CVE-2026-49416

Local privilege escalation via wrapped history-size allocation

Published Jun 27, 2026 · Updated Jun 27, 2026

Integer overflow in FreeBSD before 14.3-RELEASE-p15, before 14.4-RELEASE-p6, and before 15.0-RELEASE-p10 allows local users to escalate privileges. The vt(4) CONS_HISTORY ioctl multiplies an inadequately validated history size into a wrapped allocation length, then initializes the undersized heap buffer out of bounds. An unprivileged local account with access to a vt(4) device can corrupt kernel heap memory and gain elevated privileges.

CVSS severity7.8
High
EPSS probability0.15%
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 FreeBSD before 14.3-RELEASE-p15, before 14.4-RELEASE-p6, and before 15.0-RELEASE-p10 allows local users to escalate privileges. The vt(4) CONS_HISTORY ioctl multiplies an inadequately validated history size into a wrapped allocation length, then initializes the undersized heap buffer out of bounds. An unprivileged local account with access to a vt(4) device can corrupt kernel heap memory and gain elevated privileges.

The record

CVE
CVE-2026-49416
Published
Jun 27, 2026
Updated
Jun 27, 2026
Vendor
The FreeBSD Project
Product
FreeBSD
Classifications
CWE-190, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 27, 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1068Exploitation for Privilege Escalation

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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