CVE-2022-48901

Filesystem-operation interruption via premature Btrfs relocation

Published Aug 22, 2024 · Updated May 11, 2026

Race condition in Linux kernel Btrfs allows local users to interrupt filesystem operations when relocation resumes during snapshot recovery. After a crash leaves a half-deleted snapshot with a drop_progress key, balance can start relocation before the cleaner finishes because the dead root is queued without blocking balance. Reaching the fault requires a pending balance, concurrent snapshot deletion, and a crash; the observed consequence is an extent-item lookup warning and failed filesystem work.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux kernel Btrfs allows local users to interrupt filesystem operations when relocation resumes during snapshot recovery. After a crash leaves a half-deleted snapshot with a drop_progress key, balance can start relocation before the cleaner finishes because the dead root is queued without blocking balance. Reaching the fault requires a pending balance, concurrent snapshot deletion, and a crash; the observed consequence is an extent-item lookup warning and failed filesystem work.

The record

CVE
CVE-2022-48901
Published
Aug 22, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=3.10
  2. Affected versionversion=9d1a2a3ad59f7ae810bf04a5a05995bf2d79300c <5e70bc827b563caf22e1203428cc3719643de5aa
  3. Affected versionversion=9d1a2a3ad59f7ae810bf04a5a05995bf2d79300c <6599d5e8bd758d897fd2ef4dc388ae50278b1f7e
  4. Affected versionversion=9d1a2a3ad59f7ae810bf04a5a05995bf2d79300c <b4be6aefa73c9a6899ef3ba9c5faaa8a66e333ef

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.10; version=9d1a2a3ad59f7ae810bf04a5a05995bf2d79300c <5e70bc827b563caf22e1203428cc3719643de5aa; version=9d1a2a3ad59f7ae810bf04a5a05995bf2d79300c <6599d5e8bd758d897fd2ef4dc388ae50278b1f7e; version=9d1a2a3ad59f7ae810bf04a5a05995bf2d79300c <b4be6aefa73c9a6899ef3ba9c5faaa8a66e333ef

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 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

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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