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CVE Record

CVE-2022-50839: jbd2: fix potential buffer head reference count leak

In the Linux kernel, the following vulnerability has been resolved: jbd2: fix potential buffer head reference count leak As in 'jbd2_fc_wait_bufs' if buffer isn't uptodate, will return -EIO without update 'journal->j_fc_off'. But 'jbd2_fc_release_bufs' will release buffer head from ‘j_fc_off - 1’ if 'bh' is NULL will terminal release which will lead to buffer head buffer head reference count leak. To solve above issue, update 'journal->j_fc_off' before return -EIO.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2022-50839 is a Linux kernel jbd2 journaling bug where an error path can leak buffer-head references. The public record does not provide a CVSS score or confirmed business impact. Treat it as a kernel reliability issue that should be addressed through normal Linux kernel maintenance, especially on systems using ext4/jbd2 journaling.

Executive priority

Schedule remediation through the next kernel patch cycle unless the system is highly availability-sensitive. Escalate priority for critical Linux hosts using ext4 where kernel updates are already overdue. Current public evidence does not support emergency treatment based on exploitation.

Technical view

The flaw is in jbd2 fast commit handling. If jbd2_fc_wait_bufs returns -EIO for a non-uptodate buffer, journal->j_fc_off was not updated, and later jbd2_fc_release_bufs could miss releasing references, causing a buffer-head reference count leak. Kernel stable commits update j_fc_off before returning the error.

Likely exposure

Exposure is limited to Linux systems running affected kernel builds with jbd2 in use, commonly through ext4 journaling. The source bundle indicates Linux kernel stable branches around 5.10, 5.15, 5.19, 6.0, and 6.1, but exact vendor package ranges should be verified with distribution advisories.

Exploitation context

No active exploitation is indicated in the provided sources, and the CVE is not marked KEV. The public description describes an error-path reference leak, not a remote code execution path. Practical impact is likely availability or resource exhaustion risk, but the sources do not quantify exploitability.

Researcher notes

The available record is sparse: no CVSS, CWE, exploit report, or detailed affected package matrix is provided. Analysis should focus on mapping the stable commits to downstream distribution kernels and confirming whether jbd2 fast commit code is present and reachable in deployed configurations.

Mitigation direction

  • Update affected Linux kernels using vendor or distribution security guidance.
  • Prioritize systems relying on ext4 or jbd2-backed filesystems.
  • If self-maintaining kernels, review and apply the referenced stable commits.
  • Monitor vendor advisories for exact fixed package versions.

Validation and detection

  • Inventory running Linux kernel versions across servers and appliances.
  • Check whether ext4 or jbd2 journaling is used on critical systems.
  • Compare installed kernels with vendor-fixed versions or referenced stable commits.
  • Confirm patched systems have rebooted into the updated kernel.
Prepared
Confidence
medium
Sources
7

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

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

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CVE-2022-50839 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
0Timeline events
0ADP providers
6Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxff780b91efe901b8eecd8114785abae5341820ad, ff780b91efe901b8eecd8114785abae5341820ad, ff780b91efe901b8eecd8114785abae5341820ad, ff780b91efe901b8eecd8114785abae5341820ad, ff780b91efe901b8eecd8114785abae5341820adunaffected
LinuxLinux5.10, 0, 5.10.150, 5.15.75, 5.19.17, 6.0.3, 6.1affected
Weakness

CWE details

No CWE listed

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