---
id: CVE-2026-23118
title: 'rxrpc: Fix data-race warning and potential load/store tearing'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  rxrpc: Fix data-race warning and potential load/store tearing

  Fix the following:

          BUG: KCSAN: data-race in rxrpc_peer_keepalive_worker / rxrpc_send_data_packet…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= ace45bec6d77bc061c3c3d8ad99e298ea9800c2b <
    49b8ef1abfe7713e15d9128006cb76e413b12b57
  - >-
    Linux >= ace45bec6d77bc061c3c3d8ad99e298ea9800c2b <
    a426f29ac3fa3465093567ab763ada46762fb57c
  - >-
    Linux >= ace45bec6d77bc061c3c3d8ad99e298ea9800c2b <
    c08cf314191cd0f8699089715efb9eff030f0086
  - >-
    Linux >= ace45bec6d77bc061c3c3d8ad99e298ea9800c2b <
    f8cf1368e0a5491b27189a695c36f64e48f3d19d
  - >-
    Linux >= ace45bec6d77bc061c3c3d8ad99e298ea9800c2b <
    5d5fe8bcd331f1e34e0943ec7c18432edfcf0e8b
  - Linux 4.17
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T21:19:55.807640Z'
published: '2026-02-14'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T21:23:17.922Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-23118'
references:
  - url: 'https://git.kernel.org/stable/c/49b8ef1abfe7713e15d9128006cb76e413b12b57'
  - url: 'https://git.kernel.org/stable/c/a426f29ac3fa3465093567ab763ada46762fb57c'
  - url: 'https://git.kernel.org/stable/c/c08cf314191cd0f8699089715efb9eff030f0086'
  - url: 'https://git.kernel.org/stable/c/f8cf1368e0a5491b27189a695c36f64e48f3d19d'
  - url: 'https://git.kernel.org/stable/c/5d5fe8bcd331f1e34e0943ec7c18432edfcf0e8b'
tags:
  - cve.org
epss: 0.00098
epssPercentile: 0.00773
ingestedAt: '2026-11-05T15:02:32.186Z'
---

## Overview

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

rxrpc: Fix data-race warning and potential load/store tearing

Fix the following:

        BUG: KCSAN: data-race in rxrpc_peer_keepalive_worker / rxrpc_send_data_packet

which is reporting an issue with the reads and writes to ->last_tx_at in:

        conn->peer->last_tx_at = ktime_get_seconds();

and:

        keepalive_at = peer->last_tx_at + RXRPC_KEEPALIVE_TIME;

The lockless accesses to these to values aren't actually a problem as the
read only needs an approximate time of last transmission for the purposes
of deciding whether or not the transmission of a keepalive packet is
warranted yet.

Also, as ->last_tx_at is a 64-bit value, tearing can occur on a 32-bit
arch.

Fix both of these by switching to an unsigned int for ->last_tx_at and only
storing the LSW of the time64_t.  It can then be reconstructed at need
provided no more than 68 years has elapsed since the last transmission.

## Affected

- `Linux >= ace45bec6d77bc061c3c3d8ad99e298ea9800c2b < 49b8ef1abfe7713e15d9128006cb76e413b12b57`
- `Linux >= ace45bec6d77bc061c3c3d8ad99e298ea9800c2b < a426f29ac3fa3465093567ab763ada46762fb57c`
- `Linux >= ace45bec6d77bc061c3c3d8ad99e298ea9800c2b < c08cf314191cd0f8699089715efb9eff030f0086`
- `Linux >= ace45bec6d77bc061c3c3d8ad99e298ea9800c2b < f8cf1368e0a5491b27189a695c36f64e48f3d19d`
- `Linux >= ace45bec6d77bc061c3c3d8ad99e298ea9800c2b < 5d5fe8bcd331f1e34e0943ec7c18432edfcf0e8b`
- `Linux 4.17`

## Remediation

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