CVE-2023-53511

MEDIUM EPSS 3.2%
Published Oct 1, 20259mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Oct 1, 2025 9mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: io_uring: fix fget leak when fs don't support nowait buffered read Heming reported a BUG when using io_uring doing link-cp on ocfs2. [1] Do the following steps can reproduce this BUG: mount -t ocfs2 /dev/vdc /mnt/ocfs2 cp testfile /mnt/ocfs2/ ./link-cp /mnt/ocfs2/testfile /mnt/ocfs2/testfile.1 umount /mnt/ocfs2 Then umount will fail, and it outputs: umount: /mnt/ocfs2: target is busy. While tracing umount, it blames mnt_get_count() not return as expected. Do a deep investigation for fget()/fput() on related code flow, I've finally found that fget() leaks since ocfs2 doesn't support nowait buffered read. io_issue_sqe |-io_assign_file // do fget() first |-io_read |-io_iter_do_read |-ocfs2_file_read_iter // return -EOPNOTSUPP |-kiocb_done |-io_rw_done |-__io_complete_rw_common // set REQ_F_REISSUE |-io_resubmit_prep |-io_req_prep_async // override req->file, leak happens This was introduced by commit a196c78b5443 in v5.18. Fix it by don't re-assign req->file if it has already been assigned. [1] https://lore.kernel.org/ocfs2-devel/ab580a75-91c8-d68a-3455-40361be1bfa8@linux.alibaba.com/T/#t

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
3.2% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-401

Affected Products 6

VendorProductVersionRange
linuxlinux_kernel*≥5.17.9  –  <5.18
linuxlinux_kernel*≥5.18.1  –  <6.1.16
linuxlinux_kernel*≥6.2  –  <6.2.3
linuxlinux_kernel5.18any
linuxlinux_kernel5.18any
linuxlinux_kernel5.18any

References 3

  • git.kernel.org https://git.kernel.org/stable/c/10fb2e16ee6ffaf1716b9e90d007e6b300bfa457
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/54aa7f2330b82884f4a1afce0220add6e8312f8b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/75a499fc9d66a32271e2b3e4ca71156e8ad3b484
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/10fb2e16ee6ffaf1716b9e90d007e6b300bfa457
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/54aa7f2330b82884f4a1afce0220add6e8312f8b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/75a499fc9d66a32271e2b3e4ca71156e8ad3b484
    Patch