CVE-2026-74647

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux2419e55e532de14fdf336e09e453aa2831c73a25 < 97273624f7b356eaf8261609a75cfcb8738a165aaffected
LinuxLinux2419e55e532de14fdf336e09e453aa2831c73a25 < fe70329055977fc1e8dc6291318d0dd75470795aaffected
LinuxLinux2419e55e532de14fdf336e09e453aa2831c73a25 < 9bf22a7d950cec2d1efeca7f16bb20fcca84c36aaffected
LinuxLinux2419e55e532de14fdf336e09e453aa2831c73a25 < 0beaa9bd7eb10d9b5e6352ed5161f3f3bbd4c3c5affected
LinuxLinux2419e55e532de14fdf336e09e453aa2831c73a25 < 6102ceb4eab845743ee57acd3863fbd06e93c927affected
LinuxLinux5.5affected
LinuxLinux0 < 5.5unaffected
LinuxLinux6.6.152 <= 6.6.*unaffected
LinuxLinux6.12.104 <= 6.12.*unaffected
LinuxLinux6.18.45 <= 6.18.*unaffected
LinuxLinux7.1.9 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References