CVE-2026-45257Public exploit

Local privilege escalation via in-place KTLS decryption

Published Jun 26, 2026 · Updated Jun 26, 2026

Write-what-where in affected FreeBSD KTLS releases allows local users to overwrite readable files and escalate privileges. The receive path decrypts sendfile(2)-originated M_EXTPG or EXT_SFBUF mbufs in place, so attacker-chosen plaintext replaces file-backed page-cache data instead of a private buffer. An unprivileged local user needs read access to the target and a loopback socket with KTLS receive enabled; overwriting a setuid binary grants root-level control.

CVSS severity7.8
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

Write-what-where in affected FreeBSD KTLS releases allows local users to overwrite readable files and escalate privileges. The receive path decrypts sendfile(2)-originated M_EXTPG or EXT_SFBUF mbufs in place, so attacker-chosen plaintext replaces file-backed page-cache data instead of a private buffer. An unprivileged local user needs read access to the target and a loopback socket with KTLS receive enabled; overwriting a setuid binary grants root-level control.

The record

CVE
CVE-2026-45257
Published
Jun 26, 2026
Updated
Jun 26, 2026
Vendor
The FreeBSD Project
Product
FreeBSD
Classifications
CWE-123, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 26, 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=14.3-RELEASE <p15
  2. Affected versionversion=14.4-RELEASE <p6
  3. Affected versionversion=15.0-RELEASE <p10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The FreeBSD Project · FreeBSDversion=14.3-RELEASE <p15; version=14.4-RELEASE <p6; version=15.0-RELEASE <p10

Published CVSS scores

7.8CISA ADPCVSS: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 exploitPublished

Weakness, pattern, technique

CWE-123Write-what-where Condition
T1068Exploitation for Privilege Escalation

Public exploit references

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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