{
  "cveId": "CVE-2026-78408",
  "url": "https://patchblox.com/security/cve/CVE-2026-78408",
  "summary": "CVE-2026-78408 is fixed in 16 products on 1 platform, first by RHSA-2026:93461, released September 2, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Util-linux: util-linux: nsenter --join-cgroup leaks root cgroup migration authority",
  "description": "The nsenter --join-cgroup option opens the target cgroup.procs file as root and leaves that file descriptor open across later namespace and credential changes and across execve(). Because the kernel checks later cgroup migrations using the credentials from the original open, a program run in an attacker-controlled target can inherit root\u0027s ability to move host processes between cgroups. After a privileged operator uses --join-cgroup against that target, an unprivileged user can migrate and terminate unrelated root processes.",
  "published": "2026-09-02T00:00:00Z",
  "severity": "Important",
  "cvss": 8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H",
  "cwe": "Missing Release of File Descriptor or Handle after Effective Lifetime",
  "epss": 0.00237,
  "epssPercentile": 0.14813,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78408",
  "fixes": [
    {
      "platform": "linux",
      "product": "libblkid",
      "release": "almalinux 10",
      "fixedVersion": "2.40.2-18.el10_2.20",
      "fix": "ALSA-2026:93461",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-93461",
      "released": "2026-11-07T00:39:57Z"
    },
    {
      "platform": "linux",
      "product": "libblkid",
      "release": "ol 10",
      "fixedVersion": "0:2.40.2-18.0.1.el10_2.20",
      "fix": "ELSA-2026-93461",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-93461",
      "released": "2026-11-07T00:59:15Z"
    },
    {
      "platform": "linux",
      "product": "libblkid-devel",
      "release": "almalinux 10",
      "fixedVersion": "2.40.2-18.el10_2.20",
      "fix": "ALSA-2026:93461",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-93461",
      "released": "2026-11-07T00:39:57Z"
    },
    {
      "platform": "linux",
      "product": "libblkid-devel",
      "release": "ol 10",
      "fixedVersion": "0:2.40.2-18.0.1.el10_2.20",
      "fix": "ELSA-2026-93461",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-93461",
      "released": "2026-11-07T00:59:15Z"
    },
    {
      "platform": "linux",
      "product": "libfdisk",
      "release": "almalinux 10",
      "fixedVersion": "2.40.2-18.el10_2.20",
      "fix": "ALSA-2026:93461",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-93461",
      "released": "2026-11-07T00:39:57Z"
    },
    {
      "platform": "linux",
      "product": "libfdisk",
      "release": "ol 10",
      "fixedVersion": "0:2.40.2-18.0.1.el10_2.20",
      "fix": "ELSA-2026-93461",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-93461",
      "released": "2026-11-07T00:59:15Z"
    },
    {
      "platform": "linux",
      "product": "libfdisk-devel",
      "release": "almalinux 10",
      "fixedVersion": "2.40.2-18.el10_2.20",
      "fix": "ALSA-2026:93461",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-93461",
      "released": "2026-11-07T00:39:57Z"
    },
    {
      "platform": "linux",
      "product": "libfdisk-devel",
      "release": "ol 10",
      "fixedVersion": "0:2.40.2-18.0.1.el10_2.20",
      "fix": "ELSA-2026-93461",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-93461",
      "released": "2026-11-07T00:59:15Z"
    },
    {
      "platform": "linux",
      "product": "libmount",
      "release": "almalinux 10",
      "fixedVersion": "2.40.2-18.el10_2.20",
      "fix": "ALSA-2026:93461",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-93461",
      "released": "2026-11-07T00:39:57Z"
    },
    {
      "platform": "linux",
      "product": "libmount",
      "release": "ol 10",
      "fixedVersion": "0:2.40.2-18.0.1.el10_2.20",
      "fix": "ELSA-2026-93461",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-93461",
      "released": "2026-11-07T00:59:15Z"
    },
    {
      "platform": "linux",
      "product": "libmount-devel",
      "release": "almalinux 10",
      "fixedVersion": "2.40.2-18.el10_2.20",
      "fix": "ALSA-2026:93461",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-93461",
      "released": "2026-11-07T00:39:57Z"
    },
    {
      "platform": "linux",
      "product": "libmount-devel",
      "release": "ol 10",
      "fixedVersion": "0:2.40.2-18.0.1.el10_2.20",
      "fix": "ELSA-2026-93461",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-93461",
      "released": "2026-11-07T00:59:15Z"
    },
    {
      "platform": "linux",
      "product": "libsmartcols",
      "release": "almalinux 10",
      "fixedVersion": "2.40.2-18.el10_2.20",
      "fix": "ALSA-2026:93461",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-93461",
      "released": "2026-11-07T00:39:57Z"
    },
    {
      "platform": "linux",
      "product": "libsmartcols",
      "release": "ol 10",
      "fixedVersion": "0:2.40.2-18.0.1.el10_2.20",
      "fix": "ELSA-2026-93461",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-93461",
      "released": "2026-11-07T00:59:15Z"
    },
    {
      "platform": "linux",
      "product": "libsmartcols-devel",
      "release": "almalinux 10",
      "fixedVersion": "2.40.2-18.el10_2.20",
      "fix": "ALSA-2026:93461",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-93461",
