CVE-2022-49912

Local denial of service via qgroup ulist leak

Published May 1, 2025 · Updated May 11, 2026

Memory leakage in btrfs qgroup self tests allows local users to interrupt service by repeatedly triggering failing test paths. The test_no_shared_qgroup() and test_multiple_refs() error paths return after tree-reference or extent operations fail without freeing the old_roots ulist allocated by btrfs_find_all_roots(). Exposure requires a kernel built to run the btrfs in-kernel self tests and access sufficient to invoke them; sustained failures consume kernel memory without disclosing or modifying data.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leakage in btrfs qgroup self tests allows local users to interrupt service by repeatedly triggering failing test paths. The test_no_shared_qgroup() and test_multiple_refs() error paths return after tree-reference or extent operations fail without freeing the old_roots ulist allocated by btrfs_find_all_roots(). Exposure requires a kernel built to run the btrfs in-kernel self tests and access sufficient to invoke them; sustained failures consume kernel memory without disclosing or modifying data.

The record

CVE
CVE-2022-49912
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 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

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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=4.2
  2. Affected versionversion=442244c9633292a147ab2b29e7007a7c8a3909b2 <0a0dead4ad1a2e2a9bdf133ef45111d7c8daef84
  3. Affected versionversion=442244c9633292a147ab2b29e7007a7c8a3909b2 <203204798831c35d855ecc6417d98267d2d2184b
  4. Affected versionversion=442244c9633292a147ab2b29e7007a7c8a3909b2 <3f58283d83a588ff5da62fc150de19e798ed2ec2
  5. Affected versionversion=442244c9633292a147ab2b29e7007a7c8a3909b2 <5d1a47ebf84540e40b5b43fc21aef0d6c0f627d9
  6. Affected versionversion=442244c9633292a147ab2b29e7007a7c8a3909b2 <d37de92b38932d40e4a251e876cc388f9aee5f42
  7. Affected versionversion=442244c9633292a147ab2b29e7007a7c8a3909b2 <d81370396025cf63a7a1b5f8bb25a3479203b2ca
  8. Affected versionversion=442244c9633292a147ab2b29e7007a7c8a3909b2 <da7003434bcab0ae9aba3f2c003e734cae093326
  9. Affected versionversion=442244c9633292a147ab2b29e7007a7c8a3909b2 <f46ea5fa3320dca4fe0c0926b49a5f14cb85de62

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.2; version=442244c9633292a147ab2b29e7007a7c8a3909b2 <0a0dead4ad1a2e2a9bdf133ef45111d7c8daef84; version=442244c9633292a147ab2b29e7007a7c8a3909b2 <203204798831c35d855ecc6417d98267d2d2184b; version=442244c9633292a147ab2b29e7007a7c8a3909b2 <3f58283d83a588ff5da62fc150de19e798ed2ec2; version=442244c9633292a147ab2b29e7007a7c8a3909b2 <5d1a47ebf84540e40b5b43fc21aef0d6c0f627d9; version=442244c9633292a147ab2b29e7007a7c8a3909b2 <d37de92b38932d40e4a251e876cc388f9aee5f42; version=442244c9633292a147ab2b29e7007a7c8a3909b2 <d81370396025cf63a7a1b5f8bb25a3479203b2ca; version=442244c9633292a147ab2b29e7007a7c8a3909b2 <da7003434bcab0ae9aba3f2c003e734cae093326; version=442244c9633292a147ab2b29e7007a7c8a3909b2 <f46ea5fa3320dca4fe0c0926b49a5f14cb85de62

Published CVSS scores

5.5Amazon LinuxCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499.004Application or System Exploitation

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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