{"id":"CVE-2026-74527","state":"PUBLISHED","title":"octeontx2-af: Block VFs from clobbering special CGX PKIND state","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nocteontx2-af: Block VFs from clobbering special CGX PKIND state\n\nPF and VF NIX LFs that share a CGX LMAC reuse the same hardware PKIND\nprogramming. When HiGig2 or EDSA parsing is enabled, a VF NIX LF alloc must\nnot reset the LMAC RX PKIND or default TX parse config over the PF setup.\n\nAdd cgx_get_pkind() and rvu_cgx_is_pkind_config_permitted() so VFs skip\ncgx_set_pkind(), rvu_npc_set_pkind(), and NIX_AF_LFX_TX_PARSE_CFG updates\nwhen the LMAC is using NPC_RX_HIGIG_PKIND or NPC_RX_EDSA_PKIND.","publishedAt":"2026-08-15T12:27:43.568Z","updatedAt":"2026-10-30T12:30:06.747Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"94d942c5fb970ac2166216838b278613decfa9a0","status":"affected","lessThan":"f24f7ce6fb2d1ae080a05371afddba30a3e0b919","versionType":"git"},{"version":"94d942c5fb970ac2166216838b278613decfa9a0","status":"affected","lessThan":"1106b26e86ac1e7e4d1f634bcd532c5d44e60620","versionType":"git"},{"version":"94d942c5fb970ac2166216838b278613decfa9a0","status":"affected","lessThan":"7e888d7dd11519330ba6c6a28391d55891463a6a","versionType":"git"},{"version":"94d942c5fb970ac2166216838b278613decfa9a0","status":"affected","lessThan":"a76243488740a07c81c9adf431685bb7f7c31d8c","versionType":"git"},{"version":"94d942c5fb970ac2166216838b278613decfa9a0","status":"affected","lessThan":"d3c6b0f48f126a36955b3fb4154a59d0b3621d97","versionType":"git"},{"version":"94d942c5fb970ac2166216838b278613decfa9a0","status":"affected","lessThan":"3bd438a58e910db5dc369aa25dfed1fc95f1b596","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/marvell/octeontx2/af/cgx.c","drivers/net/ethernet/marvell/octeontx2/af/cgx.h","drivers/net/ethernet/marvell/octeontx2/af/rvu.h","drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c","drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c","drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.20","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.20","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/marvell/octeontx2/af/cgx.c","drivers/net/ethernet/marvell/octeontx2/af/cgx.h","drivers/net/ethernet/marvell/octeontx2/af/rvu.h","drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c","drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c","drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c"]}],"references":["https://git.kernel.org/stable/c/f24f7ce6fb2d1ae080a05371afddba30a3e0b919","https://git.kernel.org/stable/c/1106b26e86ac1e7e4d1f634bcd532c5d44e60620","https://git.kernel.org/stable/c/7e888d7dd11519330ba6c6a28391d55891463a6a","https://git.kernel.org/stable/c/a76243488740a07c81c9adf431685bb7f7c31d8c","https://git.kernel.org/stable/c/d3c6b0f48f126a36955b3fb4154a59d0b3621d97","https://git.kernel.org/stable/c/3bd438a58e910db5dc369aa25dfed1fc95f1b596"],"weaknesses":[],"ingestedAt":"2026-10-30T12:48:04.825Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74527.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74527","state":"PUBLISHED","datePublished":"2026-08-15T12:27:43.568Z","dateUpdated":"2026-10-30T12:30:06.747Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.912Z"},"containers":{"cna":{"title":"octeontx2-af: Block VFs from clobbering special CGX PKIND state","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nocteontx2-af: Block VFs from clobbering special CGX PKIND state\n\nPF and VF NIX LFs that share a CGX LMAC reuse the same hardware PKIND\nprogramming. When HiGig2 or EDSA parsing is enabled, a VF NIX LF alloc must\nnot reset the LMAC RX PKIND or default TX parse config over the PF setup.\n\nAdd cgx_get_pkind() and rvu_cgx_is_pkind_config_permitted() so VFs skip\ncgx_set_pkind(), rvu_npc_set_pkind(), and NIX_AF_LFX_TX_PARSE_CFG updates\nwhen the LMAC is using NPC_RX_HIGIG_PKIND or NPC_RX_EDSA_PKIND."