CVE-2022-50059 (GCVE-0-2022-50059)
Vulnerability from cvelistv5
Published
2025-06-18 11:02
Modified
2026-08-05 08:57
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ceph: don't leak snap_rwsem in handle_cap_grant When handle_cap_grant is called on an IMPORT op, then the snap_rwsem is held and the function is expected to release it before returning. It currently fails to do that in all cases which could lead to a deadlock.
References
Impacted products
Vendor Product Version
Linux Linux Version: 6f05b30ea063a2a05dda47a4105a69267ae5270f
Version: 6f05b30ea063a2a05dda47a4105a69267ae5270f
Version: 6f05b30ea063a2a05dda47a4105a69267ae5270f
Version: 6f05b30ea063a2a05dda47a4105a69267ae5270f
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ceph/caps.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "aee18421bda6bf12a7cba6a3d7751c0e1cfd0094",
              "status": "affected",
              "version": "6f05b30ea063a2a05dda47a4105a69267ae5270f",
              "versionType": "git"
            },
            {
              "lessThan": "f546faa216d0f53a42ca73ba1fd8c48765b22d77",
              "status": "affected",
              "version": "6f05b30ea063a2a05dda47a4105a69267ae5270f",
              "versionType": "git"
            },
            {
              "lessThan": "a090cc69699ec2d11b5e34cee8c61f0d4b0068cb",
              "status": "affected",
              "version": "6f05b30ea063a2a05dda47a4105a69267ae5270f",
              "versionType": "git"
            },
            {
              "lessThan": "58dd4385577ed7969b80cdc9e2a31575aba6c712",
              "status": "affected",
              "version": "6f05b30ea063a2a05dda47a4105a69267ae5270f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ceph/caps.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.8"
            },
            {
              "lessThan": "5.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.138",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.63",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.19.*",
              "status": "unaffected",
              "version": "5.19.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.138",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.63",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19.4",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nceph: don\u0027t leak snap_rwsem in handle_cap_grant\n\nWhen handle_cap_grant is called on an IMPORT op, then the snap_rwsem is\nheld and the function is expected to release it before returning. It\ncurrently fails to do that in all cases which could lead to a deadlock."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The bug is reached while processing CEPH_MSG_CLIENT_CAPS IMPORT messages from a remote Ceph MDS over the TCP messenger into ceph_handle_caps()\u2192handle_cap_grant(); a malicious, compromised, or on-path MDS triggers it purely with network traffic.\nAC:L - A malicious MDS fully controls IMPORT content and migrate-seq values, and can force the i_auth_cap!=cap state that skips up_read(\u0026snap_rwsem); the condition is attacker-driven and reliably repeatable with no uncontrolled race or layout dependency.\nPR:N - Exploitation requires no privileges on the victim client\u2014the attacking MDS peer needs no local account or capability, matching other CephFS client MDS-message bugs scored PR:N.\nUI:N - With CephFS already mounted (normal deployment state), the MDS can unilaterally emit cap IMPORT messages during migration/reconnect without any further victim action at exploit time.\nS:U - The leaked snap_rwsem and resulting hang stay inside the client kernel/CephFS mount authority; there is no VM escape, IOMMU bypass, or other cross-boundary effect.\nC:N - The defect is a missing up_read on snap_rwsem that only deadlocks waiters; it does not corrupt memory, disclose kernel contents, or provide a read primitive.\nI:N - There is no write primitive, type confusion, or other integrity-affecting corruption\u2014only a lock leak that blocks subsequent snap_rwsem writers with no attacker-controlled data modification.\nA:H - Leaking the snap_rwsem read lock causes subsequent down_write paths (snap updates, IMPORT with snaptrace, realm work) and CephFS operations to hang indefinitely, a full denial of service requiring reboot."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:57:15.234Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/aee18421bda6bf12a7cba6a3d7751c0e1cfd0094"
        },
        {
          "url": "https://git.kernel.org/stable/c/f546faa216d0f53a42ca73ba1fd8c48765b22d77"
        },
        {
          "url": "https://git.kernel.org/stable/c/a090cc69699ec2d11b5e34cee8c61f0d4b0068cb"
        },
        {
          "url": "https://git.kernel.org/stable/c/58dd4385577ed7969b80cdc9e2a31575aba6c712"
        }
      ],
      "title": "ceph: don\u0027t leak snap_rwsem in handle_cap_grant",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50059",
    "datePublished": "2025-06-18T11:02:07.945Z",
    "dateReserved": "2025-06-18T10:57:27.404Z",
    "dateUpdated": "2026-08-05T08:57:15.234Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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