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.
Published: 2026-08-19
Score: n/a
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
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Remediation

No vendor fix or workaround currently provided.

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History

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

Subscriptions

Freebsd Freebsd
cve-icon MITRE

Status: PUBLISHED

Assigner: freebsd

Published:

Updated: 2026-08-19T05:57:04.674Z

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

Link: CVE-2026-49428

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

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

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

Link: CVE-2026-49428

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-19T13:30:04Z

Weaknesses
  • CWE-915

    Improperly Controlled Modification of Dynamically-Determined Object Attributes