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CVE Record

CVE-2022-49912: btrfs: fix ulist leaks in error paths of qgroup self tests

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix ulist leaks in error paths of qgroup self tests In the test_no_shared_qgroup() and test_multiple_refs() qgroup self tests, if we fail to add the tree ref, remove the extent item or remove the extent ref, we are returning from the test function without freeing the "old_roots" ulist that was allocated by the previous calls to btrfs_find_all_roots(). Fix that by calling ulist_free() before returning.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel Btrfs memory leak fix in quota group self-test error paths. The supplied sources do not show active exploitation, CVSS scoring, or a user-facing attack path. Business urgency is mainly routine kernel hygiene unless your fleet depends on affected Linux kernels and Btrfs quota testing paths.

Executive priority

Handle through standard kernel patch management. Escalate only if affected Btrfs-heavy systems are business critical or vendor guidance later reports broader impact or exploitation.

Technical view

Btrfs qgroup self tests test_no_shared_qgroup() and test_multiple_refs() could return after certain failures without freeing the old_roots ulist allocated by btrfs_find_all_roots(). Stable kernel commits add ulist_free() on those error paths. The source identifies affected Linux versions but gives no CWE, CVSS, or exploit primitive.

Likely exposure

Exposure appears limited to Linux systems running affected kernel versions with the relevant Btrfs quota group self-test code. The source does not establish impact on normal Btrfs filesystem operation, remote access, privilege escalation, or data compromise.

Exploitation context

The bundle marks KEV as false and provides no cited evidence of active exploitation, public weaponization, or exploit availability. Based only on supplied sources, this should not be treated as exploited in the wild.

Researcher notes

The record is sparse: no CVSS, CWE, exploit status, or detailed impact analysis is supplied. The described bug is a resource leak in Btrfs qgroup self-test error handling, fixed by freeing old_roots before returns.

Mitigation direction

  • Check your Linux distribution kernel advisory for CVE-2022-49912 backport status.
  • Upgrade to a kernel build containing the referenced stable Btrfs fix.
  • Prioritize hosts using Btrfs or kernel self-test workflows first.
  • Track vendor guidance because the bundle names no standalone workaround.

Validation and detection

  • Inventory Linux kernel versions across servers, images, and appliances.
  • Identify systems using Btrfs or running Btrfs qgroup self tests.
  • Compare installed kernels against vendor advisories and stable commit backports.
  • Confirm patched kernels include the ulist_free() error-path fix.
Prepared
Confidence
medium
Sources
10

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2022-49912 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
0ADP providers
9Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux442244c9633292a147ab2b29e7007a7c8a3909b2, 442244c9633292a147ab2b29e7007a7c8a3909b2, 442244c9633292a147ab2b29e7007a7c8a3909b2, 442244c9633292a147ab2b29e7007a7c8a3909b2, 442244c9633292a147ab2b29e7007a7c8a3909b2, 442244c9633292a147ab2b29e7007a7c8a3909b2, 442244c9633292a147ab2b29e7007a7c8a3909b2, 442244c9633292a147ab2b29e7007a7c8a3909b2unaffected
LinuxLinux4.2, 0, 4.9.333, 4.14.299, 4.19.265, 5.4.224, 5.10.154, 5.15.78, 6.0.8, 6.1affected
Weakness

CWE details

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