Security readout for executives and security teams
Plain-English summary
This Linux kernel flaw can crash or destabilize systems when Btrfs scrub processes certain ext4-converted Btrfs filesystems with chunk lengths not aligned to 64K. The public record describes use-after-free behavior and unrecoverable scrub errors, but provides no CVSS score or evidence of active exploitation.
Executive priority
Handle in normal kernel patch cycles, with priority for systems where Btrfs scrub protects important data. Escalate if affected hosts show scrub errors or storage-related crashes, because the issue can undermine confidence in filesystem maintenance and availability.
Technical view
Btrfs scrub could read past the real chunk range when a chunk ended before the expected 64K stripe boundary. The resulting bio split caused scrub endio handling to run twice; the first completion freed bio-related memory, and the second could reuse freed data. The fix limits bit updates and submitted reads to the actual chunk range.
Likely exposure
Exposure appears limited to Linux systems running affected kernel builds with Btrfs, especially ext4-converted Btrfs filesystems with non-64K-aligned chunk lengths, when scrub is run. The source lists Linux versions and stable commits, but distribution-specific affected package ranges are not provided.
Exploitation context
The provided sources describe a bug report, KASAN use-after-free, scrub errors, and crashes. They do not claim remote exploitation, privilege escalation, public exploit availability, or KEV listing. Treat this as a reliability and potential local availability risk unless vendor guidance states otherwise.
Researcher notes
The evidence is a kernel fix record rather than a complete advisory. It ties the failure to Btrfs scrub, bio splitting at chunk boundaries, and ext4-converted layouts. No CWE, CVSS, exploit status, or distro package mapping is included in the provided bundle.
Mitigation direction
- Update to a kernel containing the referenced stable Btrfs fixes.
- Check Linux distribution advisories for exact fixed package versions.
- Prioritize hosts using Btrfs scrub on ext4-converted Btrfs filesystems.
- Avoid relying on scrub results from affected kernels for integrity assurance.
- Plan maintenance windows for storage hosts before kernel rollout if required.
Validation and detection
- Inventory Linux kernel versions on systems using Btrfs.
- Identify ext4-converted Btrfs filesystems where that metadata is tracked.
- Review logs for scrub errors about missing chunk maps.
- Review crash reports for KASAN slab-use-after-free in Btrfs scrub paths.
- Confirm installed kernels include the referenced stable commits or vendor backports.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2024-26616 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
SSVC decision data
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/642b9c520ef2f104277ad1f902f8526edbe087fbCVE reference, Linux
- https://git.kernel.org/stable/c/34de0f04684ec00c093a0455648be055f0e8e24fCVE reference, Linux
- https://git.kernel.org/stable/c/f546c4282673497a06ecb6190b50ae7f6c85b02fCVE reference, Linux
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.