CVE-2026-74627

Kernel compromise via mixed socket-buffer fragments

Published Aug 22, 2026 · Updated Aug 25, 2026

Type confusion in Linux kernel 6.16 allows local users to compromise kernel memory or crash the system through crafted TCP sends. zerocopy_fill_skb_from_devmem() permits net_iov and page-backed fragments in one socket buffer, while downstream fragment walkers assume a single backing type. Exploitation requires a netmem_tx-capable NIC, zero-copy TCP, a DMA-BUF binding, and low-privilege local access capable of obtaining CAP_NET_ADMIN in a user namespace.

CVSS severity7.8
High
EPSS probability0.13%
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

Type confusion in Linux kernel 6.16 allows local users to compromise kernel memory or crash the system through crafted TCP sends. zerocopy_fill_skb_from_devmem() permits net_iov and page-backed fragments in one socket buffer, while downstream fragment walkers assume a single backing type. Exploitation requires a netmem_tx-capable NIC, zero-copy TCP, a DMA-BUF binding, and low-privilege local access capable of obtaining CAP_NET_ADMIN in a user namespace.

The record

CVE
CVE-2026-74627
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-843, T1068, T1499.004
Attack vector
local
Privileges
authenticated

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

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=6.16
  2. Affected versionversion=bd61848900bff597764238f3a8ec67c815cd316e <53a43508ee332d8bffe40590c3d189c92a551f9f
  3. Affected versionversion=bd61848900bff597764238f3a8ec67c815cd316e <e9bfe12b1d04c34c6fedcba21d9709b65c08aa33
  4. Affected versionversion=bd61848900bff597764238f3a8ec67c815cd316e <ed08011ae0be88f16cceae190535d6c790c83b0c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.16; version=bd61848900bff597764238f3a8ec67c815cd316e <53a43508ee332d8bffe40590c3d189c92a551f9f; version=bd61848900bff597764238f3a8ec67c815cd316e <e9bfe12b1d04c34c6fedcba21d9709b65c08aa33; version=bd61848900bff597764238f3a8ec67c815cd316e <ed08011ae0be88f16cceae190535d6c790c83b0c

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 CVE TeamCVSS: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.

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

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-843Access of Resource Using Incompatible Type ('Type Confusion')
T1068Exploitation for Privilege Escalation
T1499.004Application or System Exploitation

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