{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-39957", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.149Z", "datePublished": "2025-10-09T09:47:34.933Z", "dateUpdated": "2026-08-05T12:06:27.822Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:06:27.822Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: increase scan_ies_len for S1G\n\nCurrently the S1G capability element is not taken into account\nfor the scan_ies_len, which leads to a buffer length validation\nfailure in ieee80211_prep_hw_scan() and subsequent WARN in\n__ieee80211_start_scan(). This prevents hw scanning from functioning.\nTo fix ensure we accommodate for the S1G capability length." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The failure is reached by initiating a scan on the local host — `nl80211_trigger_scan` over netlink (or an internal mac80211/mlme scan) — not by processing any received frame. No remote or adjacent peer input is involved in triggering the undersized-buffer condition.\nAC:L - The miscalculation is deterministic: on any S1G-capable hardware doing a hardware scan, `ieee80211_build_preq_ies()` always overruns the `scan_ies_len` budget and fails, firing the WARN and passing an uninitialized request to the driver every single time. No race, timing, or memory-layout condition is required.\nPR:L - `NL80211_CMD_TRIGGER_SCAN` is gated by `GENL_UNS_ADMIN_PERM`, i.e. `ns_capable(net->user_ns, CAP_NET_ADMIN)`, which is the user-namespace-aware check and therefore reachable by a low-privileged local user rather than requiring real root; in practice scans are also driven continuously by wpa_supplicant/NetworkManager on behalf of ordinary desktop users.\nUI:N - No victim action is needed — a scan request alone triggers the path, and on affected hardware normal automatic scanning at boot or after connection loss hits it with no user involvement at all.\nS:U - The uninitialized-value use and the WARN both occur within the kernel's own security authority in net/mac80211 and the wireless driver; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Because `ieee80211_prep_hw_scan()` returns before assigning `req.ie_len`/`req.mac_addr`/`req.mac_addr_mask` yet `__ieee80211_start_scan()` still calls `drv_hw_scan()`, drivers copy `req->ie_len` bytes (uninitialized kmalloc heap value, effectively unbounded) out of the IE buffer into a probe request that is transmitted over the air, disclosing arbitrary adjacent kernel heap memory.\nI:N - All IE emission is bounds-checked via `skb_tailroom()`/`end - pos` guards, so no out-of-bounds write or kernel data modification occurs; the uninitialized length yields only reads.\nA:H - `WARN_ON(!ieee80211_prep_hw_scan())` fires on every scan attempt, which is a kernel panic on the many hardened/embedded builds running `panic_on_warn`, and the subsequent unbounded read driven by the uninitialized `ie_len` can fault or trigger an enormous allocation; hardware scanning is rendered permanently non-functional." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/mac80211/main.c" ], "versions": [ { "version": "0333a81bc83431d7f90391d38aa09e856c5e5b25", "lessThan": "93e063f15e17acb8cd6ac90c8f0802c2624e1a74", "status": "affected", "versionType": "git" }, { "version": "0333a81bc83431d7f90391d38aa09e856c5e5b25", "lessThan": "32adb020b0c32939da1322dcc87fc0ae2bc935d1", "status": "affected", "versionType": "git" }, { "version": "0333a81bc83431d7f90391d38aa09e856c5e5b25", "lessThan": "0dbad5f5549e54ac269cc04ce89f212892a98cab", "status": "affected", "versionType": "git" }, { "version": "0333a81bc83431d7f90391d38aa09e856c5e5b25", "lessThan": "7e2f3213e85eba00acb4cfe6d71647892d63c3a1", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/mac80211/main.c" ], "versions": [ { "version": "6.4", "status": "affected" }, { "version": "0", "lessThan": "6.4", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.108", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.49", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.16.9", "lessThanOrEqual": "6.16.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.17", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.6.108" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.12.49" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.16.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.17" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/93e063f15e17acb8cd6ac90c8f0802c2624e1a74" }, { "url": "https://git.kernel.org/stable/c/32adb020b0c32939da1322dcc87fc0ae2bc935d1" }, { "url": "https://git.kernel.org/stable/c/0dbad5f5549e54ac269cc04ce89f212892a98cab" }, { "url": "https://git.kernel.org/stable/c/7e2f3213e85eba00acb4cfe6d71647892d63c3a1" } ], "title": "wifi: mac80211: increase scan_ies_len for S1G", "x_generator": { "engine": "bippy-1.2.0" } } } }