CVE-2026-74527
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
In the Linux kernel, in the octeontx2-af subsystem, a vulnerability was found that allows virtual functions (VFs) to overwrite special CGX PKIND state. When HiGig2 or EDSA parsing is enabled, a VF NIX LF allocation must not reset the LMAC RX PKIND or default TX parse config over the PF setup. Missing permission-checking functions.
Risk Assessment
Overwriting configuration by VFs can lead to network disruption, violation of isolation between functions, or potentially privilege escalation in virtualized environments.
Recommendation
Apply the kernel patch that adds cgx_get_pkind() and rvu_cgx_is_pkind_config_permitted() so VFs skip relevant operations when special PKIND is in use. Update the system to a kernel version with the fix.
Original NVD description (English source)
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.