CVE-2026-74371

Local memory corruption via undersized BPF_PROG_QUERY buffer

Published Aug 15, 2026 · Updated Aug 15, 2026

Out-of-bounds write in Linux kernel 6.17.0 through 6.18.39 and 6.19.0 through 7.1.4 allows local users to corrupt memory via BPF_PROG_QUERY. The cgroup query path unconditionally copies the late query.revision field to userspace without checking the caller-supplied bpf_attr size, writing beyond legacy 40-byte buffers. Exploitation requires a local low-privileged account able to issue the query and results in memory corruption that interrupts system availability.

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 write in Linux kernel 6.17.0 through 6.18.39 and 6.19.0 through 7.1.4 allows local users to corrupt memory via BPF_PROG_QUERY. The cgroup query path unconditionally copies the late query.revision field to userspace without checking the caller-supplied bpf_attr size, writing beyond legacy 40-byte buffers. Exploitation requires a local low-privileged account able to issue the query and results in memory corruption that interrupts system availability.

The record

CVE
CVE-2026-74371
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=1209339844601ec1766f4ff430673fbcfe42bb51 <21c4b99b27f3f85b89256e81b3e997dec0a460d0
  2. Affected versionversion=1209339844601ec1766f4ff430673fbcfe42bb51 <a7131340d0f95df9a541257dccab5d85e6bcdd2b
  3. Affected versionversion=1209339844601ec1766f4ff430673fbcfe42bb51 <d3d630e8a7f3421bc2d204b87bdff35b4432a8e3
  4. Affected versionversion=6.17

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1209339844601ec1766f4ff430673fbcfe42bb51 <21c4b99b27f3f85b89256e81b3e997dec0a460d0; version=1209339844601ec1766f4ff430673fbcfe42bb51 <a7131340d0f95df9a541257dccab5d85e6bcdd2b; version=1209339844601ec1766f4ff430673fbcfe42bb51 <d3d630e8a7f3421bc2d204b87bdff35b4432a8e3; version=6.17

Published CVSS scores

6.9SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
6.1SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

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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