CVE-2026-90419

Kernel memory disclosure or crash via malformed super-root

Published Sep 17, 2026 · Updated Sep 18, 2026

Out-of-bounds read in Linux nilfs2 allows attackers to disclose kernel memory or crash the system through a crafted filesystem image. nilfs_store_disk_layout trusts the super-root inode size, so nilfs_read_inode_common reads beyond the super-root block when its computed footprint exceeds the block size. Exploitation requires a victim or automounter with initial-namespace CAP_SYS_ADMIN to mount the image; attackers need no host account, and the bounded consequences are memory disclosure and a kernel oops.

CVSS severity7.1
High
EPSS probability0.18%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Linux nilfs2 allows attackers to disclose kernel memory or crash the system through a crafted filesystem image. nilfs_store_disk_layout trusts the super-root inode size, so nilfs_read_inode_common reads beyond the super-root block when its computed footprint exceeds the block size. Exploitation requires a victim or automounter with initial-namespace CAP_SYS_ADMIN to mount the image; attackers need no host account, and the bounded consequences are memory disclosure and a kernel oops.

The record

CVE
CVE-2026-90419
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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=2.6.30
  2. Affected versionversion=8a9d2191e9f43bbcd256a9a6871bd73434c83f2f <15c8559376416a84c3d8402fd8d0c89bb323d05f
  3. Affected versionversion=8a9d2191e9f43bbcd256a9a6871bd73434c83f2f <16df2520502867a4f34e202b89d01243d59bb8b5
  4. Affected versionversion=8a9d2191e9f43bbcd256a9a6871bd73434c83f2f <5b69ebe20d7f944c1f45177dca0c11474ac277cc
  5. Affected versionversion=8a9d2191e9f43bbcd256a9a6871bd73434c83f2f <7029e70cf86d5c54c0a2812479b0bee2cabcbaaa
  6. Affected versionversion=8a9d2191e9f43bbcd256a9a6871bd73434c83f2f <71bd64471ff583101b4a33dfc838ce29aef57960
  7. Affected versionversion=8a9d2191e9f43bbcd256a9a6871bd73434c83f2f <7cb2f76a6a2ba2130b577cb8ac13e1e46c4fc689
  8. Affected versionversion=8a9d2191e9f43bbcd256a9a6871bd73434c83f2f <842397fdfd2e61d6470166c796f3125b6c27a162
  9. Affected versionversion=8a9d2191e9f43bbcd256a9a6871bd73434c83f2f <dcc85fc28f884038735464f6f104dda9c7dbfad6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.30; version=8a9d2191e9f43bbcd256a9a6871bd73434c83f2f <15c8559376416a84c3d8402fd8d0c89bb323d05f; version=8a9d2191e9f43bbcd256a9a6871bd73434c83f2f <16df2520502867a4f34e202b89d01243d59bb8b5; version=8a9d2191e9f43bbcd256a9a6871bd73434c83f2f <5b69ebe20d7f944c1f45177dca0c11474ac277cc; version=8a9d2191e9f43bbcd256a9a6871bd73434c83f2f <7029e70cf86d5c54c0a2812479b0bee2cabcbaaa; version=8a9d2191e9f43bbcd256a9a6871bd73434c83f2f <71bd64471ff583101b4a33dfc838ce29aef57960; version=8a9d2191e9f43bbcd256a9a6871bd73434c83f2f <7cb2f76a6a2ba2130b577cb8ac13e1e46c4fc689; version=8a9d2191e9f43bbcd256a9a6871bd73434c83f2f <842397fdfd2e61d6470166c796f3125b6c27a162; version=8a9d2191e9f43bbcd256a9a6871bd73434c83f2f <dcc85fc28f884038735464f6f104dda9c7dbfad6

Published CVSS scores

7.1Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
4.4Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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