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  4. CVE 2026 49428 posixshm system calls can incorrectly free memory
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Back to active CVEs
High · CVSS 8.4CVE-2026-49428

posixshm: system calls can incorrectly free memory of largepage objects

Answer in brief

CVE-2026-49428 records a High severity (CVSS 8.4) 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 Sep 1, 2026Source checked Oct 3, 2026First seen by HOL Aug 19, 2026Material review Sep 1, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.4
Exploitation
Not marked as known exploited
Affected software
39 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 8.4. 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.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:o:freebsd:freebsd:14.3:-:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.3:p1:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.3:p10:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.3:p11:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.3:p12:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.3:p13:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.3:p14:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.3:p15:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.3:p2:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.3:p3:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.3:p4:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.3:p5:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.3:p6:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.3:p7:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.3:p8:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.3:p9:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.4:-:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.4:p1:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.4:p2:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.4:p3:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.4:p4:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.4:p5:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.4:p6:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.4:rc1:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.0:-:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.0:p1:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.0:p10:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.0:p2:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.0:p3:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.0:p4:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.0:p5:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.0:p6:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.0:p7:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.0:p8:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.0:p9:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.1:-:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.1:rc2:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.1:rc3-p1:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
FreeBSD/FreeBSDgeneric>=15.1-RELEASE <p1 || >=15.0-RELEASE <p11 || >=14.4-RELEASE <p7 || >=14.3-RELEASE <p16p1, p11, p7, p16

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for FreeBSD/FreeBSD.
  2. 2Review 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

  1. Published upstream

    Aug 19, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 1, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. 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.

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Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-915
Source
CVE List V5
Source checked
Oct 3, 2026
References
1 linked source
Open source record