CVE-2022-49761

Disputed diagnostic-only error-reporting change

Published Mar 27, 2025 · Updated May 11, 2026

A disputed use-after-free claim in Linux 3.4 through 6.1 concerns btrfs delayed-reference error reporting during transaction aborts. The patch moves logging into run_one_delayed_ref(), promotes btrfs_debug() to btrfs_err(), and reports fields before the caller can free the node. The btrfs maintainer states that the change has no functional security effect, while Ubuntu says the internal error is not attacker-influenceable and the prior code does not read freed fields.

CVSS severity7.8
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

A disputed use-after-free claim in Linux 3.4 through 6.1 concerns btrfs delayed-reference error reporting during transaction aborts. The patch moves logging into run_one_delayed_ref(), promotes btrfs_debug() to btrfs_err(), and reports fields before the caller can free the node. The btrfs maintainer states that the change has no functional security effect, while Ubuntu says the internal error is not attacker-influenceable and the prior code does not read freed fields.

The record

CVE
CVE-2022-49761
Published
Mar 27, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 27, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=3.4
  2. Affected versionversion=79787eaab46121d4713ed03c8fc63b9ec3eaec76 <18bd1c9c02e64a3567f90c83c2c8b855531c8098
  3. Affected versionversion=79787eaab46121d4713ed03c8fc63b9ec3eaec76 <39f501d68ec1ed5cd5c66ac6ec2a7131c517bb92
  4. Affected versionversion=79787eaab46121d4713ed03c8fc63b9ec3eaec76 <853ffa1511b058c79a4c9bb1407b3b20ce311792
  5. Affected versionversion=79787eaab46121d4713ed03c8fc63b9ec3eaec76 <fdb4a70bb768d2a87890409597529ad81cb3de8a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.4; version=79787eaab46121d4713ed03c8fc63b9ec3eaec76 <18bd1c9c02e64a3567f90c83c2c8b855531c8098; version=79787eaab46121d4713ed03c8fc63b9ec3eaec76 <39f501d68ec1ed5cd5c66ac6ec2a7131c517bb92; version=79787eaab46121d4713ed03c8fc63b9ec3eaec76 <853ffa1511b058c79a4c9bb1407b3b20ce311792; version=79787eaab46121d4713ed03c8fc63b9ec3eaec76 <fdb4a70bb768d2a87890409597529ad81cb3de8a

Published CVSS scores

7.8UbuntuCVSS: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

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo