CVE-2026-64174

Service interruption via repeated profile continuation copy

Published Jul 19, 2026 · Updated Jul 19, 2026

Denial of service in the cfg80211 Wi-Fi subsystem of Linux Kernel allows physically proximate attackers to consume CPU via malicious beacons. The cfg80211_merge_profile() loop fails to advance its MBSSID and subelement cursors, so it repeatedly finds and copies the same continuation at growing offsets. Reception of a crafted Multi-BSSID beacon triggers up to about 2 ms of excess kernel processing per beacon, permitting repeated nearby transmissions to impair availability.

CVSS severity5.5
Medium
EPSS probability0.12%
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 the cfg80211 Wi-Fi subsystem of Linux Kernel allows physically proximate attackers to consume CPU via malicious beacons. The cfg80211_merge_profile() loop fails to advance its MBSSID and subelement cursors, so it repeatedly finds and copies the same continuation at growing offsets. Reception of a crafted Multi-BSSID beacon triggers up to about 2 ms of excess kernel processing per beacon, permitting repeated nearby transmissions to impair availability.

The record

CVE
CVE-2026-64174
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-835, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 2026Record 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=5.2
  2. Affected versionversion=fe806e4992c9047affd263bcc13b2c047029a726 <1343a480f84b80c1249133a90ef87f8751d65cbb
  3. Affected versionversion=fe806e4992c9047affd263bcc13b2c047029a726 <1ced0f5a851f9cae274545a42a06c459b7fd8881
  4. Affected versionversion=fe806e4992c9047affd263bcc13b2c047029a726 <5817e1e5205498a5df66eba2b34e817f4210fd0f
  5. Affected versionversion=fe806e4992c9047affd263bcc13b2c047029a726 <67915715fd3874057457363c87c63e18829527df
  6. Affected versionversion=fe806e4992c9047affd263bcc13b2c047029a726 <6cfae4914439878b8acb35c7e3b40096eeb2ad9c
  7. Affected versionversion=fe806e4992c9047affd263bcc13b2c047029a726 <7666dbb1bacc4ba522b96740cba7283d243d16e1
  8. Affected versionversion=fe806e4992c9047affd263bcc13b2c047029a726 <c0bc4c8bd556cbe036a5b9ed333c0aab9aadfcb8
  9. Affected versionversion=fe806e4992c9047affd263bcc13b2c047029a726 <cedbb608494ba1e7a5c6c56b7f1d3fd470094f28

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.2; version=fe806e4992c9047affd263bcc13b2c047029a726 <1343a480f84b80c1249133a90ef87f8751d65cbb; version=fe806e4992c9047affd263bcc13b2c047029a726 <1ced0f5a851f9cae274545a42a06c459b7fd8881; version=fe806e4992c9047affd263bcc13b2c047029a726 <5817e1e5205498a5df66eba2b34e817f4210fd0f; version=fe806e4992c9047affd263bcc13b2c047029a726 <67915715fd3874057457363c87c63e18829527df; version=fe806e4992c9047affd263bcc13b2c047029a726 <6cfae4914439878b8acb35c7e3b40096eeb2ad9c; version=fe806e4992c9047affd263bcc13b2c047029a726 <7666dbb1bacc4ba522b96740cba7283d243d16e1; version=fe806e4992c9047affd263bcc13b2c047029a726 <c0bc4c8bd556cbe036a5b9ed333c0aab9aadfcb8; version=fe806e4992c9047affd263bcc13b2c047029a726 <cedbb608494ba1e7a5c6c56b7f1d3fd470094f28

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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