Description
In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: Remove buffer from list prior to unmap operation fastrpc_req_munmap_impl() is called to unmap any buffer. The buffer is getting removed from the list after it is unmapped from DSP. This can create potential race conditions if multiple threads invoke unmap concurrently, where one thread may remove the entry from the list while another thread's unmap operation is still ongoing. Fix this by removing the buffer entry from the list before calling the unmap operation. If the unmap fails, the entry is re-added to the list so that userspace can retry the unmap, or alternatively, the buffer will be cleaned up during device release when the DSP process is torn down and all DSP-side mappings are freed along with remaining buffers in the list.
References8
- git.kernel.org/stable/c/0beaa9bd7eb10d9b5e6352ed5161f3f3bbd4c3c5
- git.kernel.org/stable/c/1edb654b2b41baee2ab5cf418baaf6e57dfbd802
- git.kernel.org/stable/c/4716c23c206a2f99ca54ebfdd8b5ba9dd0102240
- git.kernel.org/stable/c/6102ceb4eab845743ee57acd3863fbd06e93c927
- git.kernel.org/stable/c/97273624f7b356eaf8261609a75cfcb8738a165a
- git.kernel.org/stable/c/99f8de36c84cb9b872157aa6c3578c2480cee4b8
- git.kernel.org/stable/c/9bf22a7d950cec2d1efeca7f16bb20fcca84c36a
- git.kernel.org/stable/c/fe70329055977fc1e8dc6291318d0dd75470795a
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 3 · as of 9 November 2026
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.