506 lines
29 KiB
JSON
506 lines
29 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-21959",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-12-29T08:45:45.793Z",
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"datePublished": "2025-04-01T15:46:57.775Z",
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"dateUpdated": "2026-11-10T12:35:35.142Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:55:37.933Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conncount: Fully initialize struct nf_conncount_tuple in insert_tree()\n\nSince commit b36e4523d4d5 (\"netfilter: nf_conncount: fix garbage\ncollection confirm race\"), `cpu` and `jiffies32` were introduced to\nthe struct nf_conncount_tuple.\n\nThe commit made nf_conncount_add() initialize `conn->cpu` and\n`conn->jiffies32` when allocating the struct.\nIn contrast, count_tree() was not changed to initialize them.\n\nBy commit 34848d5c896e (\"netfilter: nf_conncount: Split insert and\ntraversal\"), count_tree() was split and the relevant allocation\ncode now resides in insert_tree().\nInitialize `conn->cpu` and `conn->jiffies32` in insert_tree().\n\nBUG: KMSAN: uninit-value in find_or_evict net/netfilter/nf_conncount.c:117 [inline]\nBUG: KMSAN: uninit-value in __nf_conncount_add+0xd9c/0x2850 net/netfilter/nf_conncount.c:143\n find_or_evict net/netfilter/nf_conncount.c:117 [inline]\n __nf_conncount_add+0xd9c/0x2850 net/netfilter/nf_conncount.c:143\n count_tree net/netfilter/nf_conncount.c:438 [inline]\n nf_conncount_count+0x82f/0x1e80 net/netfilter/nf_conncount.c:521\n connlimit_mt+0x7f6/0xbd0 net/netfilter/xt_connlimit.c:72\n __nft_match_eval net/netfilter/nft_compat.c:403 [inline]\n nft_match_eval+0x1a5/0x300 net/netfilter/nft_compat.c:433\n expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]\n nft_do_chain+0x426/0x2290 net/netfilter/nf_tables_core.c:288\n nft_do_chain_ipv4+0x1a5/0x230 net/netfilter/nft_chain_filter.c:23\n nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]\n nf_hook_slow+0xf4/0x400 net/netfilter/core.c:626\n nf_hook_slow_list+0x24d/0x860 net/netfilter/core.c:663\n NF_HOOK_LIST include/linux/netfilter.h:350 [inline]\n ip_sublist_rcv+0x17b7/0x17f0 net/ipv4/ip_input.c:633\n ip_list_rcv+0x9ef/0xa40 net/ipv4/ip_input.c:669\n __netif_receive_skb_list_ptype net/core/dev.c:5936 [inline]\n __netif_receive_skb_list_core+0x15c5/0x1670 net/core/dev.c:5983\n __netif_receive_skb_list net/core/dev.c:6035 [inline]\n netif_receive_skb_list_internal+0x1085/0x1700 net/core/dev.c:6126\n netif_receive_skb_list+0x5a/0x460 net/core/dev.c:6178\n xdp_recv_frames net/bpf/test_run.c:280 [inline]\n xdp_test_run_batch net/bpf/test_run.c:361 [inline]\n bpf_test_run_xdp_live+0x2e86/0x3480 net/bpf/test_run.c:390\n bpf_prog_test_run_xdp+0xf1d/0x1ae0 net/bpf/test_run.c:1316\n bpf_prog_test_run+0x5e5/0xa30 kernel/bpf/syscall.c:4407\n __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5813\n __do_sys_bpf kernel/bpf/syscall.c:5902 [inline]\n __se_sys_bpf kernel/bpf/syscall.c:5900 [inline]\n __ia32_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5900\n ia32_sys_call+0x394d/0x4180 arch/x86/include/generated/asm/syscalls_32.h:358\n do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]\n __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/common.c:387\n do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:412\n do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:450\n entry_SYSENTER_compat_after_hwframe+0x84/0x8e\n\nUninit was created at:\n slab_post_alloc_hook mm/slub.c:4121 [inline]\n slab_alloc_node mm/slub.c:4164 [inline]\n kmem_cache_alloc_noprof+0x915/0xe10 mm/slub.c:4171\n insert_tree net/netfilter/nf_conncount.c:372 [inline]\n count_tree net/netfilter/nf_conncount.c:450 [inline]\n nf_conncount_count+0x1415/0x1e80 net/netfilter/nf_conncount.c:521\n connlimit_mt+0x7f6/0xbd0 net/netfilter/xt_connlimit.c:72\n __nft_match_eval net/netfilter/nft_compat.c:403 [inline]\n nft_match_eval+0x1a5/0x300 net/netfilter/nft_compat.c:433\n expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]\n nft_do_chain+0x426/0x2290 net/netfilter/nf_tables_core.c:288\n nft_do_chain_ipv4+0x1a5/0x230 net/netfilter/nft_chain_filter.c:23\n nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]\n nf_hook_slow+0xf4/0x400 net/netfilter/core.c:626\n nf_hook_slow_list+0x24d/0x860 net/netfilter/core.c:663\n NF_HOOK_LIST include/linux/netfilter.h:350 [inline]\n ip_sublist_rcv+0x17b7/0x17f0 net/ipv4/ip_input.c:633\n ip_list_rcv+0x9ef/0xa40 net/ip\n---truncated---"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
