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CVE-2022-49769 (GCVE-0-2022-49769)

Vulnerability from cvelistv5 – Published: 2025-05-01 14:09 – Updated: 2026-05-11 19:06
VLAI
Title
gfs2: Check sb_bsize_shift after reading superblock
Summary
In the Linux kernel, the following vulnerability has been resolved: gfs2: Check sb_bsize_shift after reading superblock Fuzzers like to scribble over sb_bsize_shift but in reality it's very unlikely that this field would be corrupted on its own. Nevertheless it should be checked to avoid the possibility of messy mount errors due to bad calculations. It's always a fixed value based on the block size so we can just check that it's the expected value. Tested with: mkfs.gfs2 -O -p lock_nolock /dev/vdb for i in 0 -1 64 65 32 33; do gfs2_edit -p sb field sb_bsize_shift $i /dev/vdb mount /dev/vdb /mnt/test && umount /mnt/test done Before this patch we get a withdraw after [ 76.413681] gfs2: fsid=loop0.0: fatal: invalid metadata block [ 76.413681] bh = 19 (type: exp=5, found=4) [ 76.413681] function = gfs2_meta_buffer, file = fs/gfs2/meta_io.c, line = 492 and with UBSAN configured we also get complaints like [ 76.373395] UBSAN: shift-out-of-bounds in fs/gfs2/ops_fstype.c:295:19 [ 76.373815] shift exponent 4294967287 is too large for 64-bit type 'long unsigned int' After the patch, these complaints don't appear, mount fails immediately and we get an explanation in dmesg.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b3b94faa5fe5968827ba0640ee9fba4b3e7f736e , < d6b1e8ea6f3418c3b461ad5a35cdc93c996b2c87 (git)
Affected: b3b94faa5fe5968827ba0640ee9fba4b3e7f736e , < 1ad197097343568066a8ffaa27ee7d0ae6d9f476 (git)
Affected: b3b94faa5fe5968827ba0640ee9fba4b3e7f736e , < 15c83fa0fd659dd9fbdc940a560b61236e876a80 (git)
Affected: b3b94faa5fe5968827ba0640ee9fba4b3e7f736e , < 8b6534c9ae9dba5489703a19d8ba6c8f2cfa33c2 (git)
Affected: b3b94faa5fe5968827ba0640ee9fba4b3e7f736e , < 5fa30be7ba81191b0a0c7239a89befc0c94286d5 (git)
Affected: b3b94faa5fe5968827ba0640ee9fba4b3e7f736e , < 28275a7c84d21c55ab3282d897f284d8d527173c (git)
Affected: b3b94faa5fe5968827ba0640ee9fba4b3e7f736e , < 16670534c7cff1acd918a6a5ec751b14e7436b76 (git)
Affected: b3b94faa5fe5968827ba0640ee9fba4b3e7f736e , < 670f8ce56dd0632dc29a0322e188cc73ce3c6b92 (git)
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Linux Linux Affected: 2.6.19
Unaffected: 0 , < 2.6.19 (semver)
Unaffected: 4.9.334 , ≤ 4.9.* (semver)
Unaffected: 4.14.300 , ≤ 4.14.* (semver)
Unaffected: 4.19.267 , ≤ 4.19.* (semver)
Unaffected: 5.4.225 , ≤ 5.4.* (semver)
Unaffected: 5.10.156 , ≤ 5.10.* (semver)
Unaffected: 5.15.80 , ≤ 5.15.* (semver)
Unaffected: 6.0.10 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: gfs2: Comprobaci\u00f3n de sb_bsize_shift tras leer el superbloque. A los fuzzers les gusta manipular sb_bsize_shift, pero en realidad es muy improbable que este campo se corrompa por s\u00ed solo. Sin embargo, conviene comprobarlo para evitar errores de montaje problem\u00e1ticos debido a c\u00e1lculos err\u00f3neos. Siempre es un valor fijo basado en el tama\u00f1o del bloque, por lo que podemos comprobar que sea el valor esperado. Probado con: mkfs.gfs2 -O -p lock_nolock /dev/vdb for i in 0 -1 64 65 32 33; Antes de este parche obtenemos una retirada despu\u00e9s de [ 76.413681] gfs2: fsid=loop0.0: fatal: bloque de metadatos no v\u00e1lido [ 76.413681] bh = 19 (tipo: exp=5, encontrado=4) [ 76.413681] funci\u00f3n = gfs2_meta_buffer, archivo = fs/gfs2/meta_io.c, l\u00ednea = 492 y con UBSAN configurado tambi\u00e9n obtenemos quejas como [ 76.373395] UBSAN: cambio fuera de los l\u00edmites en fs/gfs2/ops_fstype.c:295:19 [ 76.373815] cambio El exponente 4294967287 es demasiado grande para el tipo de 64 bits \u0027long unsigned int\u0027. Despu\u00e9s del parche, estas quejas no aparecen, el montaje falla inmediatamente y obtenemos una explicaci\u00f3n en dmesg."
          }
        ],
        "id": "CVE-2022-49769",
        "lastModified": "2026-06-17T05:19:06.193",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2025-05-01T15:15:59.710",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/15c83fa0fd659dd9fbdc940a560b61236e876a80"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/16670534c7cff1acd918a6a5ec751b14e7436b76"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/1ad197097343568066a8ffaa27ee7d0ae6d9f476"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/28275a7c84d21c55ab3282d897f284d8d527173c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/5fa30be7ba81191b0a0c7239a89befc0c94286d5"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/670f8ce56dd0632dc29a0322e188cc73ce3c6b92"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/8b6534c9ae9dba5489703a19d8ba6c8f2cfa33c2"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/d6b1e8ea6f3418c3b461ad5a35cdc93c996b2c87"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:38:29+00:00",
      "cve": "CVE-2022-49769",
      "id": "CVE-2022-49769",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: gfs2: Check sb_bsize_shift after reading superblock",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49769.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T01:28:58Z",
      "cve": "CVE-2022-49769",
      "id": "CVE-2022-49769",
      "initial_release_date": "2025-05-07T02:20:18Z",
      "product_status:known_affected": "466",
      "product_status:known_not_affected": "182",
      "product_status:recommended": "316",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49769",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49769.json",
      "version": "49"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.


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.