsd | 14.0-beta5 (including) | 14.0-beta5 (including) |
| Freebsd | Freebsd | 14.0-p1 (including) | 14.0-p1 (including) |
| Freebsd | Freebsd | 14.0-p2 (including) | 14.0-p2 (including) |
| Freebsd | Freebsd | 14.0-p3 (including) | 14.0-p3 (including) |
| Freebsd | Freebsd | 14.0-p4 (including) | 14.0-p4 (including) |
| Freebsd | Freebsd | 14.0-p5 (including) | 14.0-p5 (including) |
| Freebsd | Freebsd | 14.0-p6 (including) | 14.0-p6 (including) |
| Freebsd | Freebsd | 14.0-p7 (including) | 14.0-p7 (including) |
| Freebsd | Freebsd | 14.0-p8 (including) | 14.0-p8 (including) |
| Freebsd | Freebsd | 14.0-p9 (including) | 14.0-p9 (including) |
| Freebsd | Freebsd | 14.0-rc3 (including) | 14.0-rc3 (including) |
| Freebsd | Freebsd | 14.0-rc4-p1 (including) | 14.0-rc4-p1 (including) |
| Freebsd | Freebsd | 14.1 (including) | 14.1 (including) |
| Freebsd | Freebsd | 14.1-p1 (including) | 14.1-p1 (including) |
| Freebsd | Freebsd | 14.1-p2 (including) | 14.1-p2 (including) |
| Freebsd | Freebsd | 14.1-p3 (including) | 14.1-p3 (including) |