305 lines
15 KiB
JSON
305 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-2023-53338",
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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": "2025-09-16T16:08:59.565Z",
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"datePublished": "2025-09-17T14:56:32.302Z",
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"dateUpdated": "2026-08-05T09:13:35.491Z"
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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": "2026-08-05T09:13:35.491Z"
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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\nlwt: Fix return values of BPF xmit ops\n\nBPF encap ops can return different types of positive values, such like\nNET_RX_DROP, NET_XMIT_CN, NETDEV_TX_BUSY, and so on, from function\nskb_do_redirect and bpf_lwt_xmit_reroute. At the xmit hook, such return\nvalues would be treated implicitly as LWTUNNEL_XMIT_CONTINUE in\nip(6)_finish_output2. When this happens, skbs that have been freed would\ncontinue to the neighbor subsystem, causing use-after-free bug and\nkernel crashes.\n\nTo fix the incorrect behavior, skb_do_redirect return values can be\nsimply discarded, the same as tc-egress behavior. On the other hand,\nbpf_lwt_xmit_reroute returns useful errors to local senders, e.g. PMTU\ninformation. Thus convert its return values to avoid the conflict with\nLWTUNNEL_XMIT_CONTINUE."
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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 - On hosts with LWT BPF xmit routes (e.g. edge/CDN forwarders), remote packets that are forwarded or that induce local replies reach ip(6)_finish_output2 → lwtunnel_xmit → bpf_xmit, so an unauthenticated network peer drives the vulnerable path.\nAC:L - LWT BPF xmit programs routinely return BPF_REDIRECT or BPF_LWT_REROUTE; skb_do_redirect/dst_output then yield positive NET_XMIT_*/NETDEV_TX_* statuses (e.g. NET_XMIT_CN under load) that the attacker can provoke by sending traffic, with no condition outside their control.\nPR:N - Once an LWT BPF xmit route is configured, no credentials are required—any remote peer whose packets traverse that route reaches the bug; local unprivileged traffic generation likewise needs no elevated privileges.\nUI:N - Exploitation requires only attacker-generated traffic against an already-configured LWT BPF route; no victim or administrator action is needed at exploit time.\nS:U - The use-after-free and any resulting privilege escalation remain within the host kernel's security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The bug is a use-after-free of a consumed skb that continues into the neighbor subsystem; reclaiming and spraying that object enables arbitrary kernel memory disclosure.\nI:H - The same skb UAF in neigh_output provides heap corruption suitable for arbitrary write and control-flow hijack, i.e. full kernel integrity compromise.\nA:H - Continuing a freed skb into neigh_output reliably causes kernel oops/panic, as documented in the fix and reproduced by the LWT redirect selftests."
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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/lwt_bpf.c"
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],
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"versions": [
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{
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"version": "3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2",
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"lessThan": "67f8f2bae8e7ac72e09def2b667e44704c4d1ee1",
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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": "3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2",
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"lessThan": "a97f221651fcdc891166e9bc270e3d9bfa5a0080",
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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": "3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2",
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"lessThan": "e3f647e4b642f9f6d32795a16f92c116c138d2af",
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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": "3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2",
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"lessThan": "065d5f17096ec9161180e2c890afdff4dc6125f2",
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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": "3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2",
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"lessThan": "d68c17402442f5f494a2c3ebde5cb82f6aa9160a",
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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": "3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2",
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"lessThan": "65583f9e070db7bece20710cfa2e3daeb0b831d9",
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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": "3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2",
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"lessThan": "29b22badb7a84b783e3a4fffca16f7768fb31205",
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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/lwt_bpf.c"
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],
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"versions": [
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{
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"version": "4.10",
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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": "4.10",
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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": "5.4.257",
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"lessThanOrEqual": "5.4.*",
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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": "5.10.195",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.132",
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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": "6.1.53",
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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": "6.4.16",
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"lessThanOrEqual": "6.4.*",
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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": "6.5.3",
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"lessThanOrEqual": "6.5.*",
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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",
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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": "4.10",
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"versionEndExcluding": "5.4.257"
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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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]
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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/67f8f2bae8e7ac72e09def2b667e44704c4d1ee1"
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},
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{
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"url": "https://git.kernel.org/stable/c/a97f221651fcdc891166e9bc270e3d9bfa5a0080"
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},
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{
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"url": "https://git.kernel.org/stable/c/e3f647e4b642f9f6d32795a16f92c116c138d2af"
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},
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{
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"url": "https://git.kernel.org/stable/c/065d5f17096ec9161180e2c890afdff4dc6125f2"
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},
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{
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"url": "https://git.kernel.org/stable/c/d68c17402442f5f494a2c3ebde5cb82f6aa9160a"
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},
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{
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"url": "https://git.kernel.org/stable/c/65583f9e070db7bece20710cfa2e3daeb0b831d9"
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},
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{
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"url": "https://git.kernel.org/stable/c/29b22badb7a84b783e3a4fffca16f7768fb31205"
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}
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],
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"title": "lwt: Fix return values of BPF xmit ops",
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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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"cvssV3_1": {
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"scope": "UNCHANGED",
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"version": "3.1",
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"baseScore": 7.8,
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"attackVector": "LOCAL",
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"baseSeverity": "HIGH",
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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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"integrityImpact": "HIGH",
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"userInteraction": "NONE",
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"attackComplexity": "LOW",
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"availabilityImpact": "HIGH",
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"privilegesRequired": "LOW",
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"confidentialityImpact": "HIGH"
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}
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},
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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-2023-53338",
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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": "2026-01-14T18:38:11.999922Z"
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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-416",
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"description": "CWE-416 Use After Free"
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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": "2026-01-14T18:43:01.329Z"
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}
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}
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]
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}
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} |