# CVE-2026-49428

## Summary

- **CVE ID:** CVE-2026-49428
- **Severity:** HIGH
- **CVSS Score:** 8.4 (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-915
- **Published:** Aug 19, 2026
- **Last Modified:** Aug 20, 2026

## 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.

## Affected Products

- FreeBSD — FreeBSD (15.1-RELEASE)
- FreeBSD — FreeBSD (15.0-RELEASE)
- FreeBSD — FreeBSD (14.4-RELEASE)
- FreeBSD — FreeBSD (14.3-RELEASE)

## References

- [CNA](https://security.freebsd.org/advisories/FreeBSD-SA-26:44.posixshm.asc)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.29%
- **EPSS Percentile:** 21.4

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._