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"94d942c5fb970ac2166216838b278613decfa9a0","status":"affected","lessThan":"f24f7ce6fb2d1ae080a05371afddba30a3e0b919","versionType":"git"},{"version":"94d942c5fb970ac2166216838b278613decfa9a0","status":"affected","lessThan":"1106b26e86ac1e7e4d1f634bcd532c5d44e60620","versionType":"git"},{"version":"94d942c5fb970ac2166216838b278613decfa9a0","status":"affected","lessThan":"7e888d7dd11519330ba6c6a28391d55891463a6a","versionType":"git"},{"version":"94d942c5fb970ac2166216838b278613decfa9a0","status":"affected","lessThan":"a76243488740a07c81c9adf431685bb7f7c31d8c","versionType":"git"},{"version":"94d942c5fb970ac2166216838b278613decfa9a0","status":"affected","lessThan":"d3c6b0f48f126a36955b3fb4154a59d0b3621d97","versionType":"git"},{"version":"94d942c5fb970ac2166216838b278613decfa9a0","status":"affected","lessThan":"3bd438a58e910db5dc369aa25dfed1fc95f1b596","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/marvell/octeontx2/af/cgx.c","drivers/net/ethernet/marvell/octeontx2/af/cgx.h","drivers/net/ethernet/marvell/octeontx2/af/rvu.h","drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c","drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c","drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.20","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.20","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/marvell/octeontx2/af/cgx.c","drivers/net/ethernet/marvell/octeontx2/af/cgx.h","drivers/net/ethernet/marvell/octeontx2/af/rvu.h","drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c","drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c","drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/f24f7ce6fb2d1ae080a05371afddba30a3e0b919"},{"url":"https://git.kernel.org/stable/c/1106b26e86ac1e7e4d1f634bcd532c5d44e60620"},{"url":"https://git.kernel.org/stable/c/7e888d7dd11519330ba6c6a28391d55891463a6a"},{"url":"https://git.kernel.org/stable/c/a76243488740a07c81c9adf431685bb7f7c31d8c"},{"url":"https://git.kernel.org/stable/c/d3c6b0f48f126a36955b3fb4154a59d0b3621d97"},{"url":"https://git.kernel.org/stable/c/3bd438a58e910db5dc369aa25dfed1fc95f1b596"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - Exploitation requires a malicious SR-IOV VF tenant to send NIX_LF_ALLOC mailbox messages over PCI BAR registers during netdev bring-up; the vulnerable AF code is not reachable from remote network packets.\nAC:L - In the target OcteonTX2 DSA/HiGig multi-tenant deployment, a VF reliably triggers the bug by opening its netdev; no races or attacker-uncontrollable memory layout are needed once HiGig/EDSA parsing is enabled on the shared LMAC.\nPR:L - The attacker is a cloud/NFV tenant with an assigned OcteonTX2 VF; triggering NIX LF allocation during interface up requires only guest-level netdev privileges (e.g., CAP_NET_ADMIN in the VM), not host root or init-namespace admin rights.\nUI:N - No victim interaction is required; the clobber occurs automatically when the attacker brings up or reinitializes their VF network interface through the standard driver probe/open path.\nS:C - A VF guest corrupts host-managed shared CGX LMAC hardware PKIND and NPC parse configuration, impacting the PF and other functions on that port beyond the VF's own security authority—crossing the VM/tenant isolation boundary.\nC:H - Resetting HiGig/EDSA RX PKIND misconfigures NPC packet parsing for the entire shared LMAC, potentially misdelivering or exposing fabric/switch-tagged traffic intended for the PF or other tenants to the attacker's VF.\nI:H - The VF forcibly overwrites shared LMAC RX PKIND via cgx_set_pkind() and programs default TX parse config, corrupting host-controlled switching-header parsing that governs how transmitted and received fabric traffic is processed on the port.\nA:H - Clobbering special HiGig/EDSA PKIND state breaks correct packet parsing for all PF/VF traffic on the shared LMAC, causing sustained loss of connectivity and denial of network service to the host and co-located tenants."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:30:06.747Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.18.57"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"7.1.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-74527","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T18:59:11.086821Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-16T19:05:53.016Z"}}]}}}