CVE-2026-101304
Full vulnerability record from the local CVENow database.
Description
When fdescfs(4) was mounted in a jail with the "nodup" option, opening /dev/fd/N returned a descriptor that did not inherit FD_RESOLVE_BENEATH or the Capsicum capability rights of descriptor N. A process in a jail that has received a directory file descriptor from another jail can use these techniques to escape the jail's filesystem root restriction.
Severity
HIGH
CVSS score
7.1
(v3.1)
Vulnerability status
Modified
Source identifier
Published
2026-10-15 07:17:57.550000
Last modified
2026-10-20 17:17:27.510000
View original CVE JSON
{
"id": "CVE-2026-101304",
"sourceIdentifier": "[email protected]",
"published": "2026-10-15T07:17:57.550",
"lastModified": "2026-10-20T17:17:27.510",
"vulnStatus": "Modified",
"cveTags": [],
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{
"lang": "en",
"value": "When fdescfs(4) was mounted in a jail with the \"nodup\" option, opening /dev/fd/N returned a descriptor that did not inherit FD_RESOLVE_BENEATH or the Capsicum capability rights of descriptor N.\n\nA process in a jail that has received a directory file descriptor from another jail can use these techniques to escape the jail's filesystem root restriction."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
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"product": "FreeBSD",
"defaultStatus": "unknown",
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"references": [
{
"url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:66.jail.asc",
"source": "[email protected]",
"tags": [
"Patch",
"Vendor Advisory"
]
}
]
}