---
id: CVE-2026-93137
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Fix use-after-free on mm_struct in bpf_find_vma()

  bpf_find_vma() reads task->mm and calls mmap_read_trylock(mm) without
  holding a reference on the mm
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Fix use-after-free on mm_struct in bpf_find_vma()

  bpf_find_vma() reads task->mm and calls mmap_read_trylock(mm) without
  holding a reference on the mm. On a foreig…
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'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 7c7e3d31e7856a8260a254f8c71db416f7f9f5a1 <
    db347840d6b6ee9bb9b8e4a985d4b4419f9f3200
  - >-
    Linux >= 7c7e3d31e7856a8260a254f8c71db416f7f9f5a1 <
    8e1101fc4118019a69c96ced4aec93164f89cbd5
  - >-
    Linux >= 7c7e3d31e7856a8260a254f8c71db416f7f9f5a1 <
    c7ad910e987008e125eeff448892e86852173384
  - >-
    Linux >= 7c7e3d31e7856a8260a254f8c71db416f7f9f5a1 <
    86d54cf069fc5ae2e111c87933bebf6eb527978e
  - >-
    Linux >= 7c7e3d31e7856a8260a254f8c71db416f7f9f5a1 <
    2b2a903bee56d312539046d9defa8023eec94760
  - >-
    Linux >= 7c7e3d31e7856a8260a254f8c71db416f7f9f5a1 <
    47b079e2117a2ee52e21f8b72935900c702fc0b5
  - Linux 5.17
published: '2026-09-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T18:18:22.207'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93137'
references:
  - url: 'https://git.kernel.org/stable/c/2b2a903bee56d312539046d9defa8023eec94760'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/47b079e2117a2ee52e21f8b72935900c702fc0b5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/86d54cf069fc5ae2e111c87933bebf6eb527978e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8e1101fc4118019a69c96ced4aec93164f89cbd5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c7ad910e987008e125eeff448892e86852173384'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/db347840d6b6ee9bb9b8e4a985d4b4419f9f3200'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00171
epssPercentile: 0.05659
ingestedAt: '2026-09-17T16:21:47.745Z'
---

## Overview

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

bpf: Fix use-after-free on mm_struct in bpf_find_vma()

bpf_find_vma() reads task->mm and calls mmap_read_trylock(mm) without
holding a reference on the mm. On a foreign task, a concurrent exit_mm()
can free the mm_struct between the lockless read and the trylock,
resulting in a use-after-free. mm_struct is not SLAB_TYPESAFE_BY_RCU.

For the current task, task->mm is stable. For a foreign task, pin the mm
under task->alloc_lock and release it with mmput_async(), mirroring commit
d8e27d2d22b6 ("bpf: fix mm lifecycle in open-coded task_vma iterator").
Use spin_trylock() instead of get_task_mm() so BPF context does not block
on alloc_lock. Reject irqs-disabled contexts and !CONFIG_MMU on the
foreign-task path because dropping the mm reference is not safe there.

Race:

  CPU0 (BPF program)                  CPU1 (exiting task)
  ============================        ==========================
  bpf_find_vma(foreign_task):
    mm = task->mm
                                      exit_mm():
                                        task->mm = NULL
                                        mmput(mm) -> frees mm_struct
    mmap_read_trylock(mm)
        // UAF on mm

## Remediation

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