CVE-2024-26955

Kernel crash via unmapped nilfs2 buffer read

Published May 1, 2024 · Updated May 11, 2026

Kernel denial of service in Linux allows local users to crash the system through write activity on a mounted nilfs2 filesystem. nilfs_get_block returns success after block lookup and insertion both fail inconsistently, causing __block_write_begin_int to request a read into an unmapped buffer. Reachability requires local filesystem access and the unexpected race; submit_bh_wbc then fails its BH_Mapped BUG_ON check.

CVSS severity7.8
High
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

Kernel denial of service in Linux allows local users to crash the system through write activity on a mounted nilfs2 filesystem. nilfs_get_block returns success after block lookup and insertion both fail inconsistently, causing __block_write_begin_int to request a read into an unmapped buffer. Reachability requires local filesystem access and the unexpected race; submit_bh_wbc then fails its BH_Mapped BUG_ON check.

The record

CVE
CVE-2024-26955
Published
May 1, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
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=1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b <0c8aa4cfda4e4adb15d5b6536d155eca9c9cd44c
  2. Affected versionversion=1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b <192e9f9078c96be30b31c4b44d6294b24520fce5
  3. Affected versionversion=1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b <269cdf353b5bdd15f1a079671b0f889113865f20
  4. Affected versionversion=1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b <32eaee72e96590a75445c8a6c7c1057673b47e07
  5. Affected versionversion=1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b <48d443d200237782dc82e6b60663ec414ef02e39
  6. Affected versionversion=1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b <76ffbe911e2798c7296968f5fd72f7bf67207a8d
  7. Affected versionversion=1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b <91e4c4595fae5e87069e44687ae879091783c183
  8. Affected versionversion=1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b <ca581d237f3b8539c044205bb003de71d75d227c
  9. Affected versionversion=1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b <f0fe7ad5aff4f0fcf988913313c497de85f1e186
  10. Affected versionversion=2.6.30

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b <0c8aa4cfda4e4adb15d5b6536d155eca9c9cd44c; version=1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b <192e9f9078c96be30b31c4b44d6294b24520fce5; version=1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b <269cdf353b5bdd15f1a079671b0f889113865f20; version=1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b <32eaee72e96590a75445c8a6c7c1057673b47e07; version=1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b <48d443d200237782dc82e6b60663ec414ef02e39; version=1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b <76ffbe911e2798c7296968f5fd72f7bf67207a8d; version=1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b <91e4c4595fae5e87069e44687ae879091783c183; version=1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b <ca581d237f3b8539c044205bb003de71d75d227c; version=1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b <f0fe7ad5aff4f0fcf988913313c497de85f1e186; version=2.6.30

Published CVSS scores

7.8NVDCVSS: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

T1499.004Application or System Exploitation

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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