Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: Fix use-after-free race condition for maps It is possible that in between calling fastrpc_map_get() until map->fl->lock is taken in fastrpc_free_map(), another thread can call fastrpc_map_lookup() and get a reference to a map that is about to be deleted. Rewrite fastrpc_map_get() to only increase the reference count of a map if it's non-zero. Propagate this to callers so they can know if a map is about to be deleted. Fixes this warning: refcount_t: addition on 0; use-after-free. WARNING: CPU: 5 PID: 10100 at lib/refcount.c:25 refcount_warn_saturate ... Call trace: refcount_warn_saturate [fastrpc_map_get inlined] [fastrpc_map_lookup inlined] fastrpc_map_create fastrpc_internal_invoke fastrpc_device_ioctl __arm64_sys_ioctl invoke_syscall
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected c68cfb718c8f97b7f7a50ed66be5feb42d0c8988 before 556dfdb226ce1e5231d8836159b23f8bb0395bf4; affected c68cfb718c8f97b7f7a50ed66be5feb42d0c8988 before b171d0d2cf1b8387c72c8d325c5d5746fa271e39; affected c68cfb718c8f97b7f7a50ed66be5feb42d0c8988 before 61a0890cb95afec5c8a2f4a879de2b6220984ef1; affected c68cfb718c8f97b7f7a50ed66be5feb42d0c8988 before 079c78c68714f7d8d58e66c477b0243b31806907; affected c68cfb718c8f97b7f7a50ed66be5feb42d0c8988 before 96b328d119eca7563c1edcc4e1039a62e6370ecb |
| Linux / Linux | affected 5.1; unaffected 0 before 5.1; unaffected 5.4.230 through 5.4.*; unaffected 5.10.165 through 5.10.*; unaffected 5.15.90 through 5.15.*; unaffected 6.1.8 through 6.1.*; unaffected 6.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/556dfdb226ce1e5231d8836159b23f8bb0395bf4
- https://git.kernel.org/stable/c/b171d0d2cf1b8387c72c8d325c5d5746fa271e39
- https://git.kernel.org/stable/c/61a0890cb95afec5c8a2f4a879de2b6220984ef1
- https://git.kernel.org/stable/c/079c78c68714f7d8d58e66c477b0243b31806907
- https://git.kernel.org/stable/c/96b328d119eca7563c1edcc4e1039a62e6370ecb
ADP enrichment
No English description supplied.
No references supplied.