CVE-2022-49234 (GCVE-0-2022-49234)
Vulnerability from cvelistv5
Published
2025-02-26 01:55
Modified
2026-08-05 08:54
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: dsa: Avoid cross-chip syncing of VLAN filtering Changes to VLAN filtering are not applicable to cross-chip notifications. On a system like this: .-----. .-----. .-----. | sw1 +---+ sw2 +---+ sw3 | '-1-2-' '-1-2-' '-1-2-' Before this change, upon sw1p1 leaving a bridge, a call to dsa_port_vlan_filtering would also be made to sw2p1 and sw3p1. In this scenario: .---------. .-----. .-----. | sw1 +---+ sw2 +---+ sw3 | '-1-2-3-4-' '-1-2-' '-1-2-' When sw1p4 would leave a bridge, dsa_port_vlan_filtering would be called for sw2 and sw3 with a non-existing port - leading to array out-of-bounds accesses and crashes on mv88e6xxx.
References
Impacted products
Vendor Product Version
Linux Linux Version: d371b7c92d190448f3ccbf082c90bf929285f648
Version: d371b7c92d190448f3ccbf082c90bf929285f648
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/dsa/switch.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e1f2a4dd8d433eec393d09273a78a3d3551339cf",
              "status": "affected",
              "version": "d371b7c92d190448f3ccbf082c90bf929285f648",
              "versionType": "git"
            },
            {
              "lessThan": "108dc8741c203e9d6ce4e973367f1bac20c7192b",
              "status": "affected",
              "version": "d371b7c92d190448f3ccbf082c90bf929285f648",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/dsa/switch.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.2"
            },
            {
              "lessThan": "5.2",
              "status": "unaffected",
              "version": "0",
              "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": "5.17.2",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.18",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: Avoid cross-chip syncing of VLAN filtering\n\nChanges to VLAN filtering are not applicable to cross-chip\nnotifications.\n\nOn a system like this:\n\n.-----.   .-----.   .-----.\n| sw1 +---+ sw2 +---+ sw3 |\n\u0027-1-2-\u0027   \u0027-1-2-\u0027   \u0027-1-2-\u0027\n\nBefore this change, upon sw1p1 leaving a bridge, a call to\ndsa_port_vlan_filtering would also be made to sw2p1 and sw3p1.\n\nIn this scenario:\n\n.---------.   .-----.   .-----.\n|   sw1   +---+ sw2 +---+ sw3 |\n\u0027-1-2-3-4-\u0027   \u0027-1-2-\u0027   \u0027-1-2-\u0027\n\nWhen sw1p4 would leave a bridge, dsa_port_vlan_filtering would be\ncalled for sw2 and sw3 with a non-existing port - leading to array\nout-of-bounds accesses and crashes on mv88e6xxx."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation requires local netlink/ioctl bridge configuration (enslave a DSA user port then leave the bridge); the buggy path is not reachable from remote packet processing.\nAC:L - On a multi-chip DSA fabric with unequal port counts (the severe but realistic deployment), an attacker who can configure bridges can reliably trigger the OOB by enabling vlan_filtering, joining a high-indexed port, then removing it\u2014no conditions outside attacker control.\nPR:L - Triggering requires CAP_NET_ADMIN to manipulate bridge membership of DSA ports; per kernel CNA guidance that capability is treated as Low when obtainable in a user/network namespace that holds those ports, not full init-namespace root beyond that.\nUI:N - The attacker performs the bridge join/leave operations themselves; no separate victim action is required.\nS:U - Impact is confined to the host kernel/DSA subsystem; this is not a VM escape, IOMMU bypass, or other cross-authority boundary crossing.\nC:H - The bug is an out-of-bounds access on the dsa_switch flexible ports array (and related structures), which reads past the allocation and can disclose adjacent kernel memory.\nI:H - For drivers without vlan_filtering_is_global (including mv88e6xxx), dsa_port_vlan_filtering writes dp-\u003evlan_filtering through the OOB port pointer, producing an out-of-bounds write exploitable for memory corruption.\nA:H - The same OOB/NULL path causes kernel oops/crashes on mv88e6xxx and peer switches when a non-existent port index is used, fully disrupting system availability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:54:26.338Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e1f2a4dd8d433eec393d09273a78a3d3551339cf"
        },
        {
          "url": "https://git.kernel.org/stable/c/108dc8741c203e9d6ce4e973367f1bac20c7192b"
        }
      ],
      "title": "net: dsa: Avoid cross-chip syncing of VLAN filtering",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49234",
    "datePublished": "2025-02-26T01:55:59.615Z",
    "dateReserved": "2025-02-26T01:49:39.294Z",
    "dateUpdated": "2026-08-05T08:54:26.338Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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