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Linux Kernel EUVDEUVD-2026-67498

| CVE-2026-80622 HIGH
2026-08-28 Linux GHSA-hhvf-97x6-wjfh
Information Disclosure Linux Red Hat Suse
7.8
CVSS 3.1 · Vendor: Linux
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Severity by source

Vendor (Linux) PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.0 HIGH

AC:H reflects the race condition timing requirement during concurrent module unload; PR:L required to open the character device; no scope change.

3.1 AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
5.5 MEDIUM
qualitative

Primary rating from Vendor (Linux).

CVSS VectorVendor: Linux

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Analysis Generated
Aug 29, 2026 - 07:36 vuln.today
CVSS changed
Aug 29, 2026 - 07:22 NVD
7.8 (HIGH)
Patch available
Aug 28, 2026 - 09:02 EUVD
CVE Published
Aug 28, 2026 - 06:48 cve.org
UNKNOWN (no severity yet)
CVE Published
Aug 28, 2026 - 06:48 cve.org
HIGH 7.8

DescriptionCVE.org

In the Linux kernel, the following vulnerability has been resolved:

char: tlclk: fix use-after-free in tlclk_cleanup()

This patch improves the module cleanup process in the tlclk driver to prevent potential use-after-free and race conditions.

Currently, the file_operations structure does not specify the .owner field, which could allow the module to be unloaded while user-space processes are still interacting with the device. Additionally, the tlclk_cleanup() function frees the alarm_events memory before ensuring that blocked processes in the waitqueue are fully awakened and that the switchover_timer has completed.

To address these cases, this patch:

  • Sets '.owner = THIS_MODULE' in tlclk_fops to safely defer module

unloading while the device is in use.

  • Updates tlclk_cleanup() to explicitly wake up all blocked readers

(wake_up_all), properly release hardware I/O regions, and safely delete the timer (timer_delete_sync) prior to freeing memory.

AnalysisAI

Use-after-free and race condition vulnerabilities in the Linux kernel's tlclk (Telecom Clock) character driver expose local low-privileged users to potential kernel-space memory corruption, privilege escalation, or system crash. The module cleanup function tlclk_cleanup() frees alarm_events memory before awakening blocked waitqueue readers and before the switchover_timer completes, creating a use-after-free window during concurrent module unload. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires all of the following: (1) the tlclk kernel module must be loaded, which only occurs on systems physically equipped with telecom clock hardware or where the module is manually force-loaded; (2) the attacker must have local system access with sufficient permission to open the tlclk character device node; (3) a concurrent module unload event (rmmod by a privileged user, or system shutdown) must occur while the attacker's process is blocked in a read() on the device. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The NVD CVSS of 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) assigns High severity with local attack vector and low-complexity, which partially overstates ease of exploitation - the underlying race condition requires precise timing between a blocked userspace read and a concurrent module unload, implying real-world complexity closer to AC:H. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade to a patched stable kernel release: 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5, or 7.2 as appropriate for the deployed branch. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify systems with the Linux tlclk driver active and document their current kernel versions. …

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 16.0 Affected

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EUVD-2026-67498 vulnerability details – vuln.today
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