{
  "threat_severity" : "Low",
  "public_date" : "2025-10-01T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: Linux kernel: Denial of Service due to file descriptor leak in io_uring with ocfs2",
    "id" : "2400770",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2400770"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.5",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-772",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nio_uring: fix fget leak when fs don't support nowait buffered read\nHeming reported a BUG when using io_uring doing link-cp on ocfs2. [1]\nDo the following steps can reproduce this BUG:\nmount -t ocfs2 /dev/vdc /mnt/ocfs2\ncp testfile /mnt/ocfs2/\n./link-cp /mnt/ocfs2/testfile /mnt/ocfs2/testfile.1\numount /mnt/ocfs2\nThen umount will fail, and it outputs:\numount: /mnt/ocfs2: target is busy.\nWhile tracing umount, it blames mnt_get_count() not return as expected.\nDo a deep investigation for fget()/fput() on related code flow, I've\nfinally found that fget() leaks since ocfs2 doesn't support nowait\nbuffered read.\nio_issue_sqe\n|-io_assign_file  // do fget() first\n|-io_read\n|-io_iter_do_read\n|-ocfs2_file_read_iter  // return -EOPNOTSUPP\n|-kiocb_done\n|-io_rw_done\n|-__io_complete_rw_common  // set REQ_F_REISSUE\n|-io_resubmit_prep\n|-io_req_prep_async  // override req->file, leak happens\nThis was introduced by commit a196c78b5443 in v5.18. Fix it by don't\nre-assign req->file if it has already been assigned.\n[1] https://lore.kernel.org/ocfs2-devel/ab580a75-91c8-d68a-3455-40361be1bfa8@linux.alibaba.com/T/#t", "A flaw was found in the Linux kernel. A local user can exploit a file descriptor leak in the `io_uring` subsystem when performing operations on filesystems that do not support nowait buffered read, such as `ocfs2`. This vulnerability occurs because a file descriptor (fget) is acquired but not properly released (fput), leading to a resource leak. The most important consequence is a Denial of Service (DoS), which can prevent the unmounting of affected filesystems." ],
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2023-11-07T00:00:00Z",
    "advisory" : "RHSA-2023:6583",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-362.8.1.el9_3"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2023-11-07T00:00:00Z",
    "advisory" : "RHSA-2023:6583",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-362.8.1.el9_3"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2023-53511\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-53511\nhttps://lore.kernel.org/linux-cve-announce/2025100130-CVE-2023-53511-99e8@gregkh/T" ],
  "name" : "CVE-2023-53511",
  "csaw" : false
}