CVE-2026-31779 (GCVE-0-2026-31779)
Vulnerability from cvelistv5
Published
2026-05-01 14:15
Modified
2026-08-05 12:25
Severity ?
8.1 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: iwlwifi: mvm: fix potential out-of-bounds read in iwl_mvm_nd_match_info_handler() The memcpy function assumes the dynamic array notif->matches is at least as large as the number of bytes to copy. Otherwise, results->matches may contain unwanted data. To guarantee safety, extend the validation in one of the checks to ensure sufficient packet length. Found by Linux Verification Center (linuxtesting.org) with SVACE.
References
Impacted products
Vendor Product Version
Linux Linux Version: 5ac54afd4d97ad8d94fe250c83b1924eb6d2268c
Version: 5ac54afd4d97ad8d94fe250c83b1924eb6d2268c
Version: 5ac54afd4d97ad8d94fe250c83b1924eb6d2268c
Version: 5ac54afd4d97ad8d94fe250c83b1924eb6d2268c
Version: 5ac54afd4d97ad8d94fe250c83b1924eb6d2268c
Version: 5ac54afd4d97ad8d94fe250c83b1924eb6d2268c
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/intel/iwlwifi/mvm/d3.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/intel/iwlwifi/mvm/d3.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.1"
            },
            {
              "lessThan": "6.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.168",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.134",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.81",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.22",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.168",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.134",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.81",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.22",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.12",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: iwlwifi: mvm: fix potential out-of-bounds read in iwl_mvm_nd_match_info_handler()\n\nThe memcpy function assumes the dynamic array notif-\u003ematches is at least\nas large as the number of bytes to copy. Otherwise, results-\u003ematches may\ncontain unwanted data. To guarantee safety, extend the validation in one\nof the checks to ensure sufficient packet length.\n\nFound by Linux Verification Center (linuxtesting.org) with SVACE."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The vulnerable path is in the WiFi WoWLAN/net-detect resume flow, where adjacent wireless activity can cause firmware scan-match notifications. It is not Internet-routable and requires WiFi radio proximity.\nAC:L - Once WoWLAN net-detect is active, causing matching scan results is straightforward for an adjacent attacker with a spoofed AP/beacon. There is no race or timing requirement in the kernel handler itself.\nPR:N - An adjacent wireless attacker does not need local credentials on the target to transmit frames that cause net-detect wake processing. Any local privilege needed to configure WoWLAN is a deployment prerequisite, not attacker privilege in the highest reasonable scenario.\nUI:N - WoWLAN/net-detect processing occurs autonomously while the system is suspended and during resume. The attacker does not need a victim to open a file or perform an application-level action.\nS:U - The bug affects the Linux kernel driver handling its own device/firmware notification data. It does not cross into another security authority such as a VM host boundary.\nC:H - The flaw is an out-of-bounds read from the firmware notification buffer into saved net-detect results and is not limited to only a few bytes. Under the required high-severity rule, this supports high confidentiality impact.\nI:N - The vulnerable operation is a read and bounded copy into an appropriately sized destination buffer. I found no out-of-bounds write or direct primitive for modifying kernel data.\nA:H - The copied unintended bytes are later interpreted as match/channel metadata and can drive invalid kernel accesses while reporting net-detect results. A malformed notification can therefore plausibly cause an oops or kernel crash."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:25:07.828Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f6abac936a0dfd31d6c3e49205ec0ee75a8f887f"
        },
        {
          "url": "https://git.kernel.org/stable/c/ffbed27ba15ef80d1c622eeedbfef03e501ae134"
        },
        {
          "url": "https://git.kernel.org/stable/c/e67d8c626ace80b0fa2b48c8ec0a46b508c93442"
        },
        {
          "url": "https://git.kernel.org/stable/c/dd90880eb5ec5442b37eb2b95688f4a63f4883e3"
        },
        {
          "url": "https://git.kernel.org/stable/c/ca0e9491b98ca4c5b44204b0b3dd8062a3b5fba2"
        },
        {
          "url": "https://git.kernel.org/stable/c/744fabc338e87b95c4d1ff7c95bc8c0f834c6d99"
        }
      ],
      "title": "wifi: iwlwifi: mvm: fix potential out-of-bounds read in iwl_mvm_nd_match_info_handler()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31779",
    "datePublished": "2026-05-01T14:15:06.506Z",
    "dateReserved": "2026-03-09T15:48:24.140Z",
    "dateUpdated": "2026-08-05T12:25:07.828Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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