CVE-2022-49456

Kernel crash via bonding use-after-free race

Published Feb 26, 2025 · Updated Aug 5, 2026

Use-after-free in Linux 5.17 through 5.18.2 allows local users to crash the kernel through bonding timestamp configuration. bond_ethtool_get_ts_info reads the active slave without RCU protection while concurrent bond release can free that object before real_dev is used. Reaching the race requires local low-privileged access, a bonding device, and concurrent socket and bond reconfiguration; successful triggering can panic the kernel.

CVSS severity5.5
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux 5.17 through 5.18.2 allows local users to crash the kernel through bonding timestamp configuration. bond_ethtool_get_ts_info reads the active slave without RCU protection while concurrent bond release can free that object before real_dev is used. Reaching the race requires local low-privileged access, a bonding device, and concurrent socket and bond reconfiguration; successful triggering can panic the kernel.

The record

CVE
CVE-2022-49456
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.17
  2. Affected versionversion=aa6034678e873db8bd5c5a4b73f8b88c469374d6 <1b66a533c47d29b38af8e05fbb53b609a5ba3a4e
  3. Affected versionversion=aa6034678e873db8bd5c5a4b73f8b88c469374d6 <85eed460681da71b359ed906bce4d800081db854
  4. Affected versionversion=aa6034678e873db8bd5c5a4b73f8b88c469374d6 <9b80ccda233fa6c59de411bf889cc4d0e028f2c7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.17; version=aa6034678e873db8bd5c5a4b73f8b88c469374d6 <1b66a533c47d29b38af8e05fbb53b609a5ba3a4e; version=aa6034678e873db8bd5c5a4b73f8b88c469374d6 <85eed460681da71b359ed906bce4d800081db854; version=aa6034678e873db8bd5c5a4b73f8b88c469374d6 <9b80ccda233fa6c59de411bf889cc4d0e028f2c7

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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