{
  "cveId": "CVE-2026-74619",
  "url": "https://patchblox.com/security/cve/CVE-2026-74619",
  "summary": "CVE-2026-74619 is fixed in 74 products on 1 platform, first by DEBIAN-CVE-2026-74619, released August 27, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "ovl: don\u0027t warn when the mount is completed from another user namespace",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ovl: don\u0027t warn when the mount is completed from another user namespace  fsopen() records the caller\u0027s user namespace in fc-\u003Euser_ns and hands back an ordinary file descriptor. Nothing ties the task that calls fsconfig(FSCONFIG_CMD_CREATE) to the task that created the context. The fd is inherited across fork() and exec() and it can be passed over a unix socket.  Completing a context from another user namespace is allowed on purpose. vfs_cmd_create() authorizes the create with mount_capable(), which for FS_USERNS_MOUNT checks ns_capable(fc-\u003Euser_ns, CAP_SYS_ADMIN), and that succeeds for a task holding CAP_SYS_ADMIN in an ancestor of fc-\u003Euser_ns. So an unprivileged task can reach the WARN_ON() in ovl_fill_super(): create a user and a mount namespace in a child, call fsopen(\u0022overlay\u0022) there, send the fscontext fd to the parent and let the parent issue FSCONFIG_CMD_CREATE. Both namespaces come from a plain unshare(1) and no capability is needed anywhere:    WARNING: fs/overlayfs/super.c:1551 at ovl_fill_super\u002B0x7b9/0x1e20 [overlay]   CPU: 3 UID: 1000 PID: 3243376 Comm: fswarn   Call Trace:    get_tree_nodev\u002B0x71/0xa0    ovl_get_tree\u002B0x15/0x20 [overlay]    vfs_get_tree\u002B0x2a/0x100    vfs_cmd_create\u002B0x60/0xf0    __do_sys_fsconfig\u002B0x4b2/0x500  The child needs the mount namespace because fsopen() itself gates on may_mount(), which asks for CAP_SYS_ADMIN in the user namespace owning the caller\u0027s mount namespace. fsconfig() doesn\u0027t repeat that check.  It is a WARN_ON() and not a WARN_ON_ONCE(), so the condition can be raised in a loop to taint the kernel and flood the log, and it panics a kernel booted with panic_on_warn.  Keep refusing the mount and stop warning about it. ovl_parse_param() already spells a user namespace check this way for Opt_override_creds.",
  "published": "2026-08-22T16:16:34Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "epss": 0.00168,
  "epssPercentile": 0.06108,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74619",
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    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}