Bug 2517028 (CVE-2026-74527)

Summary: CVE-2026-74527 kernel: octeontx2-af: Block VFs from clobbering special CGX PKIND 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: 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's octeontx2-af driver. When Physical Functions (PFs) and Virtual Functions (VFs) share a network interface controller's (NIC) hardware programming (PKIND state), a Virtual Function could overwrite the configuration set by the Physical Function. This could lead to unintended changes in network traffic processing, potentially causing a denial of service or unexpected behavior.
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Description OSIDB Bzimport 2026-08-15 12:45:24 UTC 
In the Linux kernel, the following vulnerability has been resolved:

octeontx2-af: Block VFs from clobbering special CGX PKIND state

PF and VF NIX LFs that share a CGX LMAC reuse the same hardware PKIND
programming. When HiGig2 or EDSA parsing is enabled, a VF NIX LF alloc must
not reset the LMAC RX PKIND or default TX parse config over the PF setup.

Add cgx_get_pkind() and rvu_cgx_is_pkind_config_permitted() so VFs skip
cgx_set_pkind(), rvu_npc_set_pkind(), and NIX_AF_LFX_TX_PARSE_CFG updates
when the LMAC is using NPC_RX_HIGIG_PKIND or NPC_RX_EDSA_PKIND.
Comment 1 Mauro Matteo Cascella 2026-08-20 18:15:50 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081546-CVE-2026-74527-3439@gregkh/T