Missing Release of Resource after Effective Lifetime in Linux kernel - CVE-2026-93082

Vulnerability details

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.

Affected software

How to mitigate CVE-2026-93082

External 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

Related Security Bulletins

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