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  4. CVE 2026 58094 toctou race in posix shared memory large page
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Back to active CVEs
High · CVSS 7.8CVE-2026-58094

TOCTOU race in POSIX shared memory large page configurationCVE-2026-58094

Answer in brief

CVE-2026-58094 records a High severity (CVSS 7.8) vulnerability in TOCTOU race in POSIX shared memory large page configuration. 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 26, 2026Updated Sep 24, 2026Source checked Oct 10, 2026First seen by HOL Aug 26, 2026Material review Sep 24, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.8
Exploitation
Not marked as known exploited
Affected software
23 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.8. 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:14.4: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:p7:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.4:p8:*:*:*:*:*:*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:p11:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.0:p12:*:*:*:*:*:*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:p1:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.1:p2:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
FreeBSD/FreeBSDgeneric>=15.1-RELEASE <p3 || >=15.0-RELEASE <p13 || >=14.4-RELEASE <p9p3, p13, p9

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for FreeBSD/FreeBSD.
  2. 2Review the reported fix. Update FreeBSD/FreeBSD to p3 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Aug 26, 2026

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

  2. Source modified

    Sep 24, 2026

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

  3. First seen by HOL

    Aug 26, 2026

Sources and claim methodology

  • Source referencesecurity.freebsd.org
Upstream source description

The FIOSSHMLPGCNF ioctl(2) operation configures the page size for a largepage shared memory object. This is intended to be used immediately after creating the object, before any memory is allocated for the object. The handler checked whether a page size had already been configured without holding the rangelock. Two concurrent callers could both observe an unconfigured object and set conflicting page sizes, leaving the object in an inconsistent state. An unprivileged local user can exploit this race 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-367
Source
CVE List V5
Source checked
Oct 10, 2026
References
1 linked source
Open source record