Linux Kernel up to 6.18.39/7.1.4 Ete coresight-core.c coresight_disclaim_device_unlocked state issue

CVSS Meta Temp Score
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CTI Interest Score
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9.5$5k-$25k0.65+

Summaryinfo

A vulnerability categorized as very critical has been discovered in Linux Kernel up to 6.18.39/7.1.4. Impacted is the function coresight_disclaim_device_unlocked of the file drivers/hwtracing/coresight/coresight-core.c of the component Ete. Executing a manipulation can lead to state issue. The identification of this vulnerability is CVE-2026-80623. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.18.39/7.1.4 and classified as very critical. This vulnerability affects the function coresight_disclaim_device_unlocked of the file drivers/hwtracing/coresight/coresight-core.c of the component Ete. The manipulation with an unknown input leads to a state issue vulnerability. The CWE definition for the vulnerability is CWE-371. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: coresight: ete: Always save state on power down System register ETMs and ETE are unlikely to be preserved on CPU power down. The ETE DT binding also never documented "arm,coresight-loses-context-with-cpu" so nobody would have legitimately been able to use that binding to fix it and ACPI has no such binding at all. Fix it by hard coding the setting for sysreg ETMs (ETE is always sysreg) or ACPI boots. Use a local variable when setting up save_state so that it's immune to concurrent probing when devices have different configurations which is an issue with modifying the global. This fixes the following error when using Coresight with ACPI on the FVP which supports CPU PM: coresight ete0: External agent took claim tag WARNING: drivers/hwtracing/coresight/coresight-core.c:248 at coresight_disclaim_device_unlocked+0xe0/0xe8, CPU#0: perf/117

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-80623 since 08/26/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 08/28/2026).

Upgrading to version 6.18.40 or 7.1.5 eliminates this vulnerability. Applying the patch 65d87f28daec31903fc39fee0744f7a0059c19f2/293dacd5b6a9f1275d92ca6c4fd874e54b2c8319/2ab4645fe4206c142a5f1491e191c906279686cf is able to eliminate this problem.

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Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.5

VulDB Base Score: 9.9
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: State issue
CWE: CWE-371
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.40/7.1.5
Patch: 65d87f28daec31903fc39fee0744f7a0059c19f2/293dacd5b6a9f1275d92ca6c4fd874e54b2c8319/2ab4645fe4206c142a5f1491e191c906279686cf

Timelineinfo

08/26/2026 CVE reserved
08/28/2026 +2 days Advisory disclosed
08/28/2026 +0 days VulDB entry created
08/28/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-80623 (🔒)
GCVE (CVE): GCVE-0-2026-80623
GCVE (VulDB): GCVE-100-396544

Entryinfo

Created: 08/28/2026 10:08
Changes: 08/28/2026 10:08 (60)
Complete: 🔍
Cache ID: 216::103

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