CVE-2026-74647: Linux Vulnerability

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= 2419e55e532de14fdf336e09e453aa2831c73a25, < 97273624f7b356eaf8261609a75cfcb8738a165a; >= 2419e55e532de14fdf336e09e453aa2831c73a25, < fe70329055977fc1e8dc6291318d0dd75470795a; >= 2419e55e532de14fdf336e09e453aa2831c73a25, < 9bf22a7d950cec2d1efeca7f16bb20fcca84c36a; >= 2419e55e532de14fdf336e09e453aa2831c73a25, < 0beaa9bd7eb10d9b5e6352ed5161f3f3bbd4c3c5; >= 2419e55e532de14fdf336e09e453aa2831c73a25, < 6102ceb4eab845743ee57acd3863fbd06e93c927
Linux	Linux	5.5

References

Timeline

Published: Aug 22, 2026
Last Modified: Aug 22, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-74647?

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.

How severe is CVE-2026-74647?

Severity scoring for CVE-2026-74647 is pending analysis.

How do I fix CVE-2026-74647?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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