---
id: CVE-2026-74647
title: |-
  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
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 af…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
published: '2026-08-22'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T13:10:00.187'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-74647'
references:
  - url: 'https://git.kernel.org/stable/c/0beaa9bd7eb10d9b5e6352ed5161f3f3bbd4c3c5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/1edb654b2b41baee2ab5cf418baaf6e57dfbd802'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4716c23c206a2f99ca54ebfdd8b5ba9dd0102240'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6102ceb4eab845743ee57acd3863fbd06e93c927'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/97273624f7b356eaf8261609a75cfcb8738a165a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/99f8de36c84cb9b872157aa6c3578c2480cee4b8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9bf22a7d950cec2d1efeca7f16bb20fcca84c36a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/fe70329055977fc1e8dc6291318d0dd75470795a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00176
epssPercentile: 0.06613
ingestedAt: '2026-10-14T13:30:58.526Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.