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VulnerabilityPublished Updated

CVE-2026-101304: FreeBSD · Improper Check for Dropped Privileges

Affects FreeBSDSource CVE Database V5

0

Not known to be exploited · CVSS 7.1 High · fixed in p14 : patch FreeBSD soon.

Data as of 26 Oct 2026, 22:21 UTC

CVSS 3.1 base score
7.1High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 3% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CISA SSVC
Exploitation
No evidence of active exploitation and no public proof of concept
Automatable
Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact
Total control over the software or total information disclosure

CISA SSVC assessment, 2026-10-20.

Patch
Available – fixed in p14, p10, p4 +1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 15 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade FreeBSD to p14, p10, p4 or p1.

Affected software

ProductAffectedFixed in
FreeBSDFreeBSDAffected
  • >=15.0-RELEASE <p14
Fixed in
  • p14
FreeBSDFreeBSDAffected
  • >=14.4-RELEASE <p10
Fixed in
  • p10
FreeBSDFreeBSDAffected
  • >=15.1-RELEASE <p4
Fixed in
  • p4
FreeBSDFreeBSDAffected
  • >=14.5-RELEASE <p1
Fixed in
  • p1

AI-suggested

This vulnerability has been fixed in FreeBSD patch versions p14, p10, p4, and p1 for the affected releases. Users should apply these official patches to remediate the issue. No additional mitigation steps are indicated beyond applying the provided fixes.

Description

CVE-2026-101304 is a vulnerability in FreeBSD where mounting fdescfs(4) in a jail with the "nodup" option causes file descriptors opened via /dev/fd/N to not inherit certain security restrictions. This allows a process in a jail to potentially escape the jail's filesystem root restriction by using a directory file descriptor received from another jail.

References

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