GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2025-39957 (GCVE-0-2025-39957)

Vulnerability from cvelistv5 – Published: 2025-10-09 09:47 – Updated: 2026-08-05 12:06
VLAI
Title
wifi: mac80211: increase scan_ies_len for S1G
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: increase scan_ies_len for S1G Currently the S1G capability element is not taken into account for the scan_ies_len, which leads to a buffer length validation failure in ieee80211_prep_hw_scan() and subsequent WARN in __ieee80211_start_scan(). This prevents hw scanning from functioning. To fix ensure we accommodate for the S1G capability length.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0333a81bc83431d7f90391d38aa09e856c5e5b25 , < 93e063f15e17acb8cd6ac90c8f0802c2624e1a74 (git)
Affected: 0333a81bc83431d7f90391d38aa09e856c5e5b25 , < 32adb020b0c32939da1322dcc87fc0ae2bc935d1 (git)
Affected: 0333a81bc83431d7f90391d38aa09e856c5e5b25 , < 0dbad5f5549e54ac269cc04ce89f212892a98cab (git)
Affected: 0333a81bc83431d7f90391d38aa09e856c5e5b25 , < 7e2f3213e85eba00acb4cfe6d71647892d63c3a1 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.6.108 , ≤ 6.6.* (semver)
Unaffected: 6.12.49 , ≤ 6.12.* (semver)
Unaffected: 6.16.9 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mac80211/main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "93e063f15e17acb8cd6ac90c8f0802c2624e1a74",
              "status": "affected",
              "version": "0333a81bc83431d7f90391d38aa09e856c5e5b25",
              "versionType": "git"
            },
            {
              "lessThan": "32adb020b0c32939da1322dcc87fc0ae2bc935d1",
              "status": "affected",
              "version": "0333a81bc83431d7f90391d38aa09e856c5e5b25",
              "versionType": "git"
            },
            {
              "lessThan": "0dbad5f5549e54ac269cc04ce89f212892a98cab",
              "status": "affected",
              "version": "0333a81bc83431d7f90391d38aa09e856c5e5b25",
              "versionType": "git"
            },
            {
              "lessThan": "7e2f3213e85eba00acb4cfe6d71647892d63c3a1",
              "status": "affected",
              "version": "0333a81bc83431d7f90391d38aa09e856c5e5b25",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/mac80211/main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
              "lessThan": "6.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.108",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.49",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.9",
              "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": "6.6.108",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.49",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.9",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The failure is reached by initiating a scan on the local host \u2014 `nl80211_trigger_scan` over netlink (or an internal mac80211/mlme scan) \u2014 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-\u003euser_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 \u2014 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\u0027s 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-\u003eie_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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:06:27.822Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39957",
    "datePublished": "2025-10-09T09:47:34.933Z",
    "dateReserved": "2025-04-16T07:20:57.149Z",
    "dateUpdated": "2026-08-05T12:06:27.822Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-39957",
      "date": "2026-09-16",
      "epss": "0.00154",
      "percentile": "0.04901"
    },
    "microsoft_vex": {
      "current_release_date": "2025-10-10T01:02:23.000Z",
      "cve": "CVE-2025-39957",
      "id": "msrc_CVE-2025-39957",
      "initial_release_date": "2025-10-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "wifi: mac80211: increase scan_ies_len for S1G",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-39957.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39957\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-09T10:15:37.133\",\"lastModified\":\"2026-07-30T06:24:00.870\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/mac80211/main.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"0333a81bc83431d7f90391d38aa09e856c5e5b25\",\"lessThan\":\"93e063f15e17acb8cd6ac90c8f0802c2624e1a74\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0333a81bc83431d7f90391d38aa09e856c5e5b25\",\"lessThan\":\"32adb020b0c32939da1322dcc87fc0ae2bc935d1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0333a81bc83431d7f90391d38aa09e856c5e5b25\",\"lessThan\":\"0dbad5f5549e54ac269cc04ce89f212892a98cab\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0333a81bc83431d7f90391d38aa09e856c5e5b25\",\"lessThan\":\"7e2f3213e85eba00acb4cfe6d71647892d63c3a1\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/mac80211/main.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.4\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.4\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.108\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.49\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.16.9\",\"lessThanOrEqual\":\"6.16.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.17\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.4\",\"versionEndExcluding\":\"6.6.108\",\"matchCriteriaId\":\"D56D8BF0-6D05-4B36-BAB4-759F12521CF6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.49\",\"matchCriteriaId\":\"CAA033E9-A2C5-4976-A83E-9804D8FB827F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.16.9\",\"matchCriteriaId\":\"638DD910-1189-4F5E-98BF-2D436B695112\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"327D22EF-390B-454C-BD31-2ED23C998A1C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"C730CD9A-D969-4A8E-9522-162AAF7C0EE9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"39982C4B-716E-4B2F-8196-FA301F47807D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"340BEEA9-D70D-4290-B502-FBB1032353B1\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0dbad5f5549e54ac269cc04ce89f212892a98cab\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/32adb020b0c32939da1322dcc87fc0ae2bc935d1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7e2f3213e85eba00acb4cfe6d71647892d63c3a1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/93e063f15e17acb8cd6ac90c8f0802c2624e1a74\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-13T18:08:59+00:00",
      "cve": "CVE-2025-39957",
      "id": "CVE-2025-39957",
      "initial_release_date": "2025-10-09T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: wifi: mac80211: increase scan_ies_len for S1G",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39957.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-08-30T01:50:10Z",
      "cve": "CVE-2025-39957",
      "id": "CVE-2025-39957",
      "initial_release_date": "2025-10-09T23:23:10Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "712",
      "product_status:known_not_affected": "87",
      "product_status:recommended": "464",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-39957",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-39957.json",
      "version": "40"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.