---
id: CVE-2026-74646
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke

  When an invoke is interrupted by a signal,
  wait_for_completion_interruptible() returns -ERESTARTSY…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke

  When an invoke is interrupted by a signal,
  wait_for_completion_interruptible() returns -ERESTARTSY…
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-2026-74646'
references:
  - url: 'https://git.kernel.org/stable/c/3f265e405e5ef85030c3777262e18bb556bc8724'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a902fe1f80f58a2335b6be1131866f827ec44d1a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/af6345159abcbaa550518f31990d2a9558c2d369'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b85a0e91d7d6cd06a53c881a46f749cfcef416a2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/efd02f8d1a7449f15809bc18d3cd41aafea75d7e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00175
epssPercentile: 0.0651
ingestedAt: '2026-10-14T13:30:58.525Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke

When an invoke is interrupted by a signal,
wait_for_completion_interruptible() returns -ERESTARTSYS and
fastrpc_internal_invoke() moves every buffer from fl->mmaps onto
cctx->invoke_interrupted_mmaps. This list_del()/list_add_tail() walk
runs without holding fl->lock, the lock that serialises fl->mmaps in
fastrpc_req_mmap() and fastrpc_req_munmap() everywhere else.

Take fl->lock around the move, matching every other fl->mmaps accessor.

## Remediation

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