CVE-2022-49168

Kernel memory corruption via repair bio double cleanup

Published Feb 26, 2025 · Updated Aug 5, 2026

Use-after-free in Linux btrfs 3.18 through 5.17.1 allows local users to corrupt kernel memory via reads on multi-copy volumes. After a repair-bio submission failure, the submit helper invokes bio_endio, but the repair path also frees the bio and failure record while endio cleanup is running. An already-mounted RAID1, DUP, or RAID10 btrfs volume and a failed data-bio submission are required; successful exploitation permits kernel-memory access, control-flow hijacking, or a kernel panic.

CVSS severity7.8
High
EPSS probability0.30%
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 btrfs 3.18 through 5.17.1 allows local users to corrupt kernel memory via reads on multi-copy volumes. After a repair-bio submission failure, the submit helper invokes bio_endio, but the repair path also frees the bio and failure record while endio cleanup is running. An already-mounted RAID1, DUP, or RAID10 btrfs volume and a failed data-bio submission are required; successful exploitation permits kernel-memory access, control-flow hijacking, or a kernel panic.

The record

CVE
CVE-2022-49168
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, 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=3.18
  2. Affected versionversion=6c387ab20db15f2bd448f7c508e2638101b16ea1 <7170875083254b51fcc5d67f96640977083f481e
  3. Affected versionversion=6c387ab20db15f2bd448f7c508e2638101b16ea1 <8cbc3001a3264d998d6b6db3e23f935c158abd4d
  4. Affected versionversion=6c387ab20db15f2bd448f7c508e2638101b16ea1 <d1cb11fb45ebbb1e7dfe5e9038b32ea72c184b14
  5. Affected versionversion=6c387ab20db15f2bd448f7c508e2638101b16ea1 <e76c78c48902dae6fa612749f59162bca0a79e0b
  6. Affected versionversion=6c387ab20db15f2bd448f7c508e2638101b16ea1 <e7e1d15d2bd8c373cf621614ddd17971a2132713

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.18; version=6c387ab20db15f2bd448f7c508e2638101b16ea1 <7170875083254b51fcc5d67f96640977083f481e; version=6c387ab20db15f2bd448f7c508e2638101b16ea1 <8cbc3001a3264d998d6b6db3e23f935c158abd4d; version=6c387ab20db15f2bd448f7c508e2638101b16ea1 <d1cb11fb45ebbb1e7dfe5e9038b32ea72c184b14; version=6c387ab20db15f2bd448f7c508e2638101b16ea1 <e76c78c48902dae6fa612749f59162bca0a79e0b; version=6c387ab20db15f2bd448f7c508e2638101b16ea1 <e7e1d15d2bd8c373cf621614ddd17971a2132713

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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