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vuln-cve/data/2023/52xxx/CVE-2023-52628.json
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{
"dataType": "CVE_RECORD",
"cveMetadata": {
"cveId": "CVE-2023-52628",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-03-06T09:52:12.091Z",
"datePublished": "2024-03-28T07:33:46.217Z",
"dateUpdated": "2026-08-05T09:10:47.591Z"
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nftables: exthdr: fix 4-byte stack OOB write\n\nIf priv->len is a multiple of 4, then dst[len / 4] can write past\nthe destination array which leads to stack corruption.\n\nThis construct is necessary to clean the remainder of the register\nin case ->len is NOT a multiple of the register size, so make it\nconditional just like nft_payload.c does.\n\nThe bug was added in 4.1 cycle and then copied/inherited when\ntcp/sctp and ip option support was added.\n\nBug reported by Zero Day Initiative project (ZDI-CAN-21950,\nZDI-CAN-21951, ZDI-CAN-21961)."
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"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"
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"lang": "en",
"value": "AV:L - The vulnerable nft_exthdr eval paths are reached only after an attacker installs a crafted nftables rule over netlink and then triggers packet evaluation in that netns; nftables/netlink is a local attack surface, not remote packet parsing.\nAC:L - The attacker fully controls dreg/len via rule creation and can reliably force len to be a multiple of 4 that fills regs to the end, then trigger evaluation with a crafted local packet; no race or uncontrolled condition is required.\nPR:L - Rule installation requires CAP_NET_ADMIN checked via netlink_net_capable against the network namespace user_ns, which an unprivileged process obtains with user and network namespaces (unshare -Urn).\nUI:N - No victim action is needed; the attacker creates the malicious rule and sends packets in their own netns to hit the exthdr expression.\nS:U - Impact is kernel memory corruption / potential privilege escalation within the same host kernel authority; this is not a VM, IOMMU, or other cross-boundary escape.\nC:H - A kernel stack out-of-bounds write corrupts adjacent stack state and, per memory-corruption guidance and vendor notes of potential information disclosure, can be leveraged toward confidentiality impact; when uncertain the higher severity applies.\nI:H - This is a confirmed stack out-of-bounds write past struct nft_regs (into stackptr/jumpstack territory), and OOB writes are scored High for integrity due to exploitable control-flow / memory-corruption potential.\nA:H - Stack corruption adjacent to nft_do_chain locals can cause kernel oops/panic or broken jump-stack handling, yielding a high availability impact."
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