CVE-2022-50097 (GCVE-0-2022-50097)

Vulnerability from cvelistv5 – Published: 2025-06-18 11:02 – Updated: 2026-08-05 08:57
VLAI
Title
video: fbdev: s3fb: Check the size of screen before memset_io()
Summary
In the Linux kernel, the following vulnerability has been resolved: video: fbdev: s3fb: Check the size of screen before memset_io() In the function s3fb_set_par(), the value of 'screen_size' is calculated by the user input. If the user provides the improper value, the value of 'screen_size' may larger than 'info->screen_size', which may cause the following bug: [ 54.083733] BUG: unable to handle page fault for address: ffffc90003000000 [ 54.083742] #PF: supervisor write access in kernel mode [ 54.083744] #PF: error_code(0x0002) - not-present page [ 54.083760] RIP: 0010:memset_orig+0x33/0xb0 [ 54.083782] Call Trace: [ 54.083788] s3fb_set_par+0x1ec6/0x4040 [ 54.083806] fb_set_var+0x604/0xeb0 [ 54.083836] do_fb_ioctl+0x234/0x670 Fix the this by checking the value of 'screen_size' before memset_io().
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a268422de8bf1b4c0cb97987b6c329c9f6a3da4b , < 574912261528589012b61f82d368256247c3a5a8 (git)
Affected: a268422de8bf1b4c0cb97987b6c329c9f6a3da4b , < 3c35a0dc2b4e7acf24c796043b64fa3eee799239 (git)
Affected: a268422de8bf1b4c0cb97987b6c329c9f6a3da4b , < eacb50f1733660911827d7c3720f4c5425d0cdda (git)
Affected: a268422de8bf1b4c0cb97987b6c329c9f6a3da4b , < 5e0da18956d38e7106664dc1d06367b22f06edd3 (git)
Affected: a268422de8bf1b4c0cb97987b6c329c9f6a3da4b , < ce50d94afcb8690813c5522f24cd38737657db81 (git)
Affected: a268422de8bf1b4c0cb97987b6c329c9f6a3da4b , < 52461d387cc8c8f8dc40320caa2e9e101f73e7ba (git)
Affected: a268422de8bf1b4c0cb97987b6c329c9f6a3da4b , < e2d7cacc6a2a1d77e7e20a492daf458a12cf19e0 (git)
Affected: a268422de8bf1b4c0cb97987b6c329c9f6a3da4b , < 6ba592fa014f21f35a8ee8da4ca7b95a018f13e8 (git)
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Linux Linux Affected: 2.6.21
Unaffected: 0 , < 2.6.21 (semver)
Unaffected: 4.14.291 , ≤ 4.14.* (semver)
Unaffected: 4.19.256 , ≤ 4.19.* (semver)
Unaffected: 5.4.211 , ≤ 5.4.* (semver)
Unaffected: 5.10.137 , ≤ 5.10.* (semver)
Unaffected: 5.15.61 , ≤ 5.15.* (semver)
Unaffected: 5.18.18 , ≤ 5.18.* (semver)
Unaffected: 5.19.2 , ≤ 5.19.* (semver)
Unaffected: 6.0 , ≤ * (original_commit_for_fix)
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              "value": "AV:L - The bug is triggered through the local fbdev ioctl path (open /dev/fbN, FBIOPUT_VSCREENINFO \u2192 do_fb_ioctl \u2192 fb_set_var \u2192 s3fb_set_par), not via network or adjacent protocols.\nAC:L - An attacker who can issue FBIOPUT_VSCREENINFO reliably controls xres_virtual/yres_virtual/bits_per_pixel to bypass s3fb_check_var (signed int mem overflow or bpp==0 text mode) and force an oversized memset_io; no race or external conditions are required.\nPR:L - There is no CAP_SYS_ADMIN check on FBIOPUT_VSCREENINFO; access is only gated by /dev/fbN DAC permissions (typically root:video 0660), so an unprivileged video-group user can reach the vulnerable code.\nUI:N - Exploitation requires only the attacker\u0027s own open/ioctl against the framebuffer device; no separate victim action is needed.\nS:U - This is a standard in-kernel driver memory-safety bug affecting the host kernel/device; it does not cross a VM, IOMMU, or other security authority boundary.\nC:N - The corruption is a memset_io of fixed zeros into the PCI framebuffer aperture (and past it into unmapped ioremap space); there is no out-of-bounds read or other information-disclosure primitive.\nI:H - User-controlled dimensions cause an out-of-bounds write via memset_io beyond info-\u003escreen_size into the mapped BAR (and beyond), which is kernel-mediated memory corruption of framebuffer/MMIO space.\nA:H - The demonstrated result is a kernel page-fault oops in memset when the write runs past the ioremap\u0027d region, which can panic or otherwise take down the system."
