---
id: CVE-2026-90235
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE

  xprtsock replaces and restores sk->sk_data_ready and
  sk->sk_write_space on live sockets wi…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE

  xprtsock replaces and restores sk->sk_data_ready and
  sk->sk_write_space on live sockets wi…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= a246b0105bbd9a70a698f69baae2042996f2a0e9 <
    ed80d009b154aa204f541d390884851b3d4f15ae
  - >-
    Linux >= a246b0105bbd9a70a698f69baae2042996f2a0e9 <
    589f761236e05ff9de1bdfd6a5258f113e6457fe
  - >-
    Linux >= a246b0105bbd9a70a698f69baae2042996f2a0e9 <
    da652cb17f9faeea1fa44b7215e8869a0b10b664
  - >-
    Linux >= a246b0105bbd9a70a698f69baae2042996f2a0e9 <
    d8f0b83753809761a560c4b33249388548ba6e43
  - >-
    Linux >= a246b0105bbd9a70a698f69baae2042996f2a0e9 <
    33930840b5f0a79f826e7c69dc6cd78f72a67481
  - Linux 2.6.15
published: '2026-09-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T18:17:48.413'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90235'
references:
  - url: 'https://git.kernel.org/stable/c/33930840b5f0a79f826e7c69dc6cd78f72a67481'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/589f761236e05ff9de1bdfd6a5258f113e6457fe'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d8f0b83753809761a560c4b33249388548ba6e43'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/da652cb17f9faeea1fa44b7215e8869a0b10b664'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ed80d009b154aa204f541d390884851b3d4f15ae'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00671
epssPercentile: 0.49941
ingestedAt: '2026-09-17T16:21:47.850Z'
---

## Overview

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

sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE

xprtsock replaces and restores sk->sk_data_ready and
sk->sk_write_space on live sockets with plain stores, and
xs_udp_do_set_buffer_size() invokes sk->sk_write_space via a plain
load. These callback pointers are shared with generic socket and
protocol paths that may read or invoke them concurrently, so xprtsock
needs the same READ_ONCE()/WRITE_ONCE() callback visibility contract
that the validated 4022 family applied elsewhere.

When SUNRPC takes over an AF_LOCAL, UDP, or TCP socket and later
restores the lower-socket callbacks during teardown, another CPU may
still hold an earlier callback snapshot. The plain replace/restore
pattern leaves the same visibility hole as the validated 4022 family,
so a stale snapshot can still invoke xs_data_ready() or
xs_udp_write_space() after the live callback fields have already been
restored to the lower-socket handlers.

Use WRITE_ONCE() for the shared sk_data_ready and sk_write_space
stores in xs_local_finish_connecting(), xs_udp_finish_connecting(),
xs_tcp_finish_connecting(), and xs_restore_old_callbacks(). Use
READ_ONCE() for the direct sk_write_space invocation in
xs_udp_do_set_buffer_size(). This matches the required callback
visibility contract while leaving adjacent sk_state_change and
sk_error_report handling unchanged.

## Remediation

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