Bug 2535254 (CVE-2026-89852)

Summary: CVE-2026-89852 kernel: scsi: qla2xxx: Zero mailbox struct in qla2x00_get_firmware_state()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in scsi: qla2xxx. An uninitialized mailbox structure (`mbx_cmd_t`) can lead to the exposure of kernel stack memory to userspace. This occurs when the `qla2x00_get_firmware_state()` function copies uninitialized mailbox register values, which are not properly written due to early return paths in `qla2x00_mailbox_command()`. A local attacker could potentially exploit this to gain sensitive information from the kernel stack.
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Description OSIDB Bzimport 2026-09-16 11:39:21 UTC 
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.
Comment 1 Mauro Matteo Cascella 2026-09-22 12:41:56 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89852.mbox