248 lines
13 KiB
JSON
248 lines
13 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-2024-49978",
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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": "2024-10-21T12:17:06.052Z",
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"datePublished": "2024-10-21T18:02:25.151Z",
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"dateUpdated": "2026-08-05T11:40:48.306Z"
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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": "2026-08-05T11:40:48.306Z"
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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\ngso: fix udp gso fraglist segmentation after pull from frag_list\n\nDetect gso fraglist skbs with corrupted geometry (see below) and\npass these to skb_segment instead of skb_segment_list, as the first\ncan segment them correctly.\n\nValid SKB_GSO_FRAGLIST skbs\n- consist of two or more segments\n- the head_skb holds the protocol headers plus first gso_size\n- one or more frag_list skbs hold exactly one segment\n- all but the last must be gso_size\n\nOptional datapath hooks such as NAT and BPF (bpf_skb_pull_data) can\nmodify these skbs, breaking these invariants.\n\nIn extreme cases they pull all data into skb linear. For UDP, this\ncauses a NULL ptr deref in __udpv4_gso_segment_list_csum at\nudp_hdr(seg->next)->dest.\n\nDetect invalid geometry due to pull, by checking head_skb size.\nDon't just drop, as this may blackhole a destination. Convert to be\nable to pass to regular skb_segment."
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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:N/I:N/A:H",
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"baseScore": 7.5,
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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:N - The vulnerable code is reached entirely by processing UDP packets received from the network and re-emitted on the IP forwarding path (ip_rcv → ip_forward → GSO segmentation), with no local access required. A remote, multi-hop attacker sending a burst of routed UDP datagrams through a Linux router/NAT gateway or tethering device triggers it.\nAC:L - On an affected device (GRO fraglist enabled plus a UDP NAT helper or tc/BPF program that pulls data), the attacker simply sends back-to-back UDP packets of the same flow; GRO coalescing and the subsequent full linearize occur deterministically, with no race to win and no memory layout to groom.\nPR:N - The packets are handled in the forwarding/softirq path before any authentication or authorization; the attacker needs no account, credentials, or privileges on the target at all.\nUI:N - Segmentation happens automatically as the kernel forwards attacker-supplied packets out of the egress device; no action by any local user or administrator is needed.\nS:U - The NULL dereference crashes the kernel that owns the vulnerable network stack, so the vulnerable and impacted components share the same security authority with no boundary crossed.\nC:N - The defect is a read of a fixed low address derived from a NULL sk_buff pointer (udp_hdr(seg->next)->dest); there is no attacker-controlled offset, no out-of-bounds read of valid memory, and no data returned to the attacker.\nI:N - Execution faults on the comparison before any write occurs in __udpv4_gso_segment_csum, so no kernel memory, packet data, or control flow is modified.\nA:H - The NULL pointer dereference occurs in softirq/NAPI context, producing an oops that Linux escalates to a full kernel panic (\"fatal exception in interrupt\"), and it can be re-triggered at will by resending UDP traffic."
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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/ipv4/udp_offload.c"
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],
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"versions": [
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{
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"version": "9fd1ff5d2ac7181844735806b0a703c942365291",
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"lessThan": "080e6c9a3908de193a48f646c5ce1bfb15676ffc",
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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": "9fd1ff5d2ac7181844735806b0a703c942365291",
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"lessThan": "af3122f5fdc0d00581d6e598a668df6bf54c9daa",
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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": "9fd1ff5d2ac7181844735806b0a703c942365291",
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"lessThan": "33e28acf42ee863f332a958bfc2f1a284a3659df",
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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": "9fd1ff5d2ac7181844735806b0a703c942365291",
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"lessThan": "3cd00d2e3655fad3bda96dc1ebf17b6495f86fea",
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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": "9fd1ff5d2ac7181844735806b0a703c942365291",
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"lessThan": "a1e40ac5b5e9077fe1f7ae0eb88034db0f9ae1ab",
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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/ipv4/udp_offload.c"
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],
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"versions": [
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{
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"version": "5.6",
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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": "5.6",
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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": "6.1.113",
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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": "6.6.55",
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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": "6.10.14",
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"lessThanOrEqual": "6.10.*",
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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": "6.11.3",
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"lessThanOrEqual": "6.11.*",
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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",
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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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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.6",
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"versionEndExcluding": "6.1.113"
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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": "5.6",
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"versionEndExcluding": "6.6.55"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.6",
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"versionEndExcluding": "6.12"
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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/080e6c9a3908de193a48f646c5ce1bfb15676ffc"
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},
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{
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"url": "https://git.kernel.org/stable/c/af3122f5fdc0d00581d6e598a668df6bf54c9daa"
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},
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{
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"url": "https://git.kernel.org/stable/c/33e28acf42ee863f332a958bfc2f1a284a3659df"
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},
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{
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"url": "https://git.kernel.org/stable/c/3cd00d2e3655fad3bda96dc1ebf17b6495f86fea"
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},
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{
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"url": "https://git.kernel.org/stable/c/a1e40ac5b5e9077fe1f7ae0eb88034db0f9ae1ab"
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}
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],
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"title": "gso: fix udp gso fraglist segmentation after pull from frag_list",
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"x_generator": {
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"engine": "bippy-1.2.0"
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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-2024-49978",
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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": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2024-10-22T13:32:53.403446Z"
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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": "2024-10-22T13:38:44.845Z"
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}
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},
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{
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
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"dateUpdated": "2025-11-03T22:23:59.132Z"
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}
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} |