How severe is CVE-2025-15547?

CVE-2025-15547 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-15547 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-15547?

CVE-2025-15547 primarily affects Freebsd. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-15547?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-15547 have an EU (EUVD) identifier?

Yes. CVE-2025-15547 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-208407.

When was CVE-2025-15547 published?

CVE-2025-15547 was published on 2026-03-09 and last updated on 2026-06-17.

CVE-2025-15547

CVE-2025-15547 is a high-severity vulnerability in Freebsd with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-269.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-208407
Weakness: CWE-269
Affected product: Freebsd
Published: 2026-03-09
Last modified: 2026-06-17

Description

By default, jailed processes cannot mount filesystems, including nullfs(4). However, the allow.mount.nullfs option enables mounting nullfs filesystems, subject to privilege checks. If a privileged user within a jail is able to nullfs-mount directories, a limitation of the kernel's path lookup logic allows that user to escape the jail's chroot, yielding access to the full filesystem of the host or parent jail. In a jail configured to allow nullfs(4) mounts from within the jail, the jailed root user can escape the jail's filesystem root.

Frequently asked questions

What is CVE-2025-15547?: By default, jailed processes cannot mount filesystems, including nullfs(4). However, the allow.mount.nullfs option enables mounting nullfs filesystems, subject to privilege checks. If a privileged user within a jail is able to nullfs-mount directories, a limitation of the kernel's path lookup logic allows that user to escape the jail's chroot, yielding access to the full filesystem of the host or parent jail. In a jail configured to allow nullfs(4) mounts from within the jail, the jailed root user can escape the jail's filesystem root.
How severe is CVE-2025-15547?: CVE-2025-15547 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-15547 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-15547?: CVE-2025-15547 primarily affects Freebsd. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-15547?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-15547 have an EU (EUVD) identifier?: Yes. CVE-2025-15547 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-208407.
When was CVE-2025-15547 published?: CVE-2025-15547 was published on 2026-03-09 and last updated on 2026-06-17.

References

https://security.freebsd.org/advisories/FreeBSD-SA-26:02.jail.asc

Affected products (17)

cpe:2.3:o:freebsd:freebsd:13.5:-:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:13.5:p1:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:13.5:p2:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:13.5:p3:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:13.5:p4:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:13.5:p5:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:13.5:p6:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:13.5:p7:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:13.5:p8:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:14.3:-:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:14.3:p1:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:14.3:p2:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:14.3:p3:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:14.3:p4:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:14.3:p5:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:14.3:p6:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:14.3:p7:*:*:*:*:*:*

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