CVE-2026-49425

Kernel stack disclosure via uninitialized kevent32 copyout

Published Aug 19, 2026 · Updated Aug 19, 2026

Information disclosure in FreeBSD allows local users to read uninitialized kernel stack data via compat32 kevent() translation. In sys/compat/freebsd32/freebsd32_misc.c, freebsd32_kevent_copyout() used a stack array of struct kevent32 without zero-initializing it before translating and copying fields for return to user space. Exposure requires local execution on affected amd64 or arm64 systems with 32-bit compatibility support enabled, and the published impact is limited to disclosure of a small amount of kernel memory.

CVSS severityUnavailable
Unscored
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in FreeBSD allows local users to read uninitialized kernel stack data via compat32 kevent() translation. In sys/compat/freebsd32/freebsd32_misc.c, freebsd32_kevent_copyout() used a stack array of struct kevent32 without zero-initializing it before translating and copying fields for return to user space. Exposure requires local execution on affected amd64 or arm64 systems with 32-bit compatibility support enabled, and the published impact is limited to disclosure of a small amount of kernel memory.

The record

CVE
CVE-2026-49425
Published
Aug 19, 2026
Updated
Aug 19, 2026
Vendor
The FreeBSD Project
Product
FreeBSD
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 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 <p16
  2. Affected versionversion=14.4-RELEASE <p7
  3. Affected versionversion=15.0-RELEASE <p11

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The FreeBSD Project · FreeBSDversion=14.3-RELEASE <p16; version=14.4-RELEASE <p7; version=15.0-RELEASE <p11

Published CVSS scores

No CVSS assessment is available in this record.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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