CVE-2026-64325 (GCVE-0-2026-64325)
Vulnerability from cvelistv5
Published
2026-07-25 08:49
Modified
2026-08-17 04:53
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7921/mt7925: fix NULL dereference in CSA beacon This patch is based on a BUG as reported by Bongani Hlope at https://lore.kernel.org/all/20260502125824.425d7159@bongani-mini.home.org.za/ When a channel-switch announcement (CSA) beacon is received, cfg80211 queues a wiphy work item that eventually calls mt7921_channel_switch_rx_beacon(). If the station disconnects (or the channel context is otherwise torn down) between the time the work is queued and the time it runs, the driver's dev->new_ctx pointer can already have been cleared to NULL. mt7921_channel_switch_rx_beacon() then dereferences new_ctx unconditionally, triggering a NULL pointer dereference at address 0x0: BUG: kernel NULL pointer dereference, address: 0000000000000000 RIP: 0010:mt7921_channel_switch_rx_beacon+0x1f/0x100 [mt7921_common] The same missing guard exists in mt7925_channel_switch_rx_beacon(), which shares the same code pattern introduced by the same commit. Add an early-return NULL check for dev->new_ctx in both mt7921_channel_switch_rx_beacon() and mt7925_channel_switch_rx_beacon(). When new_ctx is NULL there is no pending channel switch to process, so returning immediately is the correct and safe action. Oops-Analysis: http://oops.fenrus.org/reports/lkml/20260502125824.425d7159@bongani-mini.home.org.za/report.html
References
Impacted products
Vendor Product Version
Linux Linux Version: 8aa2f59260eb66fc80378c158922ccb741ccc491
Version: 8aa2f59260eb66fc80378c158922ccb741ccc491
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/mediatek/mt76/mt7921/main.c",
            "drivers/net/wireless/mediatek/mt76/mt7925/main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "77e7b127472a191e086e1e0b1b051703f33b1801",
              "status": "affected",
              "version": "8aa2f59260eb66fc80378c158922ccb741ccc491",
              "versionType": "git"
            },
            {
              "lessThan": "351dd7d2c80d23e56dcce6faa4e62bea5b0877c7",
              "status": "affected",
              "version": "8aa2f59260eb66fc80378c158922ccb741ccc491",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/mediatek/mt76/mt7921/main.c",
            "drivers/net/wireless/mediatek/mt76/mt7925/main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.4",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mt76: mt7921/mt7925: fix NULL dereference in CSA beacon\n\nThis patch is based on a BUG as reported by Bongani Hlope at\nhttps://lore.kernel.org/all/20260502125824.425d7159@bongani-mini.home.org.za/\n\nWhen a channel-switch announcement (CSA) beacon is received,\ncfg80211 queues a wiphy work item that eventually calls\nmt7921_channel_switch_rx_beacon(). If the station disconnects\n(or the channel context is otherwise torn down) between the\ntime the work is queued and the time it runs, the driver\u0027s\ndev-\u003enew_ctx pointer can already have been cleared to NULL.\nmt7921_channel_switch_rx_beacon() then dereferences new_ctx\nunconditionally, triggering a NULL pointer dereference at\naddress 0x0:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000000\n  RIP: 0010:mt7921_channel_switch_rx_beacon+0x1f/0x100 [mt7921_common]\n\nThe same missing guard exists in mt7925_channel_switch_rx_beacon(),\nwhich shares the same code pattern introduced by the same commit.\n\nAdd an early-return NULL check for dev-\u003enew_ctx in both\nmt7921_channel_switch_rx_beacon() and\nmt7925_channel_switch_rx_beacon(). When new_ctx is NULL there is\nno pending channel switch to process, so returning immediately is\nthe correct and safe action.\n\nOops-Analysis: http://oops.fenrus.org/reports/lkml/20260502125824.425d7159@bongani-mini.home.org.za/report.html"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:53:27.211Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/77e7b127472a191e086e1e0b1b051703f33b1801"
        },
        {
          "url": "https://git.kernel.org/stable/c/351dd7d2c80d23e56dcce6faa4e62bea5b0877c7"
        }
      ],
      "title": "wifi: mt76: mt7921/mt7925: fix NULL dereference in CSA beacon",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64325",
    "datePublished": "2026-07-25T08:49:53.238Z",
    "dateReserved": "2026-07-19T15:36:31.780Z",
    "dateUpdated": "2026-08-17T04:53:27.211Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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