CVE-2026-31716

Kernel memory corruption via unchecked journal record size

Published May 1, 2026 · Updated May 1, 2026

Out-of-bounds memory corruption in the Linux Kernel allows attackers to crash or compromise the kernel via a crafted NTFS filesystem. NTFS3 check_file_record() leaves rec->used unbounded, and journal-replay handlers subtract offsets from that disk value to derive oversized memmove lengths into a 4 KB record buffer. Exploitation requires a target or user to process the corrupted filesystem so journal replay runs; direct mounting requires CAP_SYS_ADMIN.

CVSS severity7.8
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 memory corruption in the Linux Kernel allows attackers to crash or compromise the kernel via a crafted NTFS filesystem. NTFS3 check_file_record() leaves rec->used unbounded, and journal-replay handlers subtract offsets from that disk value to derive oversized memmove lengths into a 4 KB record buffer. Exploitation requires a target or user to process the corrupted filesystem so journal replay runs; direct mounting requires CAP_SYS_ADMIN.

The record

CVE
CVE-2026-31716
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 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=5.15
  2. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <0112e6279420d4005b3d57af36fb45c01b8d0116
  3. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <0ca0485e4b2e837ebb6cbd4f2451aba665a03e4b
  4. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <4b1613d7e2deda831a97e427d1ea586e50fe1be5
  5. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <f79d0403ea20a81bc29105bba54fbcab54e8c403
  6. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <f90b8a1798b750755a9e9aee66678f0a1820bbaf

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.15; version=b46acd6a6a627d876898e1c84d3f84902264b445 <0112e6279420d4005b3d57af36fb45c01b8d0116; version=b46acd6a6a627d876898e1c84d3f84902264b445 <0ca0485e4b2e837ebb6cbd4f2451aba665a03e4b; version=b46acd6a6a627d876898e1c84d3f84902264b445 <4b1613d7e2deda831a97e427d1ea586e50fe1be5; version=b46acd6a6a627d876898e1c84d3f84902264b445 <f79d0403ea20a81bc29105bba54fbcab54e8c403; version=b46acd6a6a627d876898e1c84d3f84902264b445 <f90b8a1798b750755a9e9aee66678f0a1820bbaf

Published CVSS scores

7.8LinuxCVSS: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

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
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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