277 lines
15 KiB
JSON
277 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-2026-74616",
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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": "2026-08-15T05:44:03.920Z",
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"datePublished": "2026-08-22T15:32:01.313Z",
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"dateUpdated": "2026-10-16T19:06:02.219Z"
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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": "2026-08-25T05:40:43.432Z"
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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\nxdp: reject clones that overrun skb_shared_info tailroom\n\nxdpf_clone() clones broadcast copies into a single page and sets\nframe_sz to PAGE_SIZE. __xdp_build_skb_from_frame() later treats that\npage like a normal XDP frame and expects the usual skb_shared_info\ntailroom at the end of the buffer.\n\nThe current check only rejects frames whose linear xdp_frame header,\nheadroom, and packet data exceed PAGE_SIZE. A source frame backed by a\nlarger allocation can still satisfy that check while extending into the\nclone's required shared-info area. When such a clone is converted back\ninto an skb, build_skb_around() places skb_shared_info over live packet\nbytes and later writes can corrupt XDP return metadata.\n\nReject clones unless their linear area fits inside\nSKB_WITH_OVERHEAD(PAGE_SIZE), matching the tailroom requirement already\nenforced by the XDP-to-skb conversion path."
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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:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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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 - Remote packets on an XDP ingress netdev whose program calls bpf_xdp_redirect_map() with BPF_F_BROADCAST reach xdpf_clone() through dev_map_enqueue_multi(); edge L4 load balancers and container fan-out to veth peers are common deployments where cloned frames later hit __xdp_build_skb_from_frame() without any local attacker access.\nAC:L - Once broadcast devmap redirect is deployed, an attacker can reliably craft linear frames whose headroom plus payload fall in the SKB_WITH_OVERHEAD(PAGE_SIZE)..PAGE_SIZE window; no race, timing luck, or uncontrollable memory layout is required and the condition can be retried with each packet.\nPR:N - Loading/attaching the XDP program and populating the devmap requires CAP_BPF and CAP_NET_ADMIN on the host, but an unauthenticated remote sender on the already-configured datapath needs no privileges on the victim system, matching the CNA pattern used for the related devmap broadcast clone issue CVE-2026-64355.\nUI:N - Exploitation is driven entirely by network traffic processed in NAPI/softirq after XDP redirect; no victim mount, file open, or other interactive action is required beyond packets reaching the configured interface.\nS:U - The flaw corrupts skb_shared_info placement and metadata within the host kernel address space during skb construction; it does not inherently cross VM, hypervisor, or IOMMU security boundaries.\nC:H - build_skb_around() places skb_shared_info over live packet bytes and memset initializes it there; subsequent skb/shinfo access can read kernel metadata and adjacent buffer contents beyond intended bounds, constituting exploitable out-of-bounds memory disclosure.\nI:H - Overlapping skb_shared_info tailroom lets kernel writes corrupt packet data and lets attacker-influenced bytes corrupt shinfo fields used by later stack, GRO, and transmit paths, giving an out-of-bounds write primitive over frame metadata.\nA:H - Tailroom overlap during __xdp_build_skb_from_frame() can fault or corrupt state during skb construction and downstream processing, producing kernel oops/panic; an attacker can trigger this repeatedly with crafted packets on the broadcast redirect path."
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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/core/xdp.c"
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],
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"versions": [
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{
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"version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266",
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"lessThan": "58408982fa39f9758124cec169f42854d6f98f35",
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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": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266",
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"lessThan": "685edea27ac68d08fe4dbd3de74b858d2ad8e830",
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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": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266",
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"lessThan": "ba13763d667e008e185fedf592d53846a5b457d1",
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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": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266",
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"lessThan": "ef4b7c7046d29a67090de15af0da0d1ae8d1b192",
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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": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266",
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"lessThan": "fab820f1691a9e26d9031f18aae1e9ce09078f92",
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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": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266",
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"lessThan": "f463b6f4957c9c3fd1c75f8d3e5af4879fa609c0",
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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": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266",
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"lessThan": "e48e8edbef2eb824201495daa5234560f632b23c",
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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/core/xdp.c"
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],
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"versions": [
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{
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"version": "5.14",
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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": "5.14",
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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": "5.15.216",
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"lessThanOrEqual": "5.15.*",
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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": "6.1.183",
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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": "6.6.152",
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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": "6.12.104",
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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": "6.18.45",
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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": "7.1.9",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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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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"versionStartIncluding": "5.14",
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"versionEndExcluding": "5.15.216"
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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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"versionStartIncluding": "5.14",
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"versionEndExcluding": "6.1.183"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.14",
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"versionEndExcluding": "7.2"
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}
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/58408982fa39f9758124cec169f42854d6f98f35"
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},
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{
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"url": "https://git.kernel.org/stable/c/685edea27ac68d08fe4dbd3de74b858d2ad8e830"
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},
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{
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"url": "https://git.kernel.org/stable/c/ba13763d667e008e185fedf592d53846a5b457d1"
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},
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{
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"url": "https://git.kernel.org/stable/c/ef4b7c7046d29a67090de15af0da0d1ae8d1b192"
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},
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{
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"url": "https://git.kernel.org/stable/c/fab820f1691a9e26d9031f18aae1e9ce09078f92"
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},
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{
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"url": "https://git.kernel.org/stable/c/f463b6f4957c9c3fd1c75f8d3e5af4879fa609c0"
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},
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{
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"url": "https://git.kernel.org/stable/c/e48e8edbef2eb824201495daa5234560f632b23c"
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}
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],
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"title": "xdp: reject clones that overrun skb_shared_info tailroom",
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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-2026-74616",
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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": "yes"
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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": "2026-10-16T19:02:32.968446Z"
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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": "2026-10-16T19:06:02.219Z"
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}
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}
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]
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}
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} |