SB20260918128 - Missing Release of Resource after Effective Lifetime in Linux kernel arm_scmi transports driver

Description

This security bulletin contains information about 1 vulnerability.

1) Missing Release of Resource after Effective Lifetime (CVE-ID: CVE-2026-93082)

CWE-ID: CWE-772 - Missing Release of Resource after Effective Lifetime

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to failure to release an allocated mailbox channel in mailbox_chan_setup() in the ARM SCMI mailbox transport when requesting an additional P2A receiver mailbox channel after acquiring the primary channel. A local user can trigger a failure in the additional channel request to cause a denial of service.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/3515aed7fe424b79c49ff9cd51f7802a64a4ab7b
• https://git.kernel.org/stable/c/3b0b02134ab90202af80b102fa37196b9689e86f
• https://git.kernel.org/stable/c/4c2a5d72357e5c6743c23b59615da287140d9d31
• https://git.kernel.org/stable/c/f3e3773c4e5e96549d7540d8ddeb4fcd534f6f1d