CVE-2022-50379

Kernel crash via dangling Btrfs quota pointer

Published Sep 18, 2025 · Updated Sep 18, 2025

Use-after-free in the Btrfs quota code in affected Linux kernels allows local users to crash the kernel through concurrent quota ioctls. During btrfs_quota_enable(), an in-progress qgroup rescan makes qgroup_rescan_init() return -EINPROGRESS; the error path frees the quota root but leaves fs_info->quota_root pointing to the freed object. Reachability requires a Btrfs filesystem and local access able to race quota enablement against a quota-rescan ioctl, with the resulting dangling pointer threatening kernel availability.

CVSS severity4.7
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Btrfs quota code in affected Linux kernels allows local users to crash the kernel through concurrent quota ioctls. During btrfs_quota_enable(), an in-progress qgroup rescan makes qgroup_rescan_init() return -EINPROGRESS; the error path frees the quota root but leaves fs_info->quota_root pointing to the freed object. Reachability requires a Btrfs filesystem and local access able to race quota enablement against a quota-rescan ioctl, with the resulting dangling pointer threatening kernel availability.

The record

CVE
CVE-2022-50379
Published
Sep 18, 2025
Updated
Sep 18, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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 <0efd9dfc00d677a1d0929319a6103cb2dfc41c22
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <26b7c0ac49a3eea15559c9d84863736a6d1164b4
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <331cd9461412e103d07595a10289de90004ac890
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <47b5ffe86332af95f0f52be0a63d4da7c2b37b55
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4b996a3014ef014af8f97b60c35f5289210a4720
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6c22f86dd221eba0c7af645b1af73dcbc04ee27b
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c97f6d528c3f1c83a6b792a8a7928c236c80b8fe

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0efd9dfc00d677a1d0929319a6103cb2dfc41c22; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <26b7c0ac49a3eea15559c9d84863736a6d1164b4; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <331cd9461412e103d07595a10289de90004ac890; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <47b5ffe86332af95f0f52be0a63d4da7c2b37b55; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4b996a3014ef014af8f97b60c35f5289210a4720; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6c22f86dd221eba0c7af645b1af73dcbc04ee27b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c97f6d528c3f1c83a6b792a8a7928c236c80b8fe

Published CVSS scores

4.7NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Amazon LinuxCVSS: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

T1499Endpoint Denial of Service

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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