CVE-2026-80622Hinoki check available

Kernel use-after-free via premature tlclk cleanup

Published Aug 28, 2026 · Updated Aug 28, 2026

Use-after-free in the tlclk driver in affected Linux kernels allows attackers to trigger stale-memory access during module removal. The tlclk_cleanup() path frees alarm_events before blocked readers are fully awakened and before the switchover timer is synchronously deleted, while tlclk_fops lacks an owner reference that prevents unloading during use. Reachability requires tlclk hardware, an open device reader, and concurrent privileged module unload; published material does not establish a crash, memory corruption, or code execution consequence.

CVSS severityUnavailable
Unscored
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Use-after-free in the tlclk driver in affected Linux kernels allows attackers to trigger stale-memory access during module removal. The tlclk_cleanup() path frees alarm_events before blocked readers are fully awakened and before the switchover timer is synchronously deleted, while tlclk_fops lacks an owner reference that prevents unloading during use. Reachability requires tlclk hardware, an open device reader, and concurrent privileged module unload; published material does not establish a crash, memory corruption, or code execution consequence.

The record

CVE
CVE-2026-80622
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 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=1a80ba88273097933f93b1f40537337416798c70 <09d8d2a46a9ec9ff728f3159a174a2ab25dd0f0a
  2. Affected versionversion=1a80ba88273097933f93b1f40537337416798c70 <166dd1d5265e067459e674c11688919901813ec2
  3. Affected versionversion=1a80ba88273097933f93b1f40537337416798c70 <3d5e4cc0d9dce79b0429da3134ac7b072ab9009f
  4. Affected versionversion=1a80ba88273097933f93b1f40537337416798c70 <42223445607a9a5df3cb1c4729abfe3a5085e7ce
  5. Affected versionversion=1a80ba88273097933f93b1f40537337416798c70 <764723bd67a6c8f53a8d8309211fb039e2ebcf49
  6. Affected versionversion=1a80ba88273097933f93b1f40537337416798c70 <96902299a22d126ef5eb3f45cd5d8ceea9e6a735
  7. Affected versionversion=1a80ba88273097933f93b1f40537337416798c70 <bbf003b7794d6ad6f939fdd29f1f1bde8ac554c1
  8. Affected versionversion=1a80ba88273097933f93b1f40537337416798c70 <c3f0cd76561ae611c2d247ee96dfd559e4197cb7
  9. Affected versionversion=2.6.15

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=1a80ba88273097933f93b1f40537337416798c70 <09d8d2a46a9ec9ff728f3159a174a2ab25dd0f0a; version=1a80ba88273097933f93b1f40537337416798c70 <166dd1d5265e067459e674c11688919901813ec2; version=1a80ba88273097933f93b1f40537337416798c70 <3d5e4cc0d9dce79b0429da3134ac7b072ab9009f; version=1a80ba88273097933f93b1f40537337416798c70 <42223445607a9a5df3cb1c4729abfe3a5085e7ce; version=1a80ba88273097933f93b1f40537337416798c70 <764723bd67a6c8f53a8d8309211fb039e2ebcf49; version=1a80ba88273097933f93b1f40537337416798c70 <96902299a22d126ef5eb3f45cd5d8ceea9e6a735; version=1a80ba88273097933f93b1f40537337416798c70 <bbf003b7794d6ad6f939fdd29f1f1bde8ac554c1; version=1a80ba88273097933f93b1f40537337416798c70 <c3f0cd76561ae611c2d247ee96dfd559e4197cb7; version=2.6.15

Published CVSS scores

No CVSS assessment is available in this record.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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