      "released": "2026-11-07T00:39:57Z"
    },
    {
      "platform": "linux",
      "product": "libsmartcols-devel",
      "release": "ol 10",
      "fixedVersion": "0:2.40.2-18.0.1.el10_2.20",
      "fix": "ELSA-2026-93461",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-93461",
      "released": "2026-11-07T00:59:15Z"
    },
    {
      "platform": "linux",
      "product": "libuuid",
      "release": "almalinux 10",
      "fixedVersion": "2.40.2-18.el10_2.20",
      "fix": "ALSA-2026:93461",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-93461",
      "released": "2026-11-07T00:39:57Z"
    },
    {
      "platform": "linux",
      "product": "libuuid",
      "release": "ol 10",
      "fixedVersion": "0:2.40.2-18.0.1.el10_2.20",
      "fix": "ELSA-2026-93461",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-93461",
      "released": "2026-11-07T00:59:15Z"
    },
    {
      "platform": "linux",
      "product": "libuuid-devel",
      "release": "almalinux 10",
      "fixedVersion": "2.40.2-18.el10_2.20",
      "fix": "ALSA-2026:93461",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-93461",
      "released": "2026-11-07T00:39:57Z"
    },
    {
      "platform": "linux",
      "product": "libuuid-devel",
      "release": "ol 10",
      "fixedVersion": "0:2.40.2-18.0.1.el10_2.20",
      "fix": "ELSA-2026-93461",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-93461",
      "released": "2026-11-07T00:59:15Z"
    },
    {
      "platform": "linux",
      "product": "python-libmount",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "2.41.1-160000.5.1",
      "fix": "OPENSUSE-SU-2026:21905-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21905-1",
      "released": "2026-09-22T07:23:43Z"
    },
    {
      "platform": "linux",
      "product": "python-libmount",
      "release": "sles 16.0",
      "fixedVersion": "2.41.1-160000.5.1",
      "fix": "SUSE-SU-2026:23870-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23870-1",
      "released": "2026-09-22T07:23:33Z"
    },
    {
      "platform": "linux",
      "product": "python3-libmount",
      "release": "almalinux 10",
      "fixedVersion": "2.40.2-18.el10_2.20",
      "fix": "ALSA-2026:93461",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-93461",
      "released": "2026-11-07T00:39:57Z"
    },
    {
      "platform": "linux",
      "product": "python3-libmount",
      "release": "ol 10",
      "fixedVersion": "0:2.40.2-18.0.1.el10_2.20",
      "fix": "ELSA-2026-93461",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-93461",
      "released": "2026-11-07T00:59:15Z"
    },
    {
      "platform": "linux",
      "product": "util-linux",
      "release": "Debian 14",
      "fixedVersion": "2.42.4-1",
      "fix": "DEBIAN-CVE-2026-78408",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-78408",
      "released": "2026-09-17T18:08:56Z"
    },
    {
      "platform": "linux",
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    {
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      "fix": "ALSA-2026:93461",
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      "released": "2026-11-07T00:39:57Z"
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      "fix": "ELSA-2026-93461",
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      "released": "2026-11-07T00:59:15Z"
    },
    {
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      "fix": "OPENSUSE-SU-2026:21905-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21905-1",
      "released": "2026-09-22T07:23:43Z"
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    {
      "platform": "linux",
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      "release": "rocky 10",
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      "url": "https://patchblox.com/security/fix/linux/rlsa-2026-93461",
      "released": "2026-11-07T00:39:51Z"
    },
    {
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      "fixedVersion": "2.41.1-160000.5.1",
      "fix": "SUSE-SU-2026:23870-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23870-1",
      "released": "2026-09-22T07:23:33Z"
    },
    {
      "platform": "linux",
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      "release": "almalinux 10",
      "fixedVersion": "2.40.2-18.el10_2.20",
      "fix": "ALSA-2026:93461",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-93461",
      "released": "2026-11-07T00:39:57Z"
    },
    {
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      "release": "ol 10",
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      "fix": "ELSA-2026-93461",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-93461",
      "released": "2026-11-07T00:59:15Z"
    },
    {
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      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21905-1",
      "released": "2026-09-22T07:23:43Z"
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      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23870-1",
      "released": "2026-09-22T07:23:33Z"
    },
    {
      "platform": "linux",
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      "url": "https://patchblox.com/security/fix/linux/alsa-2026-93461",
      "released": "2026-11-07T00:39:57Z"
    },
    {
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      "url": "https://patchblox.com/security/fix/linux/elsa-2026-93461",
      "released": "2026-11-07T00:59:15Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}