CVE-2022-50009

Kernel crash via COW inode null dereference

Published Jun 18, 2025 · Updated Aug 15, 2026

Null-pointer dereference in the F2FS atomic-write path in Linux 5.19 allows local users to crash the kernel through an atomic file write. The COW inode is incorrectly marked FI_ATOMIC_FILE, so f2fs_do_write_data_page follows its null cow_inode pointer during writeback. Reachability requires local write access to an F2FS file using atomic-write semantics; the demonstrated consequence is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null-pointer dereference in the F2FS atomic-write path in Linux 5.19 allows local users to crash the kernel through an atomic file write. The COW inode is incorrectly marked FI_ATOMIC_FILE, so f2fs_do_write_data_page follows its null cow_inode pointer during writeback. Reachability requires local write access to an F2FS file using atomic-write semantics; the demonstrated consequence is a kernel crash.

The record

CVE
CVE-2022-50009
Published
Jun 18, 2025
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3db1de0e582c358dd013f3703cd55b5fe4076436 <4a2c5b7994960fac29cf8a3f4e62855bae1b27d4
  2. Affected versionversion=3db1de0e582c358dd013f3703cd55b5fe4076436 <7000ad53ec1b17bd2fac76984b7b0c663755cbb7
  3. Affected versionversion=5.19
  4. Affected versionversion=6db52f1944417c2601182a591a704e2f119c5215 <0f63e33eca6fa29a11c76fa31db5fe1cada5ad6e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3db1de0e582c358dd013f3703cd55b5fe4076436 <4a2c5b7994960fac29cf8a3f4e62855bae1b27d4; version=3db1de0e582c358dd013f3703cd55b5fe4076436 <7000ad53ec1b17bd2fac76984b7b0c663755cbb7; version=5.19; version=6db52f1944417c2601182a591a704e2f119c5215 <0f63e33eca6fa29a11c76fa31db5fe1cada5ad6e

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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