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.
Affected versions
Linux kernel versions
5.5
and later are affected. Fixed in
6.6.152,
6.12.104,
6.18.45,
7.1.9,
7.2
and their respective stable series.
References
5 totalFrequently asked questions
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What is CVE-2026-74647?
CVE-2026-74647 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.5 onward and has been patched in 6.6.152, 6.12.104, 6.18.45 and others. CVE-2026-74647 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-74647?
Yes. CVE-2026-74647 has been patched. Fixed versions include 6.6.152, 6.12.104, 6.18.45 and others. If you are running Linux kernel 5.5 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-74647 actively exploited?
No. CVE-2026-74647 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.