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"baseScore": 7.3,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - The vulnerable `insert_tree()` allocation and the subsequent `find_or_evict()` read of the uninitialized fields execute in the netfilter packet-receive path (`ip_list_rcv → nf_hook_slow → connlimit_mt`/`ovs_ct_check_limit`) on packets arriving from remote peers. A remote host simply sending connections to a box carrying an iptables `-m connlimit` rule or an OVS conntrack zone limit drives the code.\nAC:L - The fields are left uninitialized on every `insert_tree()` allocation, and the attacker controls both sides of the conditioning window by opening many concurrent connections from the same source prefix so entries remain unconfirmed when `find_or_evict()` walks them. `CONFIG_NETFILTER_XT_MATCH_CONNLIMIT` is shipped by all mainstream distributions and connlimit/OVS ct-limit rules are common on internet-facing and cloud deployments, so no rare configuration is required.\nPR:N - The path is reached from raw inbound IP packets processed in a netfilter hook before any authentication or authorization; no account, credential, or capability on the target is needed. The alternative local trigger via unprivileged user namespaces would only be PR:L, so the unauthenticated remote scenario dominates.\nUI:N - Exploitation requires only that the attacker transmit packets to the target; no administrator or user action is needed once the connlimit/ct-limit rule is in place.\nS:U - The uninitialized read and its consequences are confined to the kernel's own nf_conncount accounting state within the same security authority; no VM, IOMMU, container, or sandbox boundary is crossed.\nC:L - `conn->cpu` and `conn->jiffies32` are read from recycled slab memory (the cache is created with flags 0, so it is merge-eligible with other same-size caches) and the values steer whether a packet is accepted or dropped, giving a remote observer a limited, bounded inference channel into residual kernel heap contents. Nothing is copied out directly, so the disclosure is limited rather than arbitrary read.\nI:L - The garbage values corrupt nf_conncount's eviction heuristic so `list->count` no longer reflects the real number of tracked connections, causing the administrator-configured connlimit / OVS per-zone limit to be enforced against a wrong count and letting an attacker exceed it. This is a limited modification of security-relevant kernel state, not an arbitrary write or control-flow hijack.\nA:L - Under-counting defeats a connection-limit control that exists to prevent resource exhaustion, letting an attacker consume more connections than permitted, while transient over-counting drops legitimate traffic from an affected source. The fields are only compared, never dereferenced or used as indices, so there is no oops, panic, hang, or memory corruption — the result is degradation rather than total loss of availability."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/netfilter/nf_conncount.c"
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"status": "unaffected",
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},
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"version": "6.13.8",
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"status": "unaffected",
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},
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{
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"version": "6.14",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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],
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"title": "netfilter: nf_conncount: Fully initialize struct nf_conncount_tuple in insert_tree()",
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"type": "CWE",
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"metrics": [
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{
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"attackVector": "LOCAL",
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"baseSeverity": "MEDIUM",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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"integrityImpact": "NONE",
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"userInteraction": "NONE",
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"attackComplexity": "LOW",
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"privilegesRequired": "LOW",
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"confidentialityImpact": "NONE"
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}
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},
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2025-10-01T17:15:56.023953Z",
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"id": "CVE-2025-21959",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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}
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"dateUpdated": "2025-10-01T17:15:58.938Z"
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}
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},
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{
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"title": "CVE Program Container",
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"
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{
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} |