467 lines
23 KiB
JSON
467 lines
23 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2025-38162",
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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": "2025-04-16T04:51:23.990Z",
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"datePublished": "2025-07-03T08:36:03.731Z",
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"dateUpdated": "2026-11-10T12:36:15.252Z"
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},
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:59:56.562Z"
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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: nft_set_pipapo: prevent overflow in lookup table allocation\n\nWhen calculating the lookup table size, ensure the following\nmultiplication does not overflow:\n\n- desc->field_len[] maximum value is U8_MAX multiplied by\n NFT_PIPAPO_GROUPS_PER_BYTE(f) that can be 2, worst case.\n- NFT_PIPAPO_BUCKETS(f->bb) is 2^8, worst case.\n- sizeof(unsigned long), from sizeof(*f->lt), lt in\n struct nft_pipapo_field.\n\nThen, use check_mul_overflow() to multiply by bucket size and then use\ncheck_add_overflow() to the alignment for avx2 (if needed). Finally, add\nlt_size_check_overflow() helper and use it to consolidate this.\n\nWhile at it, replace leftover allocation using the GFP_KERNEL to\nGFP_KERNEL_ACCOUNT for consistency, in pipapo_resize()."
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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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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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:L - The vulnerable allocation is reached only through nftables set creation and element insertion via the nfnetlink netlink socket (NFT_MSG_NEWSET/NFT_MSG_NEWSETELEM), which requires local system access. Per kernel scoring guidance, netfilter/nftables netlink paths are Local.\nAC:L - Every input that feeds the overflowing expression — field count, per-field length via NFTA_SET_DESC_CONCAT, group-bit width, and the rule count that drives bsize — is chosen directly by the attacker, with no race to win and no memory layout or victim state outside their control. The attack is deterministic and repeatable.\nPR:L - nfnetlink_rcv() enforces only netlink_net_capable(skb, CAP_NET_ADMIN), which is namespace-relative, so any unprivileged local user obtains it with unshare -Urn and can then create pipapo sets and insert elements. This is Low, not High, since no real root in the init namespace is needed.\nUI:N - The attacker performs the whole sequence themselves through netlink syscalls; no victim needs to open a file, mount a filesystem, or take any other action.\nS:U - The integer overflow and the resulting memory corruption are both confined to the kernel's own security authority, with no crossing of a VM, IOMMU, or sandbox boundary. This is a standard in-kernel privilege-escalation shape.\nC:H - The undersized lookup table is subsequently indexed by pipapo_bucket_set() and by the AVX2/generic lookup routines using the un-truncated groups/buckets/bsize geometry, producing out-of-bounds reads of adjacent kernel memory that can be observed through set matching results and element dumps. Heap corruption of this kind is treated as enabling arbitrary read.\nI:H - After the wrap, pipapo_resize()'s memcpy loop and every __set_bit() in pipapo_insert() write beyond the allocation, giving a controlled out-of-bounds heap write into adjacent objects. An OOB write of this form is exploitable for control-flow hijacking or arbitrary modification of kernel structures.\nA:H - Writing past the end of a kvzalloc()'d region corrupts neighbouring allocations and slab/vmalloc metadata, reliably producing an oops or panic (immediately under KASAN or hardened allocators). Any such kernel crash is High."
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}
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