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

Vulnerability from cvelistv5 – Published: 2025-12-30 12:03 – Updated: 2026-08-05 08:59
VLAI
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
References
Impacted products
Vendor Product Version
Linux Linux Affected: 008d3825a805557464c5e75f9eb806a3aa2f5e6d , < 1d5ad0a874ddfcee9f932f54b1d34cbe8b9ddcfe (git)
Affected: 008d3825a805557464c5e75f9eb806a3aa2f5e6d , < 3593e8efc9f0dac6be70bd5c964eadaa86bf2713 (git)
Affected: 008d3825a805557464c5e75f9eb806a3aa2f5e6d , < d3e1e24604031b0d83b6c2d38f54eeea265cfcc0 (git)
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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)
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{
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        }
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              "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."
            }
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    "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"
  },
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    "redhat_vex": {
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      "current_release_date": "2026-06-30T10:28:18+00:00",
      "cve": "CVE-2022-50785",
      "id": "CVE-2022-50785",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fsi: occ: Prevent use after free",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50785.json",
      "version": "3"
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    "suse_vex": {
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      "current_release_date": "2026-07-25T17:04:45Z",
      "cve": "CVE-2022-50785",
      "id": "CVE-2022-50785",
      "initial_release_date": "2025-12-31T00:32:19Z",
      "product_status:known_not_affected": "453",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-50785",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-50785.json",
      "version": "11"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.