CVE-2026-74671

Out-of-bounds read via unsigned digest-length underflow

Published Aug 22, 2026 · Updated Aug 22, 2026

Out-of-bounds read in affected Linux kernel releases from 3.13 allows local users to trigger invalid memory access via a truncated security.ima value. In xattr_verify(), sizeof() promotes the digest-length subtraction to size_t, so a one-byte value underflows to SIZE_MAX and lets memcmp() read beyond the buffer allocated by vfs_getxattr_alloc(). Reachability requires local low-privileged access and an IMA appraisal path that accepts the truncated attribute; the records establish availability impact but do not specify a crash, hang, or other service-interruption mode.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds read in affected Linux kernel releases from 3.13 allows local users to trigger invalid memory access via a truncated security.ima value. In xattr_verify(), sizeof() promotes the digest-length subtraction to size_t, so a one-byte value underflows to SIZE_MAX and lets memcmp() read beyond the buffer allocated by vfs_getxattr_alloc(). Reachability requires local low-privileged access and an IMA appraisal path that accepts the truncated attribute; the records establish availability impact but do not specify a crash, hang, or other service-interruption mode.

The record

CVE
CVE-2026-74671
Published
Aug 22, 2026
Updated
Aug 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-192, CWE-125
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.13
  2. Affected versionversion=3ea7a56067e663278470c04fd655adf809e72d4d <27f3924061592d0ef6b04e16f48754b6cb6adf27
  3. Affected versionversion=3ea7a56067e663278470c04fd655adf809e72d4d <5ff232d31106f45ac87c3b64e1d35a0667777797
  4. Affected versionversion=3ea7a56067e663278470c04fd655adf809e72d4d <7e515b6c9aab452a4f0734bd7208e4e780e164ca
  5. Affected versionversion=3ea7a56067e663278470c04fd655adf809e72d4d <a784b4732ac7e51862b9b210c2d8b2ab9e83568c
  6. Affected versionversion=3ea7a56067e663278470c04fd655adf809e72d4d <b6cb134707a2127d90a58d69dd818679cae8033c
  7. Affected versionversion=3ea7a56067e663278470c04fd655adf809e72d4d <caeb105c15ea2431fa8da7ecfa242d0c68272426
  8. Affected versionversion=3ea7a56067e663278470c04fd655adf809e72d4d <d823b5f4557083d1dd92096f796a78a2b1b06d10
  9. Affected versionversion=3ea7a56067e663278470c04fd655adf809e72d4d <dd04114af0d451091f7b8cbd26d9e37d011e9131

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.13; version=3ea7a56067e663278470c04fd655adf809e72d4d <27f3924061592d0ef6b04e16f48754b6cb6adf27; version=3ea7a56067e663278470c04fd655adf809e72d4d <5ff232d31106f45ac87c3b64e1d35a0667777797; version=3ea7a56067e663278470c04fd655adf809e72d4d <7e515b6c9aab452a4f0734bd7208e4e780e164ca; version=3ea7a56067e663278470c04fd655adf809e72d4d <a784b4732ac7e51862b9b210c2d8b2ab9e83568c; version=3ea7a56067e663278470c04fd655adf809e72d4d <b6cb134707a2127d90a58d69dd818679cae8033c; version=3ea7a56067e663278470c04fd655adf809e72d4d <caeb105c15ea2431fa8da7ecfa242d0c68272426; version=3ea7a56067e663278470c04fd655adf809e72d4d <d823b5f4557083d1dd92096f796a78a2b1b06d10; version=3ea7a56067e663278470c04fd655adf809e72d4d <dd04114af0d451091f7b8cbd26d9e37d011e9131

Published CVSS scores

5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

CWE-192Integer Coercion Error
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo