{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/mediatek/mt76/channel.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c7a83899203ed36696a2d35ddd03c0f522874a63",
              "status": "affected",
              "version": "a8f424c1287cc79a06c21816658feea87dfcb83f",
              "versionType": "git"
            },
            {
              "lessThan": "50e700ac0edce72dee5c3a9755865d9423696ac7",
              "status": "affected",
              "version": "a8f424c1287cc79a06c21816658feea87dfcb83f",
              "versionType": "git"
            },
            {
              "lessThan": "7fae097aa9a56c30febf539d72ef3773165d3aa3",
              "status": "affected",
              "version": "a8f424c1287cc79a06c21816658feea87dfcb83f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/mediatek/mt76/channel.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": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "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": "6.18.40",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "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: use kfree_rcu for offchannel link in mt76_put_vif_phy_link\n\nmt76_put_vif_phy_link() frees the offchannel mlink with plain kfree()\nafter rcu_assign_pointer(NULL). However, rcu_assign_pointer only prevents\nfuture RCU readers from obtaining the pointer -- it does not wait for\nexisting readers that already hold it via rcu_dereference.\n\nThe TX datapath (e.g. mt7996_mac_write_txwi) dereferences mlink-\u003ewcid\nand mlink-\u003eidx under rcu_read_lock. If a TX softirq obtained the pointer\nvia rcu_dereference just before the NULL assignment, it will dereference\nfreed memory after the kfree.\n\nstruct mt76_vif_link already contains an rcu_head field that is unused at\nthis free site -- a developer oversight, since the adjacent\nkfree_rcu_mightsleep call for rx_sc in the same function shows the\npattern was understood.\n\nReplace kfree(mlink) with kfree_rcu(mlink, rcu_head)."
        }
      ],
      "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 - The bug is reached only through local nl80211/genl paths (NL80211_CMD_REMAIN_ON_CHANNEL, CANCEL_REMAIN_ON_CHANNEL, TRIGGER_SCAN) that call mt76_put_vif_phy_link during ROC/scan teardown; remote WiFi frames cannot invoke this free path.\nAC:L - Exploitation is a race between ROC/scan completion freeing the offchannel mlink and the TX datapath still dereferencing it under RCU; an attacker with nl80211 access controls both sides by starting offchannel ops, queuing offchannel TX, and cancelling ROC concurrently.\nPR:L - Entry points require GENL_UNS_ADMIN_PERM (CAP_NET_ADMIN in the socket user namespace). Per CNA guidance this is Low because unprivileged users can obtain CAP_NET_ADMIN via user namespaces and drive ROC/scan on an mt76 multi-radio interface they control.\nUI:N - No victim interaction is required once the attacker can issue nl80211 ROC/scan commands and offchannel TX; exploitation does not depend on a user opening files, mounting filesystems, or clicking prompts.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same OS security boundary; it does not cross VM, container, or IOMMU isolation boundaries on its own.\nC:H - This is a use-after-free of struct mt76_vif_link freed via kfree while TX paths such as mt7996_mac_write_txwi still rcu_dereference and read mlink fields; UAF enables heap grooming for arbitrary kernel memory disclosure.\nI:H - Freed mlink contents control TXWI fields (omac_idx, wmm_idx, band_idx, bss idx) passed to firmware DMA descriptors; UAF provides a practical path to corrupt kernel heap metadata and achieve arbitrary code execution.\nA:H - Dereferencing the freed offchannel_link in the TX worker/softirq path causes kernel oops or panic; UAF on a hot transmit path can crash multi-radio mt76 APs, routers, and client devices during P2P/scan offchannel operations."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:45:54.629Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c7a83899203ed36696a2d35ddd03c0f522874a63"
        },
        {
          "url": "https://git.kernel.org/stable/c/50e700ac0edce72dee5c3a9755865d9423696ac7"
        },
        {
          "url": "https://git.kernel.org/stable/c/7fae097aa9a56c30febf539d72ef3773165d3aa3"
        }
      ],
      "title": "wifi: mt76: use kfree_rcu for offchannel link in mt76_put_vif_phy_link",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74325",
    "datePublished": "2026-08-15T05:58:20.236Z",
    "dateReserved": "2026-08-15T05:44:03.884Z",
    "dateUpdated": "2026-08-17T05:45:54.629Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}