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.
CSIRTS triage
- What
- Buffer removal from tracking list is not performed prior to unmap operation in the fastrpc driver, causing use-after-free.
- Who is affected
- Systems running vulnerable Linux kernel versions with fastrpc miscellaneous driver enabled.
- Urgency
- Medium priority; not currently exploited but use-after-free enables memory corruption and potential privilege escalation.
- Action
- Apply kernel patch reordering buffer removal before unmap in drivers/misc/fastrpc.c or update to patched kernel version.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch CVE-2026-74647
Get an email if CVE-2026-74647 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.
Exploitation outlook
- Low exploitation risk0.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.
Advisory coverage (2)
External references
Embed the live status
— this badge updates automatically when the KEV or exploit status changes. How to embed it →
[](https://www.csirts.com/cve/CVE-2026-74647)