Vulnerability-Lookup

GHSA-WV6P-QH73-F5XP

Vulnerability from github – Published: 2025-12-30 12:30 – Updated: 2026-08-04 12:34

Details

In the Linux kernel, the following vulnerability has been resolved:

fsi: occ: Prevent use after free

Use get_device and put_device in the open and close functions to make sure the device doesn't get freed while a file descriptor is open. Also, lock around the freeing of the device buffer and check the buffer before using it in the submit function.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2022-50785"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-30T12:15:44Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfsi: occ: Prevent use after free\n\nUse get_device and put_device in the open and close functions to\nmake sure the device doesn\u0027t get freed while a file descriptor is\nopen.\nAlso, lock around the freeing of the device buffer and check the\nbuffer before using it in the submit function.",
  "id": "GHSA-wv6p-qh73-f5xp",
  "modified": "2026-08-04T12:34:45Z",
  "published": "2025-12-30T12:30:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50785"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1d5ad0a874ddfcee9f932f54b1d34cbe8b9ddcfe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3593e8efc9f0dac6be70bd5c964eadaa86bf2713"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d3e1e24604031b0d83b6c2d38f54eeea265cfcc0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2022-50785 (GCVE-0-2022-50785)

Vulnerability from cvelistv5 – Published: 2025-12-30 12:03 – Updated: 2026-08-05 08:59

Title

fsi: occ: Prevent use after free

Summary

In the Linux kernel, the following vulnerability has been resolved: fsi: occ: Prevent use after free Use get_device and put_device in the open and close functions to make sure the device doesn't get freed while a file descriptor is open. Also, lock around the freeing of the device buffer and check the buffer before using it in the submit function.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/1d5ad0a874ddfcee9…
https://git.kernel.org/stable/c/3593e8efc9f0dac6b…
https://git.kernel.org/stable/c/d3e1e24604031b0d8…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 008d3825a805557464c5e75f9eb806a3aa2f5e6d , < 1d5ad0a874ddfcee9f932f54b1d34cbe8b9ddcfe (git) Affected: 008d3825a805557464c5e75f9eb806a3aa2f5e6d , < 3593e8efc9f0dac6be70bd5c964eadaa86bf2713 (git) Affected: 008d3825a805557464c5e75f9eb806a3aa2f5e6d , < d3e1e24604031b0d83b6c2d38f54eeea265cfcc0 (git)
Linux	Linux	Affected: 5.16 Unaffected: 0 , < 5.16 (semver) Unaffected: 5.19.17 , ≤ 5.19.* (semver) Unaffected: 6.0.3 , ≤ 6.0.* (semver) Unaffected: 6.1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/fsi/fsi-occ.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1d5ad0a874ddfcee9f932f54b1d34cbe8b9ddcfe",
              "status": "affected",
              "version": "008d3825a805557464c5e75f9eb806a3aa2f5e6d",
              "versionType": "git"
            },
            {
              "lessThan": "3593e8efc9f0dac6be70bd5c964eadaa86bf2713",
              "status": "affected",
              "version": "008d3825a805557464c5e75f9eb806a3aa2f5e6d",
              "versionType": "git"
            },
            {
              "lessThan": "d3e1e24604031b0d83b6c2d38f54eeea265cfcc0",
              "status": "affected",
              "version": "008d3825a805557464c5e75f9eb806a3aa2f5e6d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/fsi/fsi-occ.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.16"
            },
            {
              "lessThan": "5.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.19.*",
              "status": "unaffected",
              "version": "5.19.17",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19.17",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.3",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfsi: occ: Prevent use after free\n\nUse get_device and put_device in the open and close functions to\nmake sure the device doesn\u0027t get freed while a file descriptor is\nopen.\nAlso, lock around the freeing of the device buffer and check the\nbuffer before using it in the submit function."
        }
      ],
      "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 reached by opening/writing the local /dev/occN miscdevice or by reading OCC hwmon sysfs attributes that call fsi_occ_submit(); it is not reachable from network packet processing.\nAC:L - An attacker can continuously drive fsi_occ_submit via hwmon reads or /dev/occ I/O while inducing OCC/FSI teardown (host power-cycle or FSI rescan on OpenBMC), so both sides of the remove-vs-submit race are attacker-controlled.\nPR:L - OCC hwmon sensor attributes are mode 0444, so any local user can invoke the vulnerable fsi_occ_submit path; OpenBMC deployments also commonly grant /dev/occ to non-root service/operator accounts without requiring real root.\nUI:N - The attacker directly performs the device I/O and teardown sequence; no separate victim action is required.\nS:U - This is a same-host kernel heap use-after-free within the BMC kernel\u0027s security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - occ_remove kvfree()s the shared ~8KB occ-\u003ebuffer while submit still uses it, yielding a reclaimable use-after-free that enables arbitrary kernel memory disclosure.\nI:H - The same buffer/device UAF is exploitable for heap corruption and control-flow hijacking via reclaim of the freed kvmalloc object or the freed struct occ.\nA:H - Use-after-free of occ-\u003ebuffer or the occ device object reliably causes kernel oops/panic even when not fully exploited for code execution."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:59:46.661Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1d5ad0a874ddfcee9f932f54b1d34cbe8b9ddcfe"
        },
        {
          "url": "https://git.kernel.org/stable/c/3593e8efc9f0dac6be70bd5c964eadaa86bf2713"
        },
        {
          "url": "https://git.kernel.org/stable/c/d3e1e24604031b0d83b6c2d38f54eeea265cfcc0"
        }
      ],
      "title": "fsi: occ: Prevent use after free",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50785",
    "datePublished": "2025-12-30T12:03:22.224Z",
    "dateReserved": "2025-12-24T13:02:21.548Z",
    "dateUpdated": "2026-08-05T08:59:46.661Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.