CVE-2022-50307 (GCVE-0-2022-50307)
Vulnerability from cvelistv5
Published
2025-09-15 14:46
Modified
2025-09-15 14:46
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: s390/cio: fix out-of-bounds access on cio_ignore free The channel-subsystem-driver scans for newly available devices whenever device-IDs are removed from the cio_ignore list using a command such as: echo free >/proc/cio_ignore Since an I/O device scan might interfer with running I/Os, commit 172da89ed0ea ("s390/cio: avoid excessive path-verification requests") introduced an optimization to exclude online devices from the scan. The newly added check for online devices incorrectly assumes that an I/O-subchannel's drvdata points to a struct io_subchannel_private. For devices that are bound to a non-default I/O subchannel driver, such as the vfio_ccw driver, this results in an out-of-bounds read access during each scan. Fix this by changing the scan logic to rely on a driver-independent online indication. For this we can use struct subchannel->config.ena, which is the driver's requested subchannel-enabled state. Since I/Os can only be started on enabled subchannels, this matches the intent of the original optimization of not scanning devices where I/O might be running.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0e501fd0f38e42304bfa0d46a812d93f80294a87
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/106ab66cf5467726ca5ead51623043d37c06820a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1b6074112742f65ece71b0f299ca5a6a887d2db6
Impacted products
Vendor Product Version
Linux Linux Version: 172da89ed0eaf9d9348f5decb86ad04c624b39d1
Version: 172da89ed0eaf9d9348f5decb86ad04c624b39d1
Version: 172da89ed0eaf9d9348f5decb86ad04c624b39d1
 Create a notification for this product.
   Linux Linux Version: 5.15
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/s390/cio/css.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0e501fd0f38e42304bfa0d46a812d93f80294a87",
              "status": "affected",
              "version": "172da89ed0eaf9d9348f5decb86ad04c624b39d1",
              "versionType": "git"
            },
            {
              "lessThan": "106ab66cf5467726ca5ead51623043d37c06820a",
              "status": "affected",
              "version": "172da89ed0eaf9d9348f5decb86ad04c624b39d1",
              "versionType": "git"
            },
            {
              "lessThan": "1b6074112742f65ece71b0f299ca5a6a887d2db6",
              "status": "affected",
              "version": "172da89ed0eaf9d9348f5decb86ad04c624b39d1",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/s390/cio/css.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.78",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.7",
              "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": "5.15.78",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.7",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/cio: fix out-of-bounds access on cio_ignore free\n\nThe channel-subsystem-driver scans for newly available devices whenever\ndevice-IDs are removed from the cio_ignore list using a command such as:\n\n  echo free \u003e/proc/cio_ignore\n\nSince an I/O device scan might interfer with running I/Os, commit\n172da89ed0ea (\"s390/cio: avoid excessive path-verification requests\")\nintroduced an optimization to exclude online devices from the scan.\n\nThe newly added check for online devices incorrectly assumes that\nan I/O-subchannel\u0027s drvdata points to a struct io_subchannel_private.\nFor devices that are bound to a non-default I/O subchannel driver, such\nas the vfio_ccw driver, this results in an out-of-bounds read access\nduring each scan.\n\nFix this by changing the scan logic to rely on a driver-independent\nonline indication. For this we can use struct subchannel-\u003econfig.ena,\nwhich is the driver\u0027s requested subchannel-enabled state. Since I/Os\ncan only be started on enabled subchannels, this matches the intent\nof the original optimization of not scanning devices where I/O might\nbe running."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-15T14:46:02.608Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0e501fd0f38e42304bfa0d46a812d93f80294a87"
        },
        {
          "url": "https://git.kernel.org/stable/c/106ab66cf5467726ca5ead51623043d37c06820a"
        },
        {
          "url": "https://git.kernel.org/stable/c/1b6074112742f65ece71b0f299ca5a6a887d2db6"
        }
      ],
      "title": "s390/cio: fix out-of-bounds access on cio_ignore free",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50307",
    "datePublished": "2025-09-15T14:46:02.608Z",
    "dateReserved": "2025-09-15T14:18:36.813Z",
    "dateUpdated": "2025-09-15T14:46:02.608Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50307\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-15T15:15:42.377\",\"lastModified\":\"2025-09-15T15:22:27.090\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ns390/cio: fix out-of-bounds access on cio_ignore free\\n\\nThe channel-subsystem-driver scans for newly available devices whenever\\ndevice-IDs are removed from the cio_ignore list using a command such as:\\n\\n  echo free \u003e/proc/cio_ignore\\n\\nSince an I/O device scan might interfer with running I/Os, commit\\n172da89ed0ea (\\\"s390/cio: avoid excessive path-verification requests\\\")\\nintroduced an optimization to exclude online devices from the scan.\\n\\nThe newly added check for online devices incorrectly assumes that\\nan I/O-subchannel\u0027s drvdata points to a struct io_subchannel_private.\\nFor devices that are bound to a non-default I/O subchannel driver, such\\nas the vfio_ccw driver, this results in an out-of-bounds read access\\nduring each scan.\\n\\nFix this by changing the scan logic to rely on a driver-independent\\nonline indication. For this we can use struct subchannel-\u003econfig.ena,\\nwhich is the driver\u0027s requested subchannel-enabled state. Since I/Os\\ncan only be started on enabled subchannels, this matches the intent\\nof the original optimization of not scanning devices where I/O might\\nbe running.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0e501fd0f38e42304bfa0d46a812d93f80294a87\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/106ab66cf5467726ca5ead51623043d37c06820a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1b6074112742f65ece71b0f299ca5a6a887d2db6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.