posixshm: system calls can incorrectly free memory of largepage objects (CVE-2026-49428) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-49428

posixshm: system calls can incorrectly free memory of largepage objects

Answer in brief

CVE-2026-49428 records a Unknown severity vulnerability in posixshm: system calls can incorrectly free memory of largepage objects. The current sources do not mark it as known exploited. The current feed maps FreeBSD/FreeBSD (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 19, 2026Updated Aug 19, 2026Source checked Aug 19, 2026First seen by HOL Aug 19, 2026Material review Aug 19, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps FreeBSD/FreeBSD (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
FreeBSD/FreeBSDgeneric	>=15.1-RELEASE <p1 \|\| >=15.0-RELEASE <p11 \|\| >=14.4-RELEASE <p7 \|\| >=14.3-RELEASE <p16	p1, p11, p7, p16

Recommended response

Check inventory. Check lockfiles and deployed manifests for FreeBSD/FreeBSD.
Review the reported fix. Update FreeBSD/FreeBSD to p1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 19, 2026

Sources and claim methodology

Source referencesecurity.freebsd.org

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.