CVE-2025-39918 (GCVE-0-2025-39918)

Vulnerability from cvelistv5 – Published: 2025-10-01 07:55 – Updated: 2026-08-05 12:06
VLAI
Title
wifi: mt76: fix linked list corruption
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: fix linked list corruption Never leave scheduled wcid entries on the temporary on-stack list
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 17:43 UTC
CWE
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7067 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0b3be9d1d34e21dada69c539fbf51a5fe868028a , < e4d5a5fc61fdc65220a1ce078d24c1d20bbb0835 (git)
Affected: 0b3be9d1d34e21dada69c539fbf51a5fe868028a , < c91a59b04f928cb4a1436b0e0a27650883d0388a (git)
Affected: 0b3be9d1d34e21dada69c539fbf51a5fe868028a , < 49fba87205bec14a0f6bd997635bf3968408161e (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.12.46 , ≤ 6.12.* (semver)
Unaffected: 6.16.6 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/net/wireless/mediatek/mt76/tx.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "6.12"
                },
                {
                  "lessThan": "6.12",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.46",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.16.*",
                  "status": "unaffected",
                  "version": "6.16.6",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.17",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.46",
                      "versionStartIncluding": "6.12",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.16.6",
                      "versionStartIncluding": "6.12",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.17",
                      "versionStartIncluding": "6.12",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mt76: fix linked list corruption\n\nNever leave scheduled wcid entries on the temporary on-stack list"
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 8.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:A - The vulnerable code is the mt76 802.11 TX scheduler, driven entirely by wireless traffic; an attacker within radio range saturates the hardware TX ring (flooding probe/auth requests an AP must answer, or bulk traffic) and controls station add/remove via association and injected deauth frames. This is same-WLAN-segment reachability, matching the standard Adjacent classification for WiFi driver bugs.\nAC:L - Both required conditions are directly attacker-controlled \u2014 TX-ring saturation is produced by the attacker\u0027s own traffic flood (or by forcing a scan/channel change that sets MT76_RESET), and multiple queued wcids are the normal state of a multi-station AP. Slab grooming for the follow-on UAF write is likewise driven by attacker-timed association/disassociation, so no condition lies outside the attacker\u0027s influence.\nPR:N - No credentials on the target kernel are needed: unassociated frame injection (probe/auth request floods eliciting responses, deauth frames forcing station teardown) drives both the TX-ring saturation and the mt76_wcid_cleanup() path that dereferences the corrupted list, and an attacker on an open or guest WLAN holds no privilege on the AP either.\nUI:N - The corruption occurs inside the driver\u0027s tx worker and station-removal paths in response to attacker-generated frames alone. No action by any local user or administrator is required.\nS:U - The corrupted list heads and the resulting writes are all within the kernel\u0027s own memory and security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The dangling list nodes are traversed and dereferenced through stale on-stack pointers and through freed, reallocated mt76 station slab objects, and the resulting `list_del` write primitive can be leveraged to disclose kernel memory. Per the use-after-free / memory-corruption guidance this rates High.\nI:H - `list_del_init()` on an orphaned entry performs `next-\u003eprev = prev` / `prev-\u003enext = next`, writing kernel pointers into a stack frame already reused by another task and, after the neighbouring wcid is freed, into an attacker-groomable reallocated slab object \u2014 a controllable kernel write primitive suitable for control-flow hijacking.\nA:H - The bug permanently wedges TX for every orphaned station (their frames are never re-scheduled), and the cross-linked stale and live lists produce cycles that spin `while (!list_empty(\u0026tx_list))` forever under local_bh_disable() with phy-\u003etx_lock held, hanging the system; with CONFIG_DEBUG_LIST it is an immediate list-corruption BUG/oops."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T12:06:03.017Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/e4d5a5fc61fdc65220a1ce078d24c1d20bbb0835"
            },
            {
              "url": "https://git.kernel.org/stable/c/c91a59b04f928cb4a1436b0e0a27650883d0388a"
            },
            {
              "url": "https://git.kernel.org/stable/c/49fba87205bec14a0f6bd997635bf3968408161e"
            }
          ],
          "title": "wifi: mt76: fix linked list corruption",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2025-39918",
        "datePublished": "2025-10-01T07:55:13.851Z",
        "dateReserved": "2025-04-16T07:20:57.147Z",
        "dateUpdated": "2026-08-05T12:06:03.017Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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