CVE-2024-26601

Filesystem corruption via duplicate block freeing

Published Feb 24, 2024 · Updated Aug 5, 2026

Filesystem metadata corruption in Linux allows local users to corrupt ext4 allocation state by mounting a crafted fast-commit image. During replay in fs/ext4/mballoc.c, mb_free_blocks() can mark already-free blocks free again without regenerating the allocator's buddy bitmap, leaving its free-space views inconsistent. Reachability requires a locally supplied block device or mountable image with fast-commit records; subsequent allocation can expose or overwrite file data or panic the host.

CVSS severity7.8
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Filesystem metadata corruption in Linux allows local users to corrupt ext4 allocation state by mounting a crafted fast-commit image. During replay in fs/ext4/mballoc.c, mb_free_blocks() can mark already-free blocks free again without regenerating the allocator's buddy bitmap, leaving its free-space views inconsistent. Reachability requires a locally supplied block device or mountable image with fast-commit records; subsequent allocation can expose or overwrite file data or panic the host.

The record

CVE
CVE-2024-26601
Published
Feb 24, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 24, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=0983142c5f17a62055ec851372273c3bc77e4788 <94ebf71bddbcd4ab1ce43ae32c6cb66396d2d51a
  2. Affected versionversion=5.10.181 <5.10.211
  3. Affected versionversion=5.11
  4. Affected versionversion=6bd97bf273bdb4944904e57480f6545bca48ad77 <6b0d48647935e4b8c7b75d1eccb9043fcd4ee581
  5. Affected versionversion=6bd97bf273bdb4944904e57480f6545bca48ad77 <78327acd4cdc4a1601af718b781eece577b6b7d4
  6. Affected versionversion=6bd97bf273bdb4944904e57480f6545bca48ad77 <c1317822e2de80e78f137d3a2d99febab1b80326
  7. Affected versionversion=6bd97bf273bdb4944904e57480f6545bca48ad77 <c9b528c35795b711331ed36dc3dbee90d5812d4e
  8. Affected versionversion=6bd97bf273bdb4944904e57480f6545bca48ad77 <ea42d6cffb0dd27a417f410b9d0011e9859328cb

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0983142c5f17a62055ec851372273c3bc77e4788 <94ebf71bddbcd4ab1ce43ae32c6cb66396d2d51a; version=5.10.181 <5.10.211; version=5.11; version=6bd97bf273bdb4944904e57480f6545bca48ad77 <6b0d48647935e4b8c7b75d1eccb9043fcd4ee581; version=6bd97bf273bdb4944904e57480f6545bca48ad77 <78327acd4cdc4a1601af718b781eece577b6b7d4; version=6bd97bf273bdb4944904e57480f6545bca48ad77 <c1317822e2de80e78f137d3a2d99febab1b80326; version=6bd97bf273bdb4944904e57480f6545bca48ad77 <c9b528c35795b711331ed36dc3dbee90d5812d4e; version=6bd97bf273bdb4944904e57480f6545bca48ad77 <ea42d6cffb0dd27a417f410b9d0011e9859328cb

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/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 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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