CVE-2026-6386

mediumpriority · track · 0EPSS 0.002 · 10 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.20% (10th) EPSS

CVSS 6.2 · medium

Is it mine?

16 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-27

In order to apply a particular protection key to an address range, the kernel must update the corresponding page table entries. The subroutine which handled this failed to take into account the presence of 1GB largepage mappings created using the shm_create_largepage(3) interface. In particular, it would always treat a page directory page entry as pointing to another page table page. The bug can be abused by an unprivileged user to cause pmap_pkru_update_range() to treat userspace memory as a page table page, and thus overwrite memory to which the application would otherwise not have access.

cvss

Technical severity, 0–10. One row per scoring source.

6.2

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.16.2mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · ENISA EU

v3.16.2mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondaryexploitability 2.5 · impact 3.6

v3.15.7mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-269USCWE-732US

affected products (16)

Products and version ranges known to be affected.

FreeBSD Project FreeBSD OS <13.5all versionscert_bundDE
FreeBSD Project FreeBSD OS <14.3all versionscert_bundDE
FreeBSD Project FreeBSD OS <14.4all versionscert_bundDE
FreeBSD Project FreeBSD OS <15.0all versionscert_bundDE
FreeBSD Project FreeBSD OS< 13.5cert_bundDE
FreeBSD Project FreeBSD OS< 14.3cert_bundDE
FreeBSD Project FreeBSD OS< 14.4cert_bundDE
FreeBSD Project FreeBSD OS< 15.0cert_bundDE
FreeBSD FreeBSD13.5-RELEASE → p12enisa_euvdEU
FreeBSD FreeBSD14.3-RELEASE → p11enisa_euvdEU
FreeBSD FreeBSD14.4-RELEASE → p2enisa_euvdEU
FreeBSD FreeBSD15.0-RELEASE → p6enisa_euvdEU
freebsd freebsd= 13.5nvdUScpe:2.3:o:freebsd:freebsd:*:*:*:*:*:*:*:*
freebsd freebsd= 14.3nvdUScpe:2.3:o:freebsd:freebsd:*:*:*:*:*:*:*:*
freebsd freebsd= 14.4nvdUScpe:2.3:o:freebsd:freebsd:*:*:*:*:*:*:*:*
freebsd freebsd= 15.0nvdUScpe:2.3:o:freebsd:freebsd:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-1218FreeBSD Project FreeBSD OS: Mehrere SchwachstellenDeutsch2026-04-21csaf · cert_bundDE
Ein lokaler Angreifer kann mehrere Schwachstellen in FreeBSD Project FreeBSD OS ausnutzen, um Administratorrechte zu erlangen oder Daten zu manipulieren.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd NVD CVE.org MITRE

published 2026-04-22modified 2026-06-17

references (4)

External citations — patches, advisories, analysis.

scry

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