CVE-2026-31614Network attack vector

Kernel heap over-read via off-by-eight bounds check

Published Apr 24, 2026 · Updated Apr 24, 2026

Out-of-bounds read in the Linux Kernel SMB client allows remote attackers controlling an SMB server to influence WSL xattr parsing. The check_wsl_eas() bounds calculation starts at the eight-byte EA header rather than ea_data, so strncmp() reads name or value bytes past the iov end. Exploitation requires the client to parse crafted extended attributes from an untrusted server and exposes up to eight kernel-heap bytes only inside the name comparison.

CVSS severity7.1
High
EPSS probability0.13%
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 the Linux Kernel SMB client allows remote attackers controlling an SMB server to influence WSL xattr parsing. The check_wsl_eas() bounds calculation starts at the eight-byte EA header rather than ea_data, so strncmp() reads name or value bytes past the iov end. Exploitation requires the client to parse crafted extended attributes from an untrusted server and exposes up to eight kernel-heap bytes only inside the name comparison.

The record

CVE
CVE-2026-31614
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 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 <5cc0574c84aa73946ade587c41e81757b8b01cb5
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a893f1757d9a4009e4a8d7ceb2312142fe29cea4
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b2b76d09a64c538c57006180103fc1841e8cfa66
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ba3ad159aa61810bbe0acaf39578b1ebfb6f1a18

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5cc0574c84aa73946ade587c41e81757b8b01cb5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a893f1757d9a4009e4a8d7ceb2312142fe29cea4; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b2b76d09a64c538c57006180103fc1841e8cfa66; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ba3ad159aa61810bbe0acaf39578b1ebfb6f1a18

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read

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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