CVE-2026-101304: FreeBSD · Improper Check for Dropped Privileges
Affects FreeBSDSource CVE Database V5
Not known to be exploited · CVSS 7.1 High · fixed in p14 : patch FreeBSD soon.
Data as of 26 Oct 2026, 22:21 UTC
- 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:NExploitation evidence
Disclosed: evidence found.
CVE published 15 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| FreeBSDFreeBSD | Affected
| Fixed in
|
| FreeBSDFreeBSD | Affected
| Fixed in
|
| FreeBSDFreeBSD | Affected
| Fixed in
|
| FreeBSDFreeBSD | Affected
| Fixed in
|
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.