What’s Vulnerable › Vulnerabilities

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

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-30 · updated 2026-06-17

Description

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.

Affected products

• Linux kernel: 5.10 — fixed in 6.1

How to fix

Upgrade to a fixed version: Linux kernel 6.1. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/68ed9c76b2affd47177b92495446abb7262d0ef7
• https://git.kernel.org/stable/c/7a33dde572fceb45d02d188e0213c47059401c93
• https://git.kernel.org/stable/c/9b073d73725366d886b711b74e058c02f51e7a0e
• https://git.kernel.org/stable/c/e0d5fc7a6d80ac2406c7dfc6bb625201d0250a8a
• https://git.kernel.org/stable/c/e7385c868ee038d6a0cb0e85c22d2741e7910fd5

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