github - ghsa-xpfg-hqmq-gr2w

GHSA-XPFG-HQMQ-GR2W

Vulnerability from github – Published: 2025-09-23 15:31 – Updated: 2025-09-23 15:31

Details

In the Linux kernel, the following vulnerability has been resolved:

net: dsa: fix panic on shutdown if multi-chip tree failed to probe

DSA probing is atypical because a tree of devices must probe all at once, so out of N switches which call dsa_tree_setup_routing_table() during probe, for (N - 1) of them, "complete" will return false and they will exit probing early. The Nth switch will set up the whole tree on their behalf.

The implication is that for (N - 1) switches, the driver binds to the device successfully, without doing anything. When the driver is bound, the ->shutdown() method may run. But if the Nth switch has failed to initialize the tree, there is nothing to do for the (N - 1) driver instances, since the slave devices have not been created, etc. Moreover, dsa_switch_shutdown() expects that the calling @ds has been in fact initialized, so it jumps at dereferencing the various data structures, which is incorrect.

Avoid the ensuing NULL pointer dereferences by simply checking whether the Nth switch has previously set "ds->setup = true" for the switch which is currently shutting down. The entire setup is serialized under dsa2_mutex which we already hold.

Severity ?

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49195"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-26T07:00:56Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: fix panic on shutdown if multi-chip tree failed to probe\n\nDSA probing is atypical because a tree of devices must probe all at\nonce, so out of N switches which call dsa_tree_setup_routing_table()\nduring probe, for (N - 1) of them, \"complete\" will return false and they\nwill exit probing early. The Nth switch will set up the whole tree on\ntheir behalf.\n\nThe implication is that for (N - 1) switches, the driver binds to the\ndevice successfully, without doing anything. When the driver is bound,\nthe -\u003eshutdown() method may run. But if the Nth switch has failed to\ninitialize the tree, there is nothing to do for the (N - 1) driver\ninstances, since the slave devices have not been created, etc. Moreover,\ndsa_switch_shutdown() expects that the calling @ds has been in fact\ninitialized, so it jumps at dereferencing the various data structures,\nwhich is incorrect.\n\nAvoid the ensuing NULL pointer dereferences by simply checking whether\nthe Nth switch has previously set \"ds-\u003esetup = true\" for the switch\nwhich is currently shutting down. The entire setup is serialized under\ndsa2_mutex which we already hold.",
  "id": "GHSA-xpfg-hqmq-gr2w",
  "modified": "2025-09-23T15:31:08Z",
  "published": "2025-09-23T15:31:08Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49195"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8fd36358ce82382519b50b05f437493e1e00c4a9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/95df5cd5a446df6738d2d45872e08594819080e4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b6e668ff43ebd87ccc8a19e5481345c428672295"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b864d5350c18bea9369d0bdd9e7eb6f6172cc283"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2022-49195 (GCVE-0-2022-49195)

Vulnerability from cvelistv5 – Published: 2025-02-26 01:55 – Updated: 2025-05-04 08:32

Summary

In the Linux kernel, the following vulnerability has been resolved: net: dsa: fix panic on shutdown if multi-chip tree failed to probe DSA probing is atypical because a tree of devices must probe all at once, so out of N switches which call dsa_tree_setup_routing_table() during probe, for (N - 1) of them, "complete" will return false and they will exit probing early. The Nth switch will set up the whole tree on their behalf. The implication is that for (N - 1) switches, the driver binds to the device successfully, without doing anything. When the driver is bound, the ->shutdown() method may run. But if the Nth switch has failed to initialize the tree, there is nothing to do for the (N - 1) driver instances, since the slave devices have not been created, etc. Moreover, dsa_switch_shutdown() expects that the calling @ds has been in fact initialized, so it jumps at dereferencing the various data structures, which is incorrect. Avoid the ensuing NULL pointer dereferences by simply checking whether the Nth switch has previously set "ds->setup = true" for the switch which is currently shutting down. The entire setup is serialized under dsa2_mutex which we already hold.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/95df5cd5a446df673…
	https://git.kernel.org/stable/c/b6e668ff43ebd87cc…
	https://git.kernel.org/stable/c/b864d5350c18bea93…
	https://git.kernel.org/stable/c/8fd36358ce8238251…

