Certain system calls, such open(2) with the O_TRUNC flag set, and fspacectl(2), could incorrectly free memory in largepage objects. These operations are not permitted on largepage objects, but the implementation did not verify this.

An unprivileged local user can abuse the bug to access freed kernel memory. This can be exploited to escalate privileges.
Advisories

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Fixes

Solution

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Workaround

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History

Thu, 20 Aug 2026 05:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 19 Aug 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 8.4, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Wed, 19 Aug 2026 13:45:00 +0000

Type Values Removed Values Added
First Time appeared Freebsd
Freebsd freebsd
Vendors & Products Freebsd
Freebsd freebsd

Wed, 19 Aug 2026 06:00:00 +0000

Type Values Removed Values Added
Description Certain system calls, such open(2) with the O_TRUNC flag set, and fspacectl(2), could incorrectly free memory in largepage objects. These operations are not permitted on largepage objects, but the implementation did not verify this. An unprivileged local user can abuse the bug to access freed kernel memory. This can be exploited to escalate privileges.
Title posixshm: system calls can incorrectly free memory of largepage objects
Weaknesses CWE-915
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: freebsd

Published:

Updated: 2026-08-20T03:55:45.923Z

Reserved: 2026-05-29T20:24:28.616Z

Link: CVE-2026-49428

cve-icon Vulnrichment

Updated: 2026-08-19T11:59:06.870Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-08-19T06:17:42.263

Modified: 2026-08-26T16:54:50.030

Link: CVE-2026-49428

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-20T13:45:03Z

Weaknesses