{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-38162", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:23.990Z", "datePublished": "2025-07-03T08:36:03.731Z", "dateUpdated": "2026-08-05T11:59:56.562Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:59:56.562Z" }, "descriptions": [ { "lang": "en", "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()." } ], "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 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/netfilter/nft_set_pipapo.c" ], "versions": [ { "version": "3c4287f62044a90e73a561aa05fc46e62da173da", "lessThan": "91edc076439c9e2f34b176149f1c84a47a8ec32f", "status": "affected", "versionType": "git" }, { "version": "3c4287f62044a90e73a561aa05fc46e62da173da", "lessThan": "a9e757473561da93c6a4136f0e59aba91ec777fc", "status": "affected", "versionType": "git" }, { "version": "3c4287f62044a90e73a561aa05fc46e62da173da", "lessThan": "c1360ac8156c0a3f2385baef91d8d26fd9d39701", "status": "affected", "versionType": "git" }, { "version": "3c4287f62044a90e73a561aa05fc46e62da173da", "lessThan": "43fe1181f738295624696ae9ff611790edb65b5e", "status": "affected", "versionType": "git" }, { "version": "3c4287f62044a90e73a561aa05fc46e62da173da", "lessThan": "4c5c6aa9967dbe55bd017bb509885928d0f31206", "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/nft_set_pipapo.c" ], "versions": [ { "version": "5.6", "status": "affected" }, { "version": "0", "lessThan": "5.6", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.167", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.125", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.34", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.15.3", "lessThanOrEqual": "6.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.16", "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": "5.6", "versionEndExcluding": "6.1.167" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.6.125" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.12.34" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.15.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.16" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/91edc076439c9e2f34b176149f1c84a47a8ec32f" }, { "url": "https://git.kernel.org/stable/c/a9e757473561da93c6a4136f0e59aba91ec777fc" }, { "url": "https://git.kernel.org/stable/c/c1360ac8156c0a3f2385baef91d8d26fd9d39701" }, { "url": "https://git.kernel.org/stable/c/43fe1181f738295624696ae9ff611790edb65b5e" }, { "url": "https://git.kernel.org/stable/c/4c5c6aa9967dbe55bd017bb509885928d0f31206" } ], "title": "netfilter: nft_set_pipapo: prevent overflow in lookup table allocation", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-07-14T12:41:33.730Z" }, "affected": [ { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": 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