GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

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

Vulnerability from cvelistv5 – Published: 2025-10-01 11:46 – Updated: 2026-05-23 15:29
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a196c78b5443fc61af2c0490213b9d125482cbd1 , < 75a499fc9d66a32271e2b3e4ca71156e8ad3b484 (git)
Affected: a196c78b5443fc61af2c0490213b9d125482cbd1 , < 10fb2e16ee6ffaf1716b9e90d007e6b300bfa457 (git)
Affected: a196c78b5443fc61af2c0490213b9d125482cbd1 , < 54aa7f2330b82884f4a1afce0220add6e8312f8b (git)
Affected: cef27a7d36026bd3c86f4fdfb4611ebbe2814af4 (git)
Affected: 5.17.9 , < 5.18 (semver)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "io_uring/io_uring.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "75a499fc9d66a32271e2b3e4ca71156e8ad3b484",
              "status": "affected",
              "version": "a196c78b5443fc61af2c0490213b9d125482cbd1",
              "versionType": "git"
            },
            {
              "lessThan": "10fb2e16ee6ffaf1716b9e90d007e6b300bfa457",
              "status": "affected",
              "version": "a196c78b5443fc61af2c0490213b9d125482cbd1",
              "versionType": "git"
            },
            {
              "lessThan": "54aa7f2330b82884f4a1afce0220add6e8312f8b",
              "status": "affected",
              "version": "a196c78b5443fc61af2c0490213b9d125482cbd1",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "cef27a7d36026bd3c86f4fdfb4611ebbe2814af4",
              "versionType": "git"
            },
            {
              "lessThan": "5.18",
              "status": "affected",
              "version": "5.17.9",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "io_uring/io_uring.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.18"
            },
            {
              "lessThan": "5.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.2.*",
              "status": "unaffected",
              "version": "6.2.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.16",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2.3",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.3",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.17.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-23T15:29:17.822Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/75a499fc9d66a32271e2b3e4ca71156e8ad3b484"
        },
        {
          "url": "https://git.kernel.org/stable/c/10fb2e16ee6ffaf1716b9e90d007e6b300bfa457"
        },
        {
          "url": "https://git.kernel.org/stable/c/54aa7f2330b82884f4a1afce0220add6e8312f8b"
        }
      ],
      "title": "io_uring: fix fget leak when fs don\u0027t support nowait buffered read",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53511",
    "datePublished": "2025-10-01T11:46:00.185Z",
    "dateReserved": "2025-10-01T11:39:39.406Z",
    "dateUpdated": "2026-05-23T15:29:17.822Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2023-53511",
      "date": "2026-09-14",
      "epss": "0.00143",
      "percentile": "0.03956"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53511\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-01T12:15:55.030\",\"lastModified\":\"2026-06-17T06:45:30.170\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"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\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"io_uring/io_uring.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"a196c78b5443fc61af2c0490213b9d125482cbd1\",\"lessThan\":\"75a499fc9d66a32271e2b3e4ca71156e8ad3b484\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a196c78b5443fc61af2c0490213b9d125482cbd1\",\"lessThan\":\"10fb2e16ee6ffaf1716b9e90d007e6b300bfa457\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a196c78b5443fc61af2c0490213b9d125482cbd1\",\"lessThan\":\"54aa7f2330b82884f4a1afce0220add6e8312f8b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cef27a7d36026bd3c86f4fdfb4611ebbe2814af4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.17.9\",\"lessThan\":\"5.18\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"io_uring/io_uring.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.16\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.2.3\",\"lessThanOrEqual\":\"6.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.3\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-401\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.17.9\",\"versionEndExcluding\":\"5.18\",\"matchCriteriaId\":\"237FF665-63EB-4FB8-B2DC-5BD5D79B8053\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.18.1\",\"versionEndExcluding\":\"6.1.16\",\"matchCriteriaId\":\"2EF76361-0A42-48AE-BC0D-99DAB44B5118\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.2.3\",\"matchCriteriaId\":\"88C67289-22AD-4CA9-B202-5F5A80E5BA4B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.18:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"0384FA0A-DE99-48D7-84E3-46ED0C3B5E03\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.18:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"EE723F14-047B-4FCF-B109-E0542EDFB063\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.18:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"2FCFCE58-5118-4D05-864E-C82CF20EABE5\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/10fb2e16ee6ffaf1716b9e90d007e6b300bfa457\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/54aa7f2330b82884f4a1afce0220add6e8312f8b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/75a499fc9d66a32271e2b3e4ca71156e8ad3b484\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-21T19:12:36+00:00",
      "cve": "CVE-2023-53511",
      "id": "CVE-2023-53511",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_affected": "108",
      "product_status:known_not_affected": "166",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Denial of Service due to file descriptor leak in io_uring with ocfs2",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53511.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.