CVE-2022-50300

Kernel memory corruption via freed extent-map dereference

Published Sep 15, 2025 · Updated Sep 15, 2025

Use-after-free in Linux btrfs allows local users to corrupt kernel memory when a crafted multi-device filesystem is mounted. read_one_chunk frees the extent map before reading map->stripes[i].dev to derive its error code, dereferencing freed storage. The path requires a chunk on a missing device and a mount without the degraded option; successful exploitation affects the host kernel.

CVSS severity7.8
High
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-after-free in Linux btrfs allows local users to corrupt kernel memory when a crafted multi-device filesystem is mounted. read_one_chunk frees the extent map before reading map->stripes[i].dev to derive its error code, dereferencing freed storage. The path requires a chunk on a missing device and a mount without the degraded option; successful exploitation affects the host kernel.

The record

CVE
CVE-2022-50300
Published
Sep 15, 2025
Updated
Sep 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 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=4.15
  2. Affected versionversion=adfb69af7d8cb6a3958f75aad1ef4bc96891d116 <169a4cf46882974d4db6d85eb623ec898e51bbc0
  3. Affected versionversion=adfb69af7d8cb6a3958f75aad1ef4bc96891d116 <1742e1c90c3da344f3bb9b1f1309b3f47482756a
  4. Affected versionversion=adfb69af7d8cb6a3958f75aad1ef4bc96891d116 <b8e7ed42bc3ca0d0e4191ee394d34962d3624c22
  5. Affected versionversion=adfb69af7d8cb6a3958f75aad1ef4bc96891d116 <fce3713197ebba239e1c7e02174ed216ea1ee014

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.15; version=adfb69af7d8cb6a3958f75aad1ef4bc96891d116 <169a4cf46882974d4db6d85eb623ec898e51bbc0; version=adfb69af7d8cb6a3958f75aad1ef4bc96891d116 <1742e1c90c3da344f3bb9b1f1309b3f47482756a; version=adfb69af7d8cb6a3958f75aad1ef4bc96891d116 <b8e7ed42bc3ca0d0e4191ee394d34962d3624c22; version=adfb69af7d8cb6a3958f75aad1ef4bc96891d116 <fce3713197ebba239e1c7e02174ed216ea1ee014

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Linux kernel CVE teamCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

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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