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CVE-2026-101306 is a filesystem-isolation bypass in FreeBSD jails involving SCM_RIGHTS file-descriptor passing. FD_RESOLVE_BENEATH restrictions are not preserved when a directory file descriptor is transferred over a Unix domain socket. A process can send such a descriptor to itself and clear the restriction, enabling a jailed process holding a directory descriptor received from another jail to bypass the jail filesystem root.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
pkg upgrade -r FreeBSD-base; for binary distribution-set installations, run freebsd-update fetch followed by freebsd-update install. Alternatively, apply the verified source patch, rebuild the kernel, and reboot.No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
1 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.