CVE-2024-26956

Kernel crash via unhandled DAT translation failure

Published May 1, 2024 · Updated May 11, 2026

Denial of service in Linux nilfs2 allows local users to crash the kernel by writing file data to a filesystem with corrupted DAT metadata. nilfs_get_block treats nilfs_dat_translate's -ENOENT result as a missing block and returns success despite leaving the buffer unmapped. Reaching the failing BH_Mapped assertion requires local write access to the corrupted filesystem, and the documented consequence is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux nilfs2 allows local users to crash the kernel by writing file data to a filesystem with corrupted DAT metadata. nilfs_get_block treats nilfs_dat_translate's -ENOENT result as a missing block and returns success despite leaving the buffer unmapped. Reaching the failing BH_Mapped assertion requires local write access to the corrupted filesystem, and the documented consequence is a kernel crash.

The record

CVE
CVE-2024-26956
Published
May 1, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 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=2.6.31
  2. Affected versionversion=c3a7abf06ce719a51139e62a034590be99abbc2c <2e2619ff5d0def4bb6c2037a32a6eaa28dd95c84
  3. Affected versionversion=c3a7abf06ce719a51139e62a034590be99abbc2c <46b832e09d43b394ac0f6d9485d2b1a06593f0b7
  4. Affected versionversion=c3a7abf06ce719a51139e62a034590be99abbc2c <82827ca21e7c8a91384c5baa656f78a5adfa4ab4
  5. Affected versionversion=c3a7abf06ce719a51139e62a034590be99abbc2c <9cbe1ad5f4354f4df1445e5f4883983328cd6d8e
  6. Affected versionversion=c3a7abf06ce719a51139e62a034590be99abbc2c <a8e4d098de1c0f4c5c1f2ed4633a860f0da6d713
  7. Affected versionversion=c3a7abf06ce719a51139e62a034590be99abbc2c <b67189690eb4b7ecc84ae16fa1e880e0123eaa35
  8. Affected versionversion=c3a7abf06ce719a51139e62a034590be99abbc2c <c3b5c5c31e723b568f83d8cafab8629d9d830ffb
  9. Affected versionversion=c3a7abf06ce719a51139e62a034590be99abbc2c <f2f26b4a84a0ef41791bd2d70861c8eac748f4ba
  10. Affected versionversion=c3a7abf06ce719a51139e62a034590be99abbc2c <f69e81396aea66304d214f175aa371f1b5578862

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.31; version=c3a7abf06ce719a51139e62a034590be99abbc2c <2e2619ff5d0def4bb6c2037a32a6eaa28dd95c84; version=c3a7abf06ce719a51139e62a034590be99abbc2c <46b832e09d43b394ac0f6d9485d2b1a06593f0b7; version=c3a7abf06ce719a51139e62a034590be99abbc2c <82827ca21e7c8a91384c5baa656f78a5adfa4ab4; version=c3a7abf06ce719a51139e62a034590be99abbc2c <9cbe1ad5f4354f4df1445e5f4883983328cd6d8e; version=c3a7abf06ce719a51139e62a034590be99abbc2c <a8e4d098de1c0f4c5c1f2ed4633a860f0da6d713; version=c3a7abf06ce719a51139e62a034590be99abbc2c <b67189690eb4b7ecc84ae16fa1e880e0123eaa35; version=c3a7abf06ce719a51139e62a034590be99abbc2c <c3b5c5c31e723b568f83d8cafab8629d9d830ffb; version=c3a7abf06ce719a51139e62a034590be99abbc2c <f2f26b4a84a0ef41791bd2d70861c8eac748f4ba; version=c3a7abf06ce719a51139e62a034590be99abbc2c <f69e81396aea66304d214f175aa371f1b5578862

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5CISA-ADPCVSS: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.

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Technologies

Your stack

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Your stack

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