CVE-2026-93149Hinoki check available

Kernel crash via racy stop-queue drain

Published Sep 17, 2026 · Updated Sep 17, 2026

Linux mac80211_hwsim has a queue-drain race that allows local users to crash the kernel while stopping a simulated radio. mac80211_hwsim_stop() checks data->pending for emptiness separately from dequeuing, so concurrent TX status handling removes the final frame and leaves a NULL skb passed to ieee80211_free_txskb(). Exposure requires the simulator to be active and stop processing to overlap TX status completion; the published Amazon Linux assessment requires high privileges and identifies availability-only impact.

CVSS severity4.1
Medium
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Linux mac80211_hwsim has a queue-drain race that allows local users to crash the kernel while stopping a simulated radio. mac80211_hwsim_stop() checks data->pending for emptiness separately from dequeuing, so concurrent TX status handling removes the final frame and leaves a NULL skb passed to ieee80211_free_txskb(). Exposure requires the simulator to be active and stop processing to overlap TX status completion; the published Amazon Linux assessment requires high privileges and identifies availability-only impact.

The record

CVE
CVE-2026-93149
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=5.10.47 <5.11
  2. Affected versionversion=5.12.14 <5.13
  3. Affected versionversion=5.13
  4. Affected versionversion=5.4.129 <5.5
  5. Affected versionversion=7019c9f385b264a2d6f685028268422d55087e37
  6. Affected versionversion=78bf3c6131488b00386acd9aff1ea4e6c44fa38e
  7. Affected versionversion=a9028333001f793b2724e8be42fce3336de2cf1c
  8. Affected versionversion=bd18de517923903a177508fc8813f44e717b1c00 <158438cd6ad69d6dd7d871582c38baf22169fede
  9. Affected versionversion=bd18de517923903a177508fc8813f44e717b1c00 <1c2a4ab6efa26415dd131b8c222e7893fda03435
  10. Affected versionversion=bd18de517923903a177508fc8813f44e717b1c00 <2817431a61557f46dc63077b7cc126bc906c242e
  11. Affected versionversion=bd18de517923903a177508fc8813f44e717b1c00 <c40ba47f2ba1951cb32ea048667ed014d36a5749
  12. Affected versionversion=bd18de517923903a177508fc8813f44e717b1c00 <d131027054a8dd922dda01fe8d381abe5af4970b
  13. Affected versionversion=bd18de517923903a177508fc8813f44e717b1c00 <e7fccad2c8e6ef6bbafe509c95869d161d0f466b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=5.10.47 <5.11; version=5.12.14 <5.13; version=5.13; version=5.4.129 <5.5; version=7019c9f385b264a2d6f685028268422d55087e37; version=78bf3c6131488b00386acd9aff1ea4e6c44fa38e; version=a9028333001f793b2724e8be42fce3336de2cf1c; version=bd18de517923903a177508fc8813f44e717b1c00 <158438cd6ad69d6dd7d871582c38baf22169fede; version=bd18de517923903a177508fc8813f44e717b1c00 <1c2a4ab6efa26415dd131b8c222e7893fda03435; version=bd18de517923903a177508fc8813f44e717b1c00 <2817431a61557f46dc63077b7cc126bc906c242e; version=bd18de517923903a177508fc8813f44e717b1c00 <c40ba47f2ba1951cb32ea048667ed014d36a5749; version=bd18de517923903a177508fc8813f44e717b1c00 <d131027054a8dd922dda01fe8d381abe5af4970b; version=bd18de517923903a177508fc8813f44e717b1c00 <e7fccad2c8e6ef6bbafe509c95869d161d0f466b

Published CVSS scores

5.1TenableCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C
4.9TenableAV:L/AC:L/Au:N/C:N/I:N/A:C
5.5TenableCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5TenableCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.1Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/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.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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