CVE-2022-49849

Kernel assertion via incorrect btrfs device match

Published May 1, 2025 · Updated May 23, 2026

Improper device matching in Linux btrfs 5.15.54 through 5.15.78 and 5.16 through 6.0.8 allows local users to trigger a kernel assertion. The dev_args_match_device function skips devid comparison when ioctl input sets devid to the sentinel value, so an unrelated device can match. Access to the affected btrfs ioctl is required, and the demonstrated consequence is the assertion failure in fs/btrfs/volumes.c.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper device matching in Linux btrfs 5.15.54 through 5.15.78 and 5.16 through 6.0.8 allows local users to trigger a kernel assertion. The dev_args_match_device function skips devid comparison when ioctl input sets devid to the sentinel value, so an unrelated device can match. Access to the affected btrfs ioctl is required, and the demonstrated consequence is the assertion failure in fs/btrfs/volumes.c.

The record

CVE
CVE-2022-49849
Published
May 1, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-20, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=5.15.54 <5.15.79
  2. Affected versionversion=5.16
  3. Affected versionversion=5578b681fbf2b22d61189a2539efd3009518b328 <c9fe4719c662e0af17eea723cf345e37719fd3c9
  4. Affected versionversion=562d7b1512f7369a19bca2883e2e8672d78f0481 <0fca385d6ebc3cabb20f67bcf8a71f1448bdc001
  5. Affected versionversion=562d7b1512f7369a19bca2883e2e8672d78f0481 <bc6c127c377010f136360552ebf91c2723081c1b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15.54 <5.15.79; version=5.16; version=5578b681fbf2b22d61189a2539efd3009518b328 <c9fe4719c662e0af17eea723cf345e37719fd3c9; version=562d7b1512f7369a19bca2883e2e8672d78f0481 <0fca385d6ebc3cabb20f67bcf8a71f1448bdc001; version=562d7b1512f7369a19bca2883e2e8672d78f0481 <bc6c127c377010f136360552ebf91c2723081c1b

Published CVSS scores

5.5UbuntuCVSS: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-20Improper Input Validation
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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