CVE-2025-39957

Hardware-scan denial via omitted S1G capability length

Published Oct 9, 2025 · Updated Oct 9, 2025

Denial of service in Linux mac80211 allows local users to stop S1G hardware scans by initiating an affected scan request. The scan_ies_len calculation omits the S1G capability element, so ieee80211_prep_hw_scan rejects the undersized buffer and __ieee80211_start_scan emits a warning. Reachability requires an S1G-capable wireless interface and a hardware scan; the failed validation prevents scanning rather than shutting down the system.

CVSS severity7.1
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux mac80211 allows local users to stop S1G hardware scans by initiating an affected scan request. The scan_ies_len calculation omits the S1G capability element, so ieee80211_prep_hw_scan rejects the undersized buffer and __ieee80211_start_scan emits a warning. Reachability requires an S1G-capable wireless interface and a hardware scan; the failed validation prevents scanning rather than shutting down the system.

The record

CVE
CVE-2025-39957
Published
Oct 9, 2025
Updated
Oct 9, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 9, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0dbad5f5549e54ac269cc04ce89f212892a98cab
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <16c9244a62116fe148f6961753b68e7160799f97
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <32adb020b0c32939da1322dcc87fc0ae2bc935d1
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7e2f3213e85eba00acb4cfe6d71647892d63c3a1
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <93e063f15e17acb8cd6ac90c8f0802c2624e1a74

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0dbad5f5549e54ac269cc04ce89f212892a98cab; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <16c9244a62116fe148f6961753b68e7160799f97; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <32adb020b0c32939da1322dcc87fc0ae2bc935d1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7e2f3213e85eba00acb4cfe6d71647892d63c3a1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <93e063f15e17acb8cd6ac90c8f0802c2624e1a74

Published CVSS scores

7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.1Linux kernel CVE teamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
3.3SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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