{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53341",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-53341"
  ],
  "published": "2026-07-01T13:34:53Z",
  "summary": "fhandle: fix UAF due to unlocked ->mnt_ns read in may_decode_fh()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfhandle: fix UAF due to unlocked ->mnt_ns read in may_decode_fh()\n\nmay_decode_fh() accesses mount::mnt_ns without holding any locks; that\nmeans the mount can concurrently be unmounted, and the mnt_namespace can\nconcurrently be freed after an RCU grace period.\n\nThis race can happens as follows, assuming that the mount point was\ncreated by open_tree(..., OPEN_TREE_CLONE):\n\nthread 1            thread 2            RCU\n                    __do_sys_open_by_handle_at\n                      do_handle_open\n                        handle_to_path\n                          may_decode_fh\n                            is_mounted\n                              [mount::mnt_ns access]\n                            [mount::mnt_ns access]\n__do_sys_close\n  fput_close_sync\n    __fput\n      dissolve_on_fput\n        umount_tree\n        class_namespace_excl_destructor\n          namespace_unlock\n            free_mnt_ns\n              mnt_ns_tree_remove\n                call_rcu(mnt_ns_release_rcu)\n                                        mnt_ns_release_rcu\n                                          mnt_ns_release\n                                            kfree\n                            [mnt_namespace::user_ns access] **UAF**\n\nFix it by taking rcu_read_lock() around the mount::mnt_ns access, like\nin __prepend_path().\nAdditionally, document the semantics of mount::mnt_ns, and use WRITE_ONCE()\nfor writers that can race with lockless readers.\n\nThis bug is unreachable unless one of the following is set:\n\n - CONFIG_PREEMPTION\n - CONFIG_RCU_STRICT_GRACE_PERIOD\n\nbecause it requires an RCU grace period to happen during a syscall without\nan explicit preemption.\n\nThis doesn't seem to have interesting security impact; worst-case, it could\nleak the result of an integer comparison to userspace (from the level\ncheck in cap_capable()), cause an endless loop, or crash the kernel by\ndereferencing an invalid address.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-53341"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/15ea8dc42a02259d49dee38a658d40f60fcd75ed"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/32138633e51e6db59e474765cf93268c92b42888"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a8ed2c29fcfdac78db96c9da4e659c8a513f2a94"
    },
    {
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      "url": "https://git.kernel.org/stable/c/40ab6644b99685755f740b872c00ef40d9aa870e"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable code is reached through local syscalls, primarily `open_by_handle_at()` racing with close/fput of a mount file created by `open_tree(..., OPEN_TREE_CLONE)`. There is no network or adjacent attack path.\nAC:L - The attacker can control both sides of the race by running concurrent local threads that call `open_by_handle_at()` and close the cloned mount file. Although the bug requires preemption or strict RCU grace periods, those are reasonable kernel configurations and the race is attacker-driven.\nPR:L - The path requires namespace-relative capabilities such as `CAP_SYS_ADMIN` and `CAP_DAC_READ_SEARCH`, which an unprivileged local user can obtain inside a user namespace on systems where unprivileged user namespaces are enabled. It does not require real init-namespace root.\nUI:N - No victim action is required; the attacker directly invokes the relevant syscalls and controls the racing threads. The mount clone, handle input, and close operation are all attacker initiated.\nS:U - The vulnerability affects kernel VFS/mount namespace state within the same security authority. It is a local kernel memory-safety issue, not a VM escape or cross-scope boundary bypass.\nC:H - The bug is a kernel use-after-free of `struct mnt_namespace`, followed by dereferencing reclaimed memory through `mnt_ns->user_ns` and capability-walk fields. Per the higher-severity rule for kernel UAFs, this is scored as high confidentiality impact.\nI:H - The immediate operation is a stale read in an authorization check, but reclaimed kernel heap contents can influence capability-check control flow and UAFs are treated as potentially exploitable memory corruption. Under the required uncertainty rule, integrity impact is high.\nA:H - The stale `mnt_namespace` dereference can crash the kernel, loop indefinitely, or otherwise destabilize the system. A local attacker can repeatedly trigger the race, so availability impact is high."
    }
  }
}