CVE-2026-74256

Kernel crash via wrapped BPF message bounds

Published Aug 15, 2026 · Updated Aug 15, 2026

Integer overflow in Linux kernel BPF sockmap handling allows local users to crash the kernel through crafted message data. bpf_msg_pop_data() adds two u32 values before assigning the result to u64, letting wraparound pass its bounds check and drive the pop loop beyond the scatterlist. A local process must exercise a sockmap-attached BPF message-verdict path; successful exploitation produces a kernel fault and service interruption.

CVSS severity8.4
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Linux kernel BPF sockmap handling allows local users to crash the kernel through crafted message data. bpf_msg_pop_data() adds two u32 values before assigning the result to u64, letting wraparound pass its bounds check and drive the pop loop beyond the scatterlist. A local process must exercise a sockmap-attached BPF message-verdict path; successful exploitation produces a kernel fault and service interruption.

The record

CVE
CVE-2026-74256
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
unauthenticated

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=5.0
  2. Affected versionversion=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <17eb9832a10db2f7a80cb429ca2bc5038445a943
  3. Affected versionversion=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <9ef44ed6fb0c1db01cfcc3de432a33e719713eb5
  4. Affected versionversion=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <a48802fb2cd2d1e23651989f8ff4d15e9d5dad54
  5. Affected versionversion=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <ba5cc05dae8fce237d191c7ea96b1107a791e548
  6. Affected versionversion=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <c05a0ec1cdced622a1a0c7d85679fe02f31033ec
  7. Affected versionversion=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <d693c5ed67dabe1ccbf8dcea93075bdc9ffd4ca0
  8. Affected versionversion=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <e09f7bd7273928b4089e6b71f8e992f2b356ca1b
  9. Affected versionversion=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <fe09dd288722f1c749b7506c0b3e7841a7d85027

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.0; version=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <17eb9832a10db2f7a80cb429ca2bc5038445a943; version=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <9ef44ed6fb0c1db01cfcc3de432a33e719713eb5; version=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <a48802fb2cd2d1e23651989f8ff4d15e9d5dad54; version=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <ba5cc05dae8fce237d191c7ea96b1107a791e548; version=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <c05a0ec1cdced622a1a0c7d85679fe02f31033ec; version=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <d693c5ed67dabe1ccbf8dcea93075bdc9ffd4ca0; version=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <e09f7bd7273928b4089e6b71f8e992f2b356ca1b; version=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <fe09dd288722f1c749b7506c0b3e7841a7d85027

Published CVSS scores

5.6Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
8.4Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.0Red HatCVSS:3.1/AV:L/AC:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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