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvideo: fbdev: s3fb: Check the size of screen before memset_io()\n\nIn the function s3fb_set_par(), the value of \u0027screen_size\u0027 is\ncalculated by the user input. If the user provides the improper value,\nthe value of \u0027screen_size\u0027 may larger than \u0027info-\u003escreen_size\u0027, which\nmay cause the following bug:\n\n[   54.083733] BUG: unable to handle page fault for address: ffffc90003000000\n[   54.083742] #PF: supervisor write access in kernel mode\n[   54.083744] #PF: error_code(0x0002) - not-present page\n[   54.083760] RIP: 0010:memset_orig+0x33/0xb0\n[   54.083782] Call Trace:\n[   54.083788]  s3fb_set_par+0x1ec6/0x4040\n[   54.083806]  fb_set_var+0x604/0xeb0\n[   54.083836]  do_fb_ioctl+0x234/0x670\n\nFix the this by checking the value of \u0027screen_size\u0027 before memset_io()."
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          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: video: fbdev: s3fb: Verifique el tama\u00f1o de la pantalla antes de memset_io() En la funci\u00f3n s3fb_set_par(), el valor de \u0027screen_size\u0027 se calcula mediante la entrada del usuario. Si el usuario proporciona un valor incorrecto, el valor de \u0027screen_size\u0027 puede ser mayor que \u0027info-\u0026gt;screen_size\u0027, lo que puede causar el siguiente error: [ 54.083733] ERROR: no se puede manejar el error de p\u00e1gina para la direcci\u00f3n: ffffc90003000000 [ 54.083742] #PF: acceso de escritura del supervisor en modo kernel [ 54.083744] #PF: error_code(0x0002) - p\u00e1gina no presente [ 54.083760] RIP: 0010:memset_orig+0x33/0xb0 [ 54.083782] Rastreo de llamadas: [ 54.083788] s3fb_set_par+0x1ec6/0x4040 [ 54.083806] fb_set_var+0x604/0xeb0 [ 54.083836] do_fb_ioctl+0x234/0x670 Solucione este problema comprobando el valor de \u0027screen_size\u0027 antes de memset_io()."
          }
        ],
        "id": "CVE-2022-50097",
        "lastModified": "2026-08-04T10:18:04.907",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.2,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            },
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2025-06-18T11:15:38.963",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/3c35a0dc2b4e7acf24c796043b64fa3eee799239"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/52461d387cc8c8f8dc40320caa2e9e101f73e7ba"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/574912261528589012b61f82d368256247c3a5a8"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/5e0da18956d38e7106664dc1d06367b22f06edd3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/6ba592fa014f21f35a8ee8da4ca7b95a018f13e8"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/ce50d94afcb8690813c5522f24cd38737657db81"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/e2d7cacc6a2a1d77e7e20a492daf458a12cf19e0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/eacb50f1733660911827d7c3720f4c5425d0cdda"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:38:09+00:00",
      "cve": "CVE-2022-50097",
      "id": "CVE-2022-50097",
      "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: video: fbdev: s3fb: Check the size of screen before memset_io()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50097.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T16:51:54Z",
      "cve": "CVE-2022-50097",
      "id": "CVE-2022-50097",
      "initial_release_date": "2025-06-19T03:42:01Z",
      "product_status:known_affected": "344",
      "product_status:known_not_affected": "345",
      "product_status:recommended": "296",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-50097",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-50097.json",
      "version": "54"
    }
  }
}



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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

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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.



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.