CVE-2026-31449

Kernel memory read via unchecked ext4 index pointer

Published Apr 22, 2026 · Updated Apr 22, 2026

Out-of-bounds read in ext4 in affected Linux Kernel releases allows local users to read kernel memory via a crafted filesystem image. The ext4_ext_correct_indexes() function dereferences path[k].p_idx->ei_block without checking p_idx against EXT_LAST_INDEX(), so crafted eh_entries metadata moves the pointer past the slab buffer. Exploitation requires user interaction to introduce and use the image; the resulting read can disclose adjacent kernel data or interrupt the system.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in ext4 in affected Linux Kernel releases allows local users to read kernel memory via a crafted filesystem image. The ext4_ext_correct_indexes() function dereferences path[k].p_idx->ei_block without checking p_idx against EXT_LAST_INDEX(), so crafted eh_entries metadata moves the pointer past the slab buffer. Exploitation requires user interaction to introduce and use the image; the resulting read can disclose adjacent kernel data or interrupt the system.

The record

CVE
CVE-2026-31449
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <01bf1e0b997d82c0e353b51ed74ef99698043c33
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2acb5c12ebd860f30e4faf67e6cc8c44ddfe5fe8
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <407c944f217c17d4343148011acafebc604d55e1
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <93f2e975ed658ce09db4d4c2877ca2c06540df83

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <01bf1e0b997d82c0e353b51ed74ef99698043c33; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2acb5c12ebd860f30e4faf67e6cc8c44ddfe5fe8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <407c944f217c17d4343148011acafebc604d55e1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <93f2e975ed658ce09db4d4c2877ca2c06540df83

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1204.002User Execution: Malicious File

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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