GHSA-V2HQ-M36P-4JR3

Vulnerability from github – Published: 2026-05-06 12:30 – Updated: 2026-05-11 21:31
VLAI?
Details

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] |= ...

Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-43205"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-787"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-06T12:16:39Z",
    "severity": "HIGH"
  },
  "details": "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] |= ...",
  "id": "GHSA-v2hq-m36p-4jr3",
  "modified": "2026-05-11T21:31:30Z",
  "published": "2026-05-06T12:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43205"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/89764cf44544e943230f5e03b8c40a90da26537c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8a5752c6dcc085a3bfc78589925182e4e98468c5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8b841fd529db9faf8bc678d429d4bf4e98b10900"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a26dda3bae469c8e4e1b1993ad33dafa32d0fc28"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a3034a8d56174dd6464c46823438f25797910a8d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b690635d4719214892855b79ce018d4b1672ac96"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c18493f750208eb4ff1198fc5a02786b8b2d70a6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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