CVE-2022-49425

Local kernel memory corruption via stale f2fs iterator

Published Feb 26, 2025 · Updated Aug 5, 2026

Memory corruption in the f2fs subsystem in Linux allows local users to gain kernel read and write primitives through atomic-write ioctls. The f2fs_drop_inmem_page path leaves cur as a bogus pointer when no list entry matches, then reads cur->page and can pass the stale object to list_del and kmem_cache_free. A low-privileged user must own a file on a mounted f2fs volume and drive an atomic-write, write, and truncate sequence, which can corrupt kernel heap state or panic the host.

CVSS severity7.8
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in the f2fs subsystem in Linux allows local users to gain kernel read and write primitives through atomic-write ioctls. The f2fs_drop_inmem_page path leaves cur as a bogus pointer when no list entry matches, then reads cur->page and can pass the stale object to list_del and kmem_cache_free. A low-privileged user must own a file on a mounted f2fs volume and drive an atomic-write, write, and truncate sequence, which can corrupt kernel heap state or panic the host.

The record

CVE
CVE-2022-49425
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.12
  2. Affected versionversion=8c242db9b8c01b252290e23827163787f07e01d1 <2aaf51dd39afb6d01d13f1e6fe20b684733b37d5
  3. Affected versionversion=8c242db9b8c01b252290e23827163787f07e01d1 <385edd3ce5b4b1e9d31f474a5e35a39779ec1110
  4. Affected versionversion=8c242db9b8c01b252290e23827163787f07e01d1 <45b2b7d7108ae1e25a5036cab04ab9273e792332
  5. Affected versionversion=8c242db9b8c01b252290e23827163787f07e01d1 <51d584704d18e60fa473823654f35611c777b291
  6. Affected versionversion=8c242db9b8c01b252290e23827163787f07e01d1 <5e47a7add3dda7f236548c5ec3017776dc2a729f
  7. Affected versionversion=8c242db9b8c01b252290e23827163787f07e01d1 <b26e1c777890e4b938136deb8ec07a29f33862e4
  8. Affected versionversion=8c242db9b8c01b252290e23827163787f07e01d1 <ed7efc472c00986dcd6903ab6ed165c7fa167674

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.12; version=8c242db9b8c01b252290e23827163787f07e01d1 <2aaf51dd39afb6d01d13f1e6fe20b684733b37d5; version=8c242db9b8c01b252290e23827163787f07e01d1 <385edd3ce5b4b1e9d31f474a5e35a39779ec1110; version=8c242db9b8c01b252290e23827163787f07e01d1 <45b2b7d7108ae1e25a5036cab04ab9273e792332; version=8c242db9b8c01b252290e23827163787f07e01d1 <51d584704d18e60fa473823654f35611c777b291; version=8c242db9b8c01b252290e23827163787f07e01d1 <5e47a7add3dda7f236548c5ec3017776dc2a729f; version=8c242db9b8c01b252290e23827163787f07e01d1 <b26e1c777890e4b938136deb8ec07a29f33862e4; version=8c242db9b8c01b252290e23827163787f07e01d1 <ed7efc472c00986dcd6903ab6ed165c7fa167674

Published CVSS scores

7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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