CVE-2024-42149

Service interruption via thaw-operation warning race

Published Jul 30, 2024 · Updated May 11, 2026

Race-condition handling in Linux kernel 6.8 allows local users to interrupt service through concurrent block-device thaw and mount operations. During fs_bdev_thaw(), get_bdev_super() can validly return NULL after an aborting mount drops its final active reference, but the code passes that result to WARN_ON_ONCE instead of returning EINVAL quietly. Triggering the race requires privileged device-mapper and mount operations; the warning crashes the host only when panic_on_warn is enabled.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race-condition handling in Linux kernel 6.8 allows local users to interrupt service through concurrent block-device thaw and mount operations. During fs_bdev_thaw(), get_bdev_super() can validly return NULL after an aborting mount drops its final active reference, but the code passes that result to WARN_ON_ONCE instead of returning EINVAL quietly. Triggering the race requires privileged device-mapper and mount operations; the warning crashes the host only when panic_on_warn is enabled.

The record

CVE
CVE-2024-42149
Published
Jul 30, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 30, 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=49ef8832fb1a9e0da0020eb17480fd286433bc13 <25b1e3906e050d452427bc51620bb7f0a591373a
  2. Affected versionversion=49ef8832fb1a9e0da0020eb17480fd286433bc13 <2ae4db5647d807efb6a87c09efaa6d1db9c905d7
  3. Affected versionversion=6.8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=49ef8832fb1a9e0da0020eb17480fd286433bc13 <25b1e3906e050d452427bc51620bb7f0a591373a; version=49ef8832fb1a9e0da0020eb17480fd286433bc13 <2ae4db5647d807efb6a87c09efaa6d1db9c905d7; version=6.8

Published CVSS scores

5.5Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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

CWE-476NULL Pointer Dereference
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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