Linux Kernel up to 6.6.156/6.12.109/6.18.51/7.2.5 arm_scmi scmi_cleanup_channels memory corruption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.4$0-$5k0.00

Summaryinfo

A vulnerability identified as very critical has been detected in Linux Kernel up to 6.6.156/6.12.109/6.18.51/7.2.5. Affected is the function scmi_cleanup_channels of the component arm_scmi. The manipulation leads to memory corruption. This vulnerability is uniquely identified as CVE-2026-93086. Local access is required to approach this attack. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.6.156/6.12.109/6.18.51/7.2.5. It has been rated as very critical. This issue affects the function scmi_cleanup_channels of the component arm_scmi. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Avoid IDR updates while cleaning channels scmi_cleanup_channels() walks the TX/RX channel IDRs with idr_for_each() to free transport resources and destroy the dedicated transport devices before calling idr_destroy(). The destroy callback removed each entry from the same IDR being walked. That is not needed for this cleanup path, and it is unsafe because idr_for_each() has not advanced its radix-tree iterator while the callback is running. Removing the current entry from the callback can invalidate the iterator state. The callback also cannot be protected by rcu_read_lock(), because scmi_device_destroy() may sleep. Leave IDR teardown to the following idr_destroy() call and keep the callback limited to device destruction.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-93086 since 09/17/2026. The exploitation is known to be easy. Attacking locally is a requirement. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/17/2026).

Upgrading to version 6.6.157, 6.12.110, 6.18.52, 7.2.6 or 7.3-rc1 eliminates this vulnerability. Applying the patch aed24a3c63920539e9de7fbfe7929a2e7c888cd2/431c6b872ba7fedcc5a3afb0ec3517db4d95d088/54e5a4f7d83db4552d963d0785be32d9df680dcd/bab26acebe55e8ad3ab545abda72faa7ca28c477/c38b1e19485aaa820e52cfe162525a8af67563da is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.4

VulDB Base Score: 8.8
VulDB Temp Score: 8.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

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 6.6.157/6.12.110/6.18.52/7.2.6/7.3-rc1
Patch: aed24a3c63920539e9de7fbfe7929a2e7c888cd2/431c6b872ba7fedcc5a3afb0ec3517db4d95d088/54e5a4f7d83db4552d963d0785be32d9df680dcd/bab26acebe55e8ad3ab545abda72faa7ca28c477/c38b1e19485aaa820e52cfe162525a8af67563da

Timelineinfo

09/17/2026 Advisory disclosed
09/17/2026 +0 days CVE reserved
09/17/2026 +0 days VulDB entry created
09/17/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-93086 (🔒)
GCVE (CVE): GCVE-0-2026-93086
GCVE (VulDB): GCVE-100-407087

Entryinfo

Created: 09/17/2026 23:02
Changes: 09/17/2026 23:02 (21), 09/17/2026 23:03 (38)
Complete: 🔍
Cache ID: 216::103

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