---
id: CVE-2026-63800
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  pNFS: Fix use-after-free in pnfs_update_layout()

  When hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(),
  the code calls pnfs_prepare_to_retry_layoutget(lo).…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  pNFS: Fix use-after-free in pnfs_update_layout()

  When hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(),
  the code calls pnfs_prepare_to_retry_layoutget(lo).…
severity: none
published: '2026-07-19'
updated: '2026-07-19'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63800'
references:
  - url: 'https://git.kernel.org/stable/c/13e198a90ca4050f4bee8a3f23680389a6563ccc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/1f24b8302c77dcaf79c64c073877a3b9f4dd25d2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/200e7637f4d6a1342987045eea72641524f909dc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2883ddd7542b4437a2ab4908fe2773f690e20889'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7e37e9b3e82ade881e1798e2f4fcc54aff7793c1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9645aaf689aff57427ece3b9fa47d5b5399417f4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9c0fb5c09ae5bd68dc0038692af8127029cb0385'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
ingestedAt: '2026-07-20T00:35:12.318Z'
epss: 0.00527
epssPercentile: 0.42249
---

## Overview

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

pNFS: Fix use-after-free in pnfs_update_layout()

When hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(),
the code calls pnfs_prepare_to_retry_layoutget(lo). If it succeeds,
pnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(),
which still references 'lo'. This results in a use-after-free when the
tracepoint accesses lo's fields.

Fix this by moving the tracepoint call before pnfs_put_layout_hdr(lo).

## Remediation

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