CVE-2022-50346

Kernel availability loss via uninitialized inode quota

Published Sep 16, 2025 · Updated Sep 16, 2025

Use of an uninitialized resource in Linux ext4 before 6.2 allows local users to trigger a kernel warning through a file rename. In ext4_rename, the old inode is marked dirty before its quota state is initialized, so extra_isize expansion can allocate a block against uninitialized quota state. A local user must be able to rename a file on an ext4 filesystem; the resulting filesystem warning can impair kernel availability.

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

What happened

Use of an uninitialized resource in Linux ext4 before 6.2 allows local users to trigger a kernel warning through a file rename. In ext4_rename, the old inode is marked dirty before its quota state is initialized, so extra_isize expansion can allocate a block against uninitialized quota state. A local user must be able to rename a file on an ext4 filesystem; the resulting filesystem warning can impair kernel availability.

The record

CVE
CVE-2022-50346
Published
Sep 16, 2025
Updated
Sep 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-908, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2025Record 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <13271fbbe85d73a7c47058f56a52f2a7f00d6e39
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <135ba9146f4d38abed48a540ef8a8770ff0bd34f
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <33fd7031d634f3b46e59f61adfbb0ea9fe514fef
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <67f6d5a4043f3db0c6bb0e14a0d97a7be8bfb8b5
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7dfb8259f66faafa68d23a261b284d2c2c67649b
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <84a2f2ed49d6a4d92b354219077434c57d334620
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <def7a39091e60e1c4a2f623629082a00092602be
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f263e349bacc2f303526dcfa61c4bc50132418b1
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fae381a3d79bb94aa2eb752170d47458d778b797

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <13271fbbe85d73a7c47058f56a52f2a7f00d6e39; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <135ba9146f4d38abed48a540ef8a8770ff0bd34f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <33fd7031d634f3b46e59f61adfbb0ea9fe514fef; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <67f6d5a4043f3db0c6bb0e14a0d97a7be8bfb8b5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7dfb8259f66faafa68d23a261b284d2c2c67649b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <84a2f2ed49d6a4d92b354219077434c57d334620; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <def7a39091e60e1c4a2f623629082a00092602be; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f263e349bacc2f303526dcfa61c4bc50132418b1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fae381a3d79bb94aa2eb752170d47458d778b797

Published CVSS scores

5.5CISACVSS: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource
T1499Endpoint Denial of Service

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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