Impacted products

Vendor

Product

Version

Linux

Affected: 0650bf52b31ff35dc6430fc2e37969c36baba724 , < 95df5cd5a446df6738d2d45872e08594819080e4 (git)
Affected: 0650bf52b31ff35dc6430fc2e37969c36baba724 , < b6e668ff43ebd87ccc8a19e5481345c428672295 (git)
Affected: 0650bf52b31ff35dc6430fc2e37969c36baba724 , < b864d5350c18bea9369d0bdd9e7eb6f6172cc283 (git)
Affected: 0650bf52b31ff35dc6430fc2e37969c36baba724 , < 8fd36358ce82382519b50b05f437493e1e00c4a9 (git)

Linux

Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.33 , ≤ 5.15.* (semver)
Unaffected: 5.16.19 , ≤ 5.16.* (semver)
Unaffected: 5.17.2 , ≤ 5.17.* (semver)
Unaffected: 5.18 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/dsa/dsa2.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "95df5cd5a446df6738d2d45872e08594819080e4",
              "status": "affected",
              "version": "0650bf52b31ff35dc6430fc2e37969c36baba724",
              "versionType": "git"
            },
            {
              "lessThan": "b6e668ff43ebd87ccc8a19e5481345c428672295",
              "status": "affected",
              "version": "0650bf52b31ff35dc6430fc2e37969c36baba724",
              "versionType": "git"
            },
            {
              "lessThan": "b864d5350c18bea9369d0bdd9e7eb6f6172cc283",
              "status": "affected",
              "version": "0650bf52b31ff35dc6430fc2e37969c36baba724",
              "versionType": "git"
            },
            {
              "lessThan": "8fd36358ce82382519b50b05f437493e1e00c4a9",
              "status": "affected",
              "version": "0650bf52b31ff35dc6430fc2e37969c36baba724",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/dsa/dsa2.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": "5.15.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.16.*",
              "status": "unaffected",
              "version": "5.16.19",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.17.*",
              "status": "unaffected",
              "version": "5.17.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.33",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.16.19",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.17.2",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.18",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: fix panic on shutdown if multi-chip tree failed to probe\n\nDSA probing is atypical because a tree of devices must probe all at\nonce, so out of N switches which call dsa_tree_setup_routing_table()\nduring probe, for (N - 1) of them, \"complete\" will return false and they\nwill exit probing early. The Nth switch will set up the whole tree on\ntheir behalf.\n\nThe implication is that for (N - 1) switches, the driver binds to the\ndevice successfully, without doing anything. When the driver is bound,\nthe -\u003eshutdown() method may run. But if the Nth switch has failed to\ninitialize the tree, there is nothing to do for the (N - 1) driver\ninstances, since the slave devices have not been created, etc. Moreover,\ndsa_switch_shutdown() expects that the calling @ds has been in fact\ninitialized, so it jumps at dereferencing the various data structures,\nwhich is incorrect.\n\nAvoid the ensuing NULL pointer dereferences by simply checking whether\nthe Nth switch has previously set \"ds-\u003esetup = true\" for the switch\nwhich is currently shutting down. The entire setup is serialized under\ndsa2_mutex which we already hold."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T08:32:07.310Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/95df5cd5a446df6738d2d45872e08594819080e4"
        },
        {
          "url": "https://git.kernel.org/stable/c/b6e668ff43ebd87ccc8a19e5481345c428672295"
        },
        {
          "url": "https://git.kernel.org/stable/c/b864d5350c18bea9369d0bdd9e7eb6f6172cc283"
        },
        {
          "url": "https://git.kernel.org/stable/c/8fd36358ce82382519b50b05f437493e1e00c4a9"
        }
      ],
      "title": "net: dsa: fix panic on shutdown if multi-chip tree failed to probe",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49195",
    "datePublished": "2025-02-26T01:55:40.082Z",
    "dateReserved": "2025-02-26T01:49:39.288Z",
    "dateUpdated": "2025-05-04T08:32:07.310Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-XPFG-HQMQ-GR2W

CVE-2022-49195 (GCVE-0-2022-49195)

Tags

Sightings

Nomenclature