270 lines
15 KiB
JSON
270 lines
15 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-2026-53267",
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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": "2026-06-09T07:44:35.395Z",
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"datePublished": "2026-06-25T08:39:53.852Z",
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"dateUpdated": "2026-10-30T12:26:52.583Z"
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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": "2026-10-30T12:26:52.583Z"
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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_ct: bail out on template ct in get eval\n\nI noticed this issue while looking at a historic syzbot report [1].\n\nA rule like the one below is enough to trigger the bug:\n\n table ip t {\n chain pre {\n type filter hook prerouting priority raw;\n ct zone set 1\n ct original saddr 1.2.3.4 accept\n }\n }\n\nThe first expression attaches a per-cpu template ct via\nnft_ct_set_zone_eval() (nf_ct_tmpl_alloc -> kzalloc, tuple is all\nzero, nf_ct_l3num(ct) == 0). The next expression then calls\nnft_ct_get_eval() on the same skb, treats the template as a real ct\nand hits the 16-byte memcpy path. With dreg at NFT_REG32_15 this\noverflows past struct nft_regs on the kernel stack; with smaller\ndreg values it silently clobbers adjacent registers.\n\nReject template ct at the eval entry and in nft_ct_get_fast_eval(),\nmirroring the check nft_ct_set_eval() already has. Additionally,\nbound the address copy in NFT_CT_SRC / NFT_CT_DST by priv->len\ninstead of by nf_ct_l3num(ct): nf_ct_get_tuple() zeroes the tuple\nbefore pkt_to_tuple() fills in only the protocol-relevant leading\nbytes, so the trailing bytes of tuple->{src,dst}.u3.all are\nwell-defined zero. priv->len is validated at rule load, so the\ncopy size is now bounded by the destination register rather than\nby an untrusted field on the conntrack.\n\n[1]: https://syzkaller.appspot.com/bug?id=389cf09cb72926114fce90dc85a2c3231dcb647c"
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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 code is reached by installing crafted nftables/netfilter rules through NETLINK_NETFILTER and then triggering packet evaluation locally. Remote packets alone cannot install the rule, so this is a local attack vector.\nAC:L - A single crafted rule sequence such as `ct zone set` followed by `ct original saddr` can deterministically trigger the bug on matching packets. No race or external condition beyond the attacker's control is required.\nPR:L - Rule creation requires CAP_NET_ADMIN for the relevant network namespace via nfnetlink. Because nftables is reachable with CAP_NET_ADMIN in a user-created network namespace on systems permitting unprivileged user namespaces, this is low privileges rather than high.\nUI:N - After the attacker installs the crafted rule, triggering occurs through packet processing without any victim user action. No user needs to open a file, mount anything, or interact with attacker-controlled content.\nS:U - The bug corrupts kernel memory during kernel packet-filter evaluation and impacts the same kernel security authority. This is standard kernel privilege escalation/DoS behavior, not a VM, IOMMU, or distinct security-scope escape.\nC:H - The bug is a kernel stack out-of-bounds write past `struct nft_regs`, a memory corruption primitive. Under the required higher-severity rule, such memory corruption is defensibly treated as capable of enabling high confidentiality impact.\nI:H - The vulnerable 16-byte memcpy can overwrite beyond the validated destination register on the kernel stack. Out-of-bounds kernel writes are high integrity impact because they can plausibly be developed into control-flow or privilege-modification primitives.\nA:H - The stack overwrite can corrupt adjacent stack state or registers during packet evaluation and can crash or oops the kernel. Kernel crash or panic is high availability impact."
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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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"vendor": "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/nft_ct.c",
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"net/netfilter/nft_ct_fast.c"
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],
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"versions": [
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{
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"version": "45d9bcda21f4c13be75e3571b0f0ef39e77934b5",
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"lessThan": "15bf8091f424f97ed8bfd2385f9fca3203f27be2",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "45d9bcda21f4c13be75e3571b0f0ef39e77934b5",
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"lessThan": "af80f78ce984649e1698b841cd33f4fa505ad828",
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"status": "affected",
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"versionType": "git"
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"version": "45d9bcda21f4c13be75e3571b0f0ef39e77934b5",
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"status": "affected",
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"versionType": "git"
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{
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "45d9bcda21f4c13be75e3571b0f0ef39e77934b5",
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"lessThan": "2e154b5f53f1b0b490c7b8b02499f90feb86b1d5",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "45d9bcda21f4c13be75e3571b0f0ef39e77934b5",
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"lessThan": "3027ecbdb5fdf9200251c21d4818e4c447ef78e1",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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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/nft_ct.c",
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"net/netfilter/nft_ct_fast.c"
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],
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"versions": [
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{
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"version": "4.1",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "4.1",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.143",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.94",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.36",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0.13",
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"lessThanOrEqual": "7.0.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1",
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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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}
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],
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"cpeApplicability": [
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"nodes": [
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.1",
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"versionEndExcluding": "6.1.191"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/15bf8091f424f97ed8bfd2385f9fca3203f27be2"
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},
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{
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"url": "https://git.kernel.org/stable/c/af80f78ce984649e1698b841cd33f4fa505ad828"
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},
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{
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"url": "https://git.kernel.org/stable/c/8470f676eadeab99132708acb1a85915664d6115"
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},
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{
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"url": "https://git.kernel.org/stable/c/f071b0bf078146368d18e4eec386bf2ddc0ab7e0"
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},
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{
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"url": "https://git.kernel.org/stable/c/2e154b5f53f1b0b490c7b8b02499f90feb86b1d5"
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},
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{
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"url": "https://git.kernel.org/stable/c/3027ecbdb5fdf9200251c21d4818e4c447ef78e1"
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}
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],
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"title": "netfilter: nft_ct: bail out on template ct in get eval",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-53267",
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"role": "CISA Coordinator",
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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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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T15:28:07.142807Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-121",
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"description": "CWE-121 Stack-based Buffer Overflow"
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}
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]
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-19T19:57:32.699Z"
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}
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}
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]
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}
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} |