CVE-2026-43205 (GCVE-0-2026-43205)
Vulnerability from cvelistv5
Published
2026-05-06 11:28
Modified
2026-05-11 22:20
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: dpaa2-switch: validate num_ifs to prevent out-of-bounds write The driver obtains sw_attr.num_ifs from firmware via dpsw_get_attributes() but never validates it against DPSW_MAX_IF (64). This value controls iteration in dpaa2_switch_fdb_get_flood_cfg(), which writes port indices into the fixed-size cfg->if_id[DPSW_MAX_IF] array. When firmware reports num_ifs >= 64, the loop can write past the array bounds. Add a bound check for num_ifs in dpaa2_switch_init(). dpaa2_switch_fdb_get_flood_cfg() appends the control interface (port num_ifs) after all matched ports. When num_ifs == DPSW_MAX_IF and all ports match the flood filter, the loop fills all 64 slots and the control interface write overflows by one entry. The check uses >= because num_ifs == DPSW_MAX_IF is also functionally broken. build_if_id_bitmap() silently drops any ID >= 64: if (id[i] < DPSW_MAX_IF) bmap[id[i] / 64] |= ...
References
Impacted products
Vendor Product Version
Linux Linux Version: 539dda3c5d190c5088b5e57944b1b482fcb464de
Version: 539dda3c5d190c5088b5e57944b1b482fcb464de
Version: 539dda3c5d190c5088b5e57944b1b482fcb464de
Version: 539dda3c5d190c5088b5e57944b1b482fcb464de
Version: 539dda3c5d190c5088b5e57944b1b482fcb464de
Version: 539dda3c5d190c5088b5e57944b1b482fcb464de
Version: 539dda3c5d190c5088b5e57944b1b482fcb464de
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c"
          ],
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        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "5.13"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "5.15.202",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.165",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.128",
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              "status": "unaffected",
              "version": "6.12.75",
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            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.16",
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            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.6",
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            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.202",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndpaa2-switch: validate num_ifs to prevent out-of-bounds write\n\nThe driver obtains sw_attr.num_ifs from firmware via dpsw_get_attributes()\nbut never validates it against DPSW_MAX_IF (64). This value controls\niteration in dpaa2_switch_fdb_get_flood_cfg(), which writes port indices\ninto the fixed-size cfg-\u003eif_id[DPSW_MAX_IF] array. When firmware reports\nnum_ifs \u003e= 64, the loop can write past the array bounds.\n\nAdd a bound check for num_ifs in dpaa2_switch_init().\n\ndpaa2_switch_fdb_get_flood_cfg() appends the control interface (port\nnum_ifs) after all matched ports. When num_ifs == DPSW_MAX_IF and all\nports match the flood filter, the loop fills all 64 slots and the control\ninterface write overflows by one entry.\n\nThe check uses \u003e= because num_ifs == DPSW_MAX_IF is also functionally\nbroken.\n\nbuild_if_id_bitmap() silently drops any ID \u003e= 64:\n      if (id[i] \u003c DPSW_MAX_IF)\n          bmap[id[i] / 64] |= ..."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:20:00.994Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a26dda3bae469c8e4e1b1993ad33dafa32d0fc28"
        },
        {
          "url": "https://git.kernel.org/stable/c/a3034a8d56174dd6464c46823438f25797910a8d"
        },
        {
          "url": "https://git.kernel.org/stable/c/b690635d4719214892855b79ce018d4b1672ac96"
        },
        {
          "url": "https://git.kernel.org/stable/c/8b841fd529db9faf8bc678d429d4bf4e98b10900"
        },
        {
          "url": "https://git.kernel.org/stable/c/89764cf44544e943230f5e03b8c40a90da26537c"
        },
        {
          "url": "https://git.kernel.org/stable/c/c18493f750208eb4ff1198fc5a02786b8b2d70a6"
        },
        {
          "url": "https://git.kernel.org/stable/c/8a5752c6dcc085a3bfc78589925182e4e98468c5"
        }
      ],
      "title": "dpaa2-switch: validate num_ifs to prevent out-of-bounds write",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43205",
    "datePublished": "2026-05-06T11:28:10.270Z",
    "dateReserved": "2026-05-01T14:12:55.992Z",
    "dateUpdated": "2026-05-11T22:20:00.994Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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