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CVE-2023-52926 (GCVE-0-2023-52926)

Vulnerability from cvelistv5 – Published: 2025-02-24 09:01 – Updated: 2026-08-05 09:12
VLAI
Title
io_uring/rw: split io_read() into a helper
Summary
In the Linux kernel, the following vulnerability has been resolved: IORING_OP_READ did not correctly consume the provided buffer list when read i/o returned < 0 (except for -EAGAIN and -EIOCBQUEUED return). This can lead to a potential use-after-free when the completion via io_rw_done runs at separate context.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-25 16:27 UTC
CWE
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 2b188cc1bb857a9d4701ae59aa7768b5124e262e , < 72060434a14caea20925e492310d6e680e3f9007 (git)
Affected: 2b188cc1bb857a9d4701ae59aa7768b5124e262e , < 6c27fc6a783c8a77c756dd5461b15e465020d075 (git)
Affected: 2b188cc1bb857a9d4701ae59aa7768b5124e262e , < a08d195b586a217d76b42062f88f375a3eedda4d (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.1
Unaffected: 0 , < 5.1 (semver)
Unaffected: 6.1.122 , ≤ 6.1.* (semver)
Unaffected: 6.6.68 , ≤ 6.6.* (semver)
Unaffected: 6.7 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website

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                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.7",
                      "versionStartIncluding": "5.1",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nIORING_OP_READ did not correctly consume the provided buffer list when\nread i/o returned \u003c 0 (except for -EAGAIN and -EIOCBQUEUED return).\nThis can lead to a potential use-after-free when the completion via\nio_rw_done runs at separate context."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The bug is in io_uring IORING_OP_READ handling, reachable only via local syscalls (io_uring_setup/io_uring_enter), not via network packet processing.\nAC:L - An unprivileged attacker can reliably trigger the bad path by registering provided buffers and submitting IORING_OP_READ that fails with an error other than -EAGAIN/-EIOCBQUEUED; any race with async io_rw_done task-work is attacker-controlled.\nPR:L - io_uring is usable by unprivileged users by default (sysctl kernel.io_uring_disabled=0); no CAP_SYS_ADMIN or init-namespace root is required.\nUI:N - The attacker submits their own io_uring SQEs and provided buffers; no victim action is required.\nS:U - This is kernel memory corruption within the host kernel\u0027s authority (local privilege escalation), not a VM escape or IOMMU/security-boundary crossover.\nC:H - CVE documents a use-after-free on provided buffer list mishandling; UAF enables control of freed object contents and arbitrary kernel memory disclosure.\nI:H - Kernel UAF on provided buffers is exploitable for heap reuse and arbitrary write/control-flow hijacking, enabling privilege escalation.\nA:H - Use-after-free in io_uring completion can cause kernel oops/panic even when not fully exploited for code execution."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T09:12:04.609Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/72060434a14caea20925e492310d6e680e3f9007"
            },
            {
              "url": "https://git.kernel.org/stable/c/6c27fc6a783c8a77c756dd5461b15e465020d075"
            },
            {
              "url": "https://git.kernel.org/stable/c/a08d195b586a217d76b42062f88f375a3eedda4d"
            }
          ],
          "title": "io_uring/rw: split io_read() into a helper",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2023-52926",
        "datePublished": "2025-02-24T09:01:19.209Z",
        "dateReserved": "2024-08-21T06:07:11.018Z",
        "dateUpdated": "2026-08-05T09:12:04.609Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.

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Detection rules are retrieved from Rulezet.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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