{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72419", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.927Z", "datePublished": "2026-08-15T05:56:39.126Z", "dateUpdated": "2026-08-17T05:43:59.432Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:43:59.432Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_nat: avoid invalid nat_net pointer use on failed nf_nat_init()\n\nWe ran into below KASAN splat, which is mostly uninteresting, beside\nfor having nf_nat_register_fn() in the call chain as a cause for the\noffending access:\n\n==================================================================\nBUG: KASAN: slab-out-of-bounds in nf_nat_register_fn+0x5f9/0x640\nRead of size 8 at addr ffff890031e54c20 by task iptables/9510\n\nCPU: 0 UID: 0 PID: 9510 Comm: iptables Not tainted 6.18.18-grsec-full-20260320181326 #1 PREEMPT(voluntary)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\nCall Trace:\n \n […] dump_stack_lvl+0xee/0x160 ffff88004117eeb8\n […] print_report+0x6e/0x640 ffff88004117eee0\n […] ? __phys_addr+0x8e/0x140 ffff88004117eef0\n […] ? kasan_addr_to_slab+0x51/0xe0 ffff88004117ef08\n […] ? complete_report_info+0xec/0x1c0 ffff88004117ef20\n […] ? nf_nat_register_fn+0x5f9/0x640 ffff88004117ef48\n […] kasan_report+0xbc/0x140 ffff88004117ef50\n […] ? nf_nat_register_fn+0x5f9/0x640 ffff88004117ef90\n […] nf_nat_register_fn+0x5f9/0x640 ffff88004117eff8\n […] ? nf_nat_icmp_reply_translation+0x6e0/0x6e0 ffff88004117f070\n […] nf_tables_register_hook.part.0+0xa0/0x220 ffff88004117f080\n […] nf_tables_addchain.constprop.0+0x1054/0x1fc0 ffff88004117f0b8\n […] ? nft_chain_lookup.part.0+0x4ce/0xac0 ffff88004117f130\n […] ? nf_tables_abort+0x3d80/0x3d80 ffff88004117f190\n […] ? nf_tables_dumpreset_obj+0x100/0x100 ffff88004117f1c8\n […] ? nft_table_lookup.part.0+0x255/0x300 ffff88004117f310\n […] ? nf_tables_newchain+0x21a4/0x2fa0 ffff88004117f358\n […] nf_tables_newchain+0x21a4/0x2fa0 ffff88004117f360\n […] ? nf_tables_addchain.constprop.0+0x1fc0/0x1fc0 ffff88004117f458\n […] ? nla_get_range_signed+0x4a0/0x4a0 ffff88004117f488\n […] ? lock_acquire+0x16f/0x320 ffff88004117f490\n […] ? find_held_lock+0x3b/0xe0 ffff88004117f4b0\n […] ? __nla_parse+0x45/0x80 ffff88004117f500\n […] nfnetlink_rcv_batch+0xbca/0x19a0 ffff88004117f550\n […] ? nfnetlink_net_exit_batch+0x120/0x120 ffff88004117f618\n […] ? __sanitizer_cov_trace_switch+0x63/0xe0 ffff88004117f720\n […] ? gr_acl_handle_mmap+0x1c4/0x320 ffff88004117f7c0\n […] ? nla_get_range_signed+0x4a0/0x4a0 ffff88004117f7e8\n […] ? gr_is_capable+0x6f/0xe0 ffff88004117f830\n […] ? __nla_parse+0x45/0x80 ffff88004117f860\n […] ? skb_pull+0x103/0x1a0 ffff88004117f880\n […] nfnetlink_rcv+0x3db/0x4a0 ffff88004117f8b0\n […] ? nfnetlink_rcv_batch+0x19a0/0x19a0 ffff88004117f8d8\n […] ? netlink_lookup+0xe2/0x240 ffff88004117f900\n […] netlink_unicast+0x74b/0xb00 ffff88004117f930\n […] ? netlink_attachskb+0xb20/0xb20 ffff88004117f980\n […] ? __check_object_size+0x3e/0xaa0 ffff88004117f998\n […] ? security_netlink_send+0x51/0x160 ffff88004117f9c8\n […] netlink_sendmsg+0xa03/0x1200 ffff88004117f9f8\n […] ? netlink_unicast+0xb00/0xb00 ffff88004117fa70\n […] ? netlink_unicast+0xb00/0xb00 ffff88004117fac8\n […] ? ____sys_sendmsg+0xe2a/0x1040 ffff88004117faf8\n […] ____sys_sendmsg+0xe2a/0x1040 ffff88004117fb00\n […] ? kernel_recvmsg+0x300/0x300 ffff88004117fb60\n […] ? reacquire_held_locks+0xe9/0x260 ffff88004117fbc8\n […] ___sys_sendmsg+0x138/0x200 ffff88004117fbf8\n […] ? do_recvmmsg+0x7e0/0x7e0 ffff88004117fc30\n […] ? lockdep_hardirqs_on_prepare+0x101/0x1e0 ffff88004117fc50\n […] ? lock_acquire+0x16f/0x320 ffff88004117fd20\n […] ? lock_acquire+0x16f/0x320 ffff88004117fd58\n […] ? find_held_lock+0x3b/0xe0 ffff88004117fd70\n […] __sys_sendmsg+0x17a/0x260 ffff88004117fdc8\n […] ? __sys_sendmsg_sock+0x80/0x80 ffff88004117fdf0\n […] ? syscall_trace_enter+0x15e/0x2c0 ffff88004117fe98\n […] do_syscall_64+0x7d/0x400 ffff88004117fec8\n […] entry_SYSCALL_64_safe_stack+0x4a/0x60 ffff88004117fef8\n \n==================================================================\n\nThe out-of-bounds report, though, is a red herring as it is f\n---truncated---" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The bug is reached via the netfilter netlink path (sendmsg on NETLINK_NETFILTER) when creating an nftables NAT chain; nf_tables_newchain -> nf_tables_register_hook -> nf_nat_register_fn. This is a local syscall/configuration interface, not remote packet handling.