CVE-2026-74610

Local kernel crash via unpushed kTLS record

Published Aug 22, 2026 · Updated Aug 25, 2026

Out-of-bounds write in the Linux kernel kTLS send path allows local users to crash the system through a loopback socket. tls_sw_sendmsg_locked() fails to set full_record when the plaintext sk_msg ring fills, so a later splice() wraps ring indexes and overwrites live entries. Triggering the flaw requires an unprivileged local process to attach the tls ULP to a loopback TCP socket and drive the copy-then-splice sequence, ending in a kernel NULL-pointer dereference and system crash.

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

Out-of-bounds write in the Linux kernel kTLS send path allows local users to crash the system through a loopback socket. tls_sw_sendmsg_locked() fails to set full_record when the plaintext sk_msg ring fills, so a later splice() wraps ring indexes and overwrites live entries. Triggering the flaw requires an unprivileged local process to attach the tls ULP to a loopback TCP socket and drive the copy-then-splice sequence, ending in a kernel NULL-pointer dereference and system crash.

The record

CVE
CVE-2026-74610
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787, T1499
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=6.5
  2. Affected versionversion=fe1e81d4f73b6cbaed4fcc476960d26770642842 <3c5f8f2aa57c647b83add4896aab64aac5fdedad
  3. Affected versionversion=fe1e81d4f73b6cbaed4fcc476960d26770642842 <3fc5044796dd87b8d68be4207046f5ce2748174c
  4. Affected versionversion=fe1e81d4f73b6cbaed4fcc476960d26770642842 <7bca91d63341274e857f4aeaad54d229405e93dc
  5. Affected versionversion=fe1e81d4f73b6cbaed4fcc476960d26770642842 <aa8b14647721b5a4958712b35cf43e3125d47753
  6. Affected versionversion=fe1e81d4f73b6cbaed4fcc476960d26770642842 <f634289a0b557a197c5f37284b623cefedfe73d5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.5; version=fe1e81d4f73b6cbaed4fcc476960d26770642842 <3c5f8f2aa57c647b83add4896aab64aac5fdedad; version=fe1e81d4f73b6cbaed4fcc476960d26770642842 <3fc5044796dd87b8d68be4207046f5ce2748174c; version=fe1e81d4f73b6cbaed4fcc476960d26770642842 <7bca91d63341274e857f4aeaad54d229405e93dc; version=fe1e81d4f73b6cbaed4fcc476960d26770642842 <aa8b14647721b5a4958712b35cf43e3125d47753; version=fe1e81d4f73b6cbaed4fcc476960d26770642842 <f634289a0b557a197c5f37284b623cefedfe73d5

Published CVSS scores

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-787Out-of-bounds Write
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

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