Bug 2516639 (CVE-2026-72045)

Summary: CVE-2026-72045 kernel: octeontx2-af: cn10k: restrict VF LMTLINE sharing to its own PF
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: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel component `octeontx2-af`. A local attacker with access to a Virtual Function (VF) could exploit an unsanitized input in the `rvu_mbox_handler_lmtst_tbl_setup()` function. This vulnerability allows the VF to read the physical base address of another function's LMTLINE, which could lead to information disclosure and unauthorized access to sensitive system memory.
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Description OSIDB Bzimport 2026-08-15 06:23:23 UTC 
In the Linux kernel, the following vulnerability has been resolved:

octeontx2-af: cn10k: restrict VF LMTLINE sharing to its own PF

rvu_mbox_handler_lmtst_tbl_setup() uses req->base_pcifunc as a direct
index into the LMT map table to read another function's LMTLINE
physical base address and copy it into the caller's own LMT map table
entry. The mailbox dispatcher authenticates req->hdr.pcifunc from the
IRQ source, but req->base_pcifunc is a separate payload field and is
not sanitized.

Reject the request with -EPERM when a VF caller's base_pcifunc is not a
valid function under its own PF. is_pf_func_valid() bounds the FUNC field
to the PF's configured VF count, keeping the computed index inside the
caller's own slot block.
Comment 1 Keith Grant 2026-08-17 17:48:45 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081514-CVE-2026-72045-21ac@gregkh/T