CVE-2023-53511 (GCVE-0-2023-53511)

Vulnerability from cvelistv5 – Published: 2025-10-01 11:46 – Updated: 2025-10-01 11:46
VLAI?
Title
io_uring: fix fget leak when fs don't support nowait buffered read
Summary
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
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a196c78b5443fc61af2c0490213b9d125482cbd1 , < 75a499fc9d66a32271e2b3e4ca71156e8ad3b484 (git)
Affected: a196c78b5443fc61af2c0490213b9d125482cbd1 , < 10fb2e16ee6ffaf1716b9e90d007e6b300bfa457 (git)
Affected: a196c78b5443fc61af2c0490213b9d125482cbd1 , < 54aa7f2330b82884f4a1afce0220add6e8312f8b (git)
Affected: cef27a7d36026bd3c86f4fdfb4611ebbe2814af4 (git)
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    Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (semver)
Unaffected: 6.1.16 , ≤ 6.1.* (semver)
Unaffected: 6.2.3 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: fix fget leak when fs don\u0027t support nowait buffered read\n\nHeming reported a BUG when using io_uring doing link-cp on ocfs2. [1]\n\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\n\nThen umount will fail, and it outputs:\numount: /mnt/ocfs2: target is busy.\n\nWhile tracing umount, it blames mnt_get_count() not return as expected.\nDo a deep investigation for fget()/fput() on related code flow, I\u0027ve\nfinally found that fget() leaks since ocfs2 doesn\u0027t support nowait\nbuffered read.\n\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-\u003efile, leak happens\n\nThis was introduced by commit a196c78b5443 in v5.18. Fix it by don\u0027t\nre-assign req-\u003efile if it has already been assigned.\n\n[1] https://lore.kernel.org/ocfs2-devel/ab580a75-91c8-d68a-3455-40361be1bfa8@linux.alibaba.com/T/#t"
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        "dateUpdated": "2025-10-01T11:46:00.185Z",
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    "datePublished": "2025-10-01T11:46:00.185Z",
    "dateReserved": "2025-10-01T11:39:39.406Z",
    "dateUpdated": "2025-10-01T11:46:00.185Z",
    "state": "PUBLISHED"
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