CVE-2026-74689

Kernel disclosure and crash via bypassed length validation

Published Aug 22, 2026 · Updated Aug 25, 2026

Out-of-bounds read in the Linux ATM subsystem allows local users to disclose kernel memory or crash the host through setsockopt. An ineffective optlen check in vcc_setsockopt() can be bypassed by a mismatched level or a cgroup BPF filter, causing copy_from_sockptr() to read past a short kernel buffer. Any unprivileged local user in the initial network namespace can reach the syscall without user interaction; the bounded effects are disclosure and a kernel oops or panic.

CVSS severity7.1
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 the Linux ATM subsystem allows local users to disclose kernel memory or crash the host through setsockopt. An ineffective optlen check in vcc_setsockopt() can be bypassed by a mismatched level or a cgroup BPF filter, causing copy_from_sockptr() to read past a short kernel buffer. Any unprivileged local user in the initial network namespace can reach the syscall without user interaction; the bounded effects are disclosure and a kernel oops or panic.

The record

CVE
CVE-2026-74689
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-805, T1005
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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 <2c5988c7349c0b64a7e0441bfc6e1dca54f7116a
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <35f258fee9ed358c6d0f57f91c30bf029c3724af
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6eb6af88710977eb529b558a07294874d8c40c4d
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9f77c1ab382188f5b51982fab6d913443b6dc59f
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b3bcd5d65ac03c15787b2a5b36c718e26a689336
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d0c80dbb970439bd2eeb0e5effff8c16a5f4e1e3
  7. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2c5988c7349c0b64a7e0441bfc6e1dca54f7116a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <35f258fee9ed358c6d0f57f91c30bf029c3724af; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6eb6af88710977eb529b558a07294874d8c40c4d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9f77c1ab382188f5b51982fab6d913443b6dc59f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b3bcd5d65ac03c15787b2a5b36c718e26a689336; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d0c80dbb970439bd2eeb0e5effff8c16a5f4e1e3; version=2.6.12

Published CVSS scores

5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.1LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
3.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-805Buffer Access with Incorrect Length Value
T1005Data from Local System

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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