{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72312","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-09T03:40:39.918Z","datePublished":"2026-08-15T05:55:27.817Z","dateUpdated":"2026-08-17T05:42:39.727Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:42:39.727Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nocteontx2-af: fix VF bringup affecting PF promiscuous state\n\nMbox handling of nix_set_rx_mode for a VF with promiscuous and\nall_multi flags set to false causes deletion of the PF's promiscuous\nand allmulti MCAM rules. This occurs because the APIs that\nenable/disable these rules operate only on the PF, even when the\nmbox request is made via a VF interface.\n\nGuard both rvu_npc_enable_allmulti_entry() and\nrvu_npc_enable_promisc_entry() disable paths with an is_vf() check so\nthat a VF bringing up or tearing down its interface cannot inadvertently\nclear the PF's MCAM rules."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H","baseScore":7.9,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - Exploitation requires local control of an SR-IOV VF netdev on Marvell OcteonTX2/CN10K hardware; the bug is triggered via the VF driver's mailbox to the AF (rvu_mbox_handler_nix_set_rx_mode), not by remote packet delivery.\nAC:L - An attacker with VF netdev access can reliably trigger the flaw by bringing the interface up/down or changing rx_mode (e.g., ip link set up), which sends NIX_SET_RX_MODE with promisc/allmulti cleared; no race or victim timing is required.\nPR:L - Only guest/namespace CAP_NET_ADMIN (or equivalent root in an SR-IOV-assigned VM) is needed to manage the VF netdev; host init-namespace root is not required and user namespaces cannot reach this hardware path without the VF device.\nUI:N - No victim interaction is needed; the attacker initiates VF interface bringup/teardown or rx_mode updates that invoke otx2_do_set_rx_mode/otx2vf_do_set_rx_mode and the AF mbox handler.\nS:C - A VF tenant can alter PF-side NPC MCAM promiscuous/allmulti rules (rvu_npc_enable_promisc_entry/rvu_npc_enable_allmulti_entry mask pcifunc to the PF), crossing the SR-IOV isolation boundary between guest/tenant and host/provider packet filtering.\nC:L - Disabling the PF promiscuous/allmulti MCAM entries can blind host IDS/tcpdump and other monitoring that depends on promiscuous reception, reducing visibility into network traffic on the affected PF (limited confidentiality impact, not arbitrary kernel memory read).\nI:L - The VF causes unauthorized modification of host-side hardware packet-filter state by disabling PF MCAM promisc/allmulti rules; this is limited integrity impact on network policy rather than arbitrary memory or code execution.\nA:H - Clearing PF promiscuous and allmulti MCAM rules can break or degrade PF multicast delivery and promiscuous capture/monitoring on internet-facing cloud/edge servers using these NICs, and can be repeated by cycling the VF interface."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c"],"versions":[{"version":"967db3529ecac305d230aa4e60abddf6ab63543a","lessThan":"daa2451640a3e0727fd598f5c2ccb8bb4d5a8b9c","status":"affected","versionType":"git"},{"version":"967db3529ecac305d230aa4e60abddf6ab63543a","lessThan":"212c59e5e416859579272288fd325148fc316109","status":"affected","versionType":"git"},{"version":"967db3529ecac305d230aa4e60abddf6ab63543a","lessThan":"53e17d9ed779ad25870abb9c31bc294c71a2278c","status":"affected","versionType":"git"},{"version":"967db3529ecac305d230aa4e60abddf6ab63543a","lessThan":"3de77d2f34c2bc2acaedabc2c5e0a561b85c283a","status":"affected","versionType":"git"},{"version":"967db3529ecac305d230aa4e60abddf6ab63543a","lessThan":"3cf83432e0561aef6d7ec2664909d12d0ff0ffc1","status":"affected","versionType":"git"},{"version":"967db3529ecac305d230aa4e60abddf6ab63543a","lessThan":"fabb881df322da25442f98d23f5fa371e3c78ec4","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c"],"versions":[{"version":"5.14","status":"affected"},{"version":"0","lessThan":"5.14","status":"unaffected","versionType":"semver"},{"version":"6.1.178","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.145","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.97","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.40","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.5","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/daa2451640a3e0727fd598f5c2ccb8bb4d5a8b9c"},{"url":"https://git.kernel.org/stable/c/212c59e5e416859579272288fd325148fc316109"},{"url":"https://git.kernel.org/stable/c/53e17d9ed779ad25870abb9c31bc294c71a2278c"},{"url":"https://git.kernel.org/stable/c/3de77d2f34c2bc2acaedabc2c5e0a561b85c283a"},{"url":"https://git.kernel.org/stable/c/3cf83432e0561aef6d7ec2664909d12d0ff0ffc1"},{"url":"https://git.kernel.org/stable/c/fabb881df322da25442f98d23f5fa371e3c78ec4"}],"title":"octeontx2-af: fix VF bringup affecting PF promiscuous state","x_generator":{"engine":"bippy-1.2.0"}}}}