CVE-2023-52983 (GCVE-0-2023-52983)

Vulnerability from cvelistv5 – Published: 2025-03-27 16:43 – Updated: 2026-08-05 09:12
VLAI
Title
block, bfq: fix uaf for bfqq in bic_set_bfqq()
Summary
In the Linux kernel, the following vulnerability has been resolved: block, bfq: fix uaf for bfqq in bic_set_bfqq() After commit 64dc8c732f5c ("block, bfq: fix possible uaf for 'bfqq->bic'"), bic->bfqq will be accessed in bic_set_bfqq(), however, in some context bic->bfqq will be freed, and bic_set_bfqq() is called with the freed bic->bfqq. Fix the problem by always freeing bfqq after bic_set_bfqq().
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-03-27 16:59 UTC
CWE
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6651 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5533742c7cb1bc9b1f0bf401cc397d44a3a9e07a , < 7f77f3dab5066a7c9da73d72d1eee895ff84a8d5 (git)
Affected: 094f3d9314d67691cb21ba091c1b528f6e3c4893 , < 511c922c5bf6c8a166bea826e702336bc2424140 (git)
Affected: 761564d93c8265f65543acf0a576b32d66bfa26a , < cb1876fc33af26d00efdd473311f1b664c77c44e (git)
Affected: 64dc8c732f5c2b406cc752e6aaa1bd5471159cab , < b600de2d7d3a16f9007fad1bdae82a3951a26af2 (git)
Affected: b22fd72bfebda3956efc4431b60ddfc0a51e03e0 (git)
Affected: 6.0.16 , < 6.1 (semver)
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Linux Linux Affected: 5.15.86 , < 5.15.93 (semver)
Affected: 6.1.2 , < 6.1.11 (semver)
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Show details on NVD website
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                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "block/bfq-cgroup.c",
                "block/bfq-iosched.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "5.15.93",
                  "status": "affected",
                  "version": "5.15.86",
                  "versionType": "semver"
                },
                {
                  "lessThan": "6.1.11",
                  "status": "affected",
                  "version": "6.1.2",
                  "versionType": "semver"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.93",
                      "versionStartIncluding": "5.15.86",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.11",
                      "versionStartIncluding": "6.1.2",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionStartIncluding": "6.0.16",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock, bfq: fix uaf for bfqq in bic_set_bfqq()\n\nAfter commit 64dc8c732f5c (\"block, bfq: fix possible uaf for \u0027bfqq-\u003ebic\u0027\"),\nbic-\u003ebfqq will be accessed in bic_set_bfqq(), however, in some context\nbic-\u003ebfqq will be freed, and bic_set_bfqq() is called with the freed\nbic-\u003ebfqq.\n\nFix the problem by always freeing bfqq after bic_set_bfqq()."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-11T19:36:22.378Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/7f77f3dab5066a7c9da73d72d1eee895ff84a8d5"
            },
            {
              "url": "https://git.kernel.org/stable/c/511c922c5bf6c8a166bea826e702336bc2424140"
            },
            {
              "url": "https://git.kernel.org/stable/c/cb1876fc33af26d00efdd473311f1b664c77c44e"
            },
            {
              "url": "https://git.kernel.org/stable/c/b600de2d7d3a16f9007fad1bdae82a3951a26af2"
            }
          ],
          "title": "block, bfq: fix uaf for bfqq in bic_set_bfqq()",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2023-52983",
        "datePublished": "2025-03-27T16:43:21.372Z",
        "dateReserved": "2025-03-27T16:40:15.740Z",
        "dateUpdated": "2026-05-11T19:36:22.378Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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  • 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.
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Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    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.