\nAC:L - Once nf_nat built-in init has failed and another per-net consumer reuses the stale nat_net_id, a CAP_NET_ADMIN caller can deterministically trigger the type confusion by adding/removing a NAT chain; no race, memory-layout gamble, or victim interaction is required.\nPR:L - nfnetlink_rcv requires CAP_NET_ADMIN via netlink_net_capable(); on systems with user namespaces this capability is available to an unprivileged local user (e.g. unshare -Urn), not only init-namespace root.\nUI:N - Exploitation is performed entirely by the attacker configuring nftables NAT chains over netlink; no action by another user or administrator is required beyond the attacker’s own netfilter setup.\nS:U - Impact is kernel memory corruption and privilege escalation within the same host/kernel security domain; it does not cross a VM, container-to-host, or IOMMU boundary by itself.\nC:H - Stale nat_net_id makes net_generic() return a synproxy_net (24 bytes) misinterpreted as nat_net (176 bytes), causing slab out-of-bounds reads; KASAN confirmed an 8-byte OOB read and type confusion can expose adjacent per-net/kernel heap data.\nI:H - nf_nat_register_fn()/unregister_fn() write nat_hook_ops pointers, user counters, and hook entry tables through the mis-typed smaller structure, corrupting adjacent per-net memory and enabling further arbitrary write/control-flow hijack primitives.\nA:H - The mis-typed per-net access triggers KASAN slab-out-of-bounds faults and can kernel oops/panic during NAT hook registration; corrupted synproxy/per-net state can also crash or hang the system on subsequent netfilter activity." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/netfilter/nf_nat_core.c" ], "versions": [ { "version": "cbc1dd5b659f5a2c3cba88b197b7443679bb35a0", "lessThan": "359d8ff97362a4662356104540e4814bff9dad7c", "status": "affected", "versionType": "git" }, { "version": "cbc1dd5b659f5a2c3cba88b197b7443679bb35a0", "lessThan": "87f7a720de2545fdac29c85acb7163676feacdaf", "status": "affected", "versionType": "git" }, { "version": "cbc1dd5b659f5a2c3cba88b197b7443679bb35a0", "lessThan": "e794f633021defcfa98e17d73b955cd07590831f", "status": "affected", "versionType": "git" }, { "version": "cbc1dd5b659f5a2c3cba88b197b7443679bb35a0", "lessThan": "a73e7ac3f3b69e9581ec7bfd889ff3e9b8c773f7", "status": "affected", "versionType": "git" }, { "version": "cbc1dd5b659f5a2c3cba88b197b7443679bb35a0", "lessThan": "eb14aba91163c33d8c99f9d7c06690e08b56a250", "status": "affected", "versionType": "git" }, { "version": "cbc1dd5b659f5a2c3cba88b197b7443679bb35a0", "lessThan": "069cfe3de2a5e16069485893cd04665ab769c1d8", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/netfilter/nf_nat_core.c" ], "versions": [ { "version": "6.1", "status": "affected" }, { "version": "0", "lessThan": "6.1", "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": "6.1", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/359d8ff97362a4662356104540e4814bff9dad7c" }, { "url": "https://git.kernel.org/stable/c/87f7a720de2545fdac29c85acb7163676feacdaf" }, { "url": "https://git.kernel.org/stable/c/e794f633021defcfa98e17d73b955cd07590831f" }, { "url": "https://git.kernel.org/stable/c/a73e7ac3f3b69e9581ec7bfd889ff3e9b8c773f7" }, { "url": "https://git.kernel.org/stable/c/eb14aba91163c33d8c99f9d7c06690e08b56a250" }, { "url": "https://git.kernel.org/stable/c/069cfe3de2a5e16069485893cd04665ab769c1d8" } ], "title": "netfilter: nf_nat: avoid invalid nat_net pointer use on failed nf_nat_init()", "x_generator": { "engine": "bippy-1.2.0" } } } }