CVE-2026-68408

Local system hang via PMSR teardown deadlock

Published Aug 10, 2026 · Updated Aug 10, 2026

Deadlock in cfg80211 PMSR teardown in the Linux kernel allows local users to hang the system during concurrent interface shutdown. When cfg80211_pmsr_wdev_down() holds wiphy_lock, cancel_work_sync() waits for pmsr_free_wk while that worker waits to acquire the same lock. Reachability requires a user-owned PMSR netlink session to close as the interface tears down, leaving the affected kernel unable to proceed.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deadlock in cfg80211 PMSR teardown in the Linux kernel allows local users to hang the system during concurrent interface shutdown. When cfg80211_pmsr_wdev_down() holds wiphy_lock, cancel_work_sync() waits for pmsr_free_wk while that worker waits to acquire the same lock. Reachability requires a user-owned PMSR netlink session to close as the interface tears down, leaving the affected kernel unable to proceed.

The record

CVE
CVE-2026-68408
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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=28d3551f8d8cb3aec7497894d94150fe84d20e5e
  2. Affected versionversion=37e776e2e0a523731e2470dce6d563f0e8632a40
  3. Affected versionversion=6.1.167 <6.2
  4. Affected versionversion=6.12.78 <6.12.101
  5. Affected versionversion=6.18.20 <6.18.42
  6. Affected versionversion=6.19.10 <6.20
  7. Affected versionversion=6.6.130 <6.7
  8. Affected versionversion=6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09 <0a77d9fb4d5c0e01306cd406ffdee8f1fe955c0e
  9. Affected versionversion=6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09 <2b0eab425e1f658d8fe1df7590e3b9af5959505e
  10. Affected versionversion=7.0
  11. Affected versionversion=72b7ea786b8e570ae11149e9089859a4a8634a13
  12. Affected versionversion=a1b7a843f12a0c3e9d3a2ca607ce451916ef42cf <133684982dd0c24359fcc641d19d89cc17d6e5ef
  13. Affected versionversion=d32c07ef1880fe20cf4ab223dbfedc9c0b2816aa <21512b5f7a74fd18c996c22e6854efe57d570816

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=28d3551f8d8cb3aec7497894d94150fe84d20e5e; version=37e776e2e0a523731e2470dce6d563f0e8632a40; version=6.1.167 <6.2; version=6.12.78 <6.12.101; version=6.18.20 <6.18.42; version=6.19.10 <6.20; version=6.6.130 <6.7; version=6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09 <0a77d9fb4d5c0e01306cd406ffdee8f1fe955c0e; version=6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09 <2b0eab425e1f658d8fe1df7590e3b9af5959505e; version=7.0; version=72b7ea786b8e570ae11149e9089859a4a8634a13; version=a1b7a843f12a0c3e9d3a2ca607ce451916ef42cf <133684982dd0c24359fcc641d19d89cc17d6e5ef; version=d32c07ef1880fe20cf4ab223dbfedc9c0b2816aa <21512b5f7a74fd18c996c22e6854efe57d570816

Published CVSS scores

5.5Oracle LinuxCVSS: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

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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.

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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