316 lines
17 KiB
JSON
316 lines
17 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-2026-63830",
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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": "2026-07-19T07:54:57.014Z",
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"datePublished": "2026-07-19T12:02:23.741Z",
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"dateUpdated": "2026-10-19T20:07:49.188Z"
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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": "2026-08-17T04:51:39.075Z"
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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\nnet: skmsg: preserve sg.copy across SG transforms\n\nThe sk_msg sg.copy bitmap is part of the scatterlist entry ownership\nstate. A set bit tells sk_msg_compute_data_pointers() not to expose the\nentry through writable BPF ctx->data. This protects entries backed by\npages that are not private to the sk_msg, such as splice-backed file\npage-cache pages.\n\nSeveral sk_msg transform paths move, copy, split, or compact\nmsg->sg.data[] entries without moving the matching sg.copy bit. This can\nmake an externally backed entry arrive at a new slot with a clear copy\nbit. A later SK_MSG verdict can then expose sg_virt(sge) as writable\nctx->data and BPF stores can modify the original page cache.\n\nKeep sg.copy synchronized with sg.data[] whenever entries are\ntransferred, shifted, split, or copied into a new sk_msg. Clear the bit\nwhen an entry is replaced by a newly allocated private page or freed.\nThis covers the BPF pull/push/pop helpers, sk_msg_shift_left/right(),\nsk_msg_xfer(), and tls_split_open_record(), including the partial tail\nentry created during TLS open-record splitting."
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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:L",
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"baseScore": 9.4,
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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 - The bug is exercised on the kTLS/TCP send path when splice-backed page-cache pages in an sk_msg are processed by an SK_MSG BPF verdict on network sockets; a remote TLS peer can trigger this on internet-facing servers (HTTPS, service-mesh edge nodes) that serve file-backed responses via splice/sendfile.\nAC:L - The attacker controls the traffic patterns, message sizes, and splice-backed data needed to hit the desynchronized transform paths (bpf_msg_push/pop/pull, sk_msg shift/xfer, tls_split_open_record); no race against unrelated system state is required.\nPR:N - On production kTLS servers with an attached SK_MSG BPF program (common in Cilium/Cloudflare-class deployments), an unauthenticated remote peer can trigger the faulty transforms without any credentials on the victim; a fully local exploit via user-namespace CAP_NET_ADMIN is also possible but is not the highest-severity case.\nUI:N - Exploitation requires only network traffic to a vulnerable server (or local socket I/O); no victim user action such as opening a file or mounting a filesystem is needed beyond normal server operation.\nS:U - Impact remains within the kernel's security authority (page-cache corruption via the network/BPF stack); it does not cross a VM-hypervisor or IOMMU boundary even though corrupted cache pages may affect other processes.\nC:H - Exposing splice-backed page-cache pages as writable BPF ctx->data gives the attacker a kernel memory write primitive over shared file cache pages, which can be leveraged to read or infer sensitive file contents served from or mapped through the corrupted pages.\nI:H - The commit explicitly states BPF stores through the incorrectly writable ctx->data can modify the original page cache, constituting arbitrary integrity corruption of file-backed data beyond the socket buffer.\nA:L - While the primary impact is data corruption rather than a kernel oops, corrupting shared page-cache pages of files actively served to other clients can cause sustained service disruption and repeated application-level failures; when uncertain, availability impact above None is appropriate."
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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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"include/linux/skmsg.h",
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"net/core/filter.c",
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"net/core/skmsg.c",
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"net/tls/tls_sw.c"
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],
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"versions": [
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{
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"version": "d3b18ad31f93d0b6bae105c679018a1ba7daa9ca",
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"lessThan": "f126eed589eec6f201405abbc398844042ef6d57",
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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": "d3b18ad31f93d0b6bae105c679018a1ba7daa9ca",
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"lessThan": "31a110642b5fb5e61940cbcfb503445ac4f28017",
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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": "d3b18ad31f93d0b6bae105c679018a1ba7daa9ca",
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"lessThan": "9bb86d8184b37503816150c4a6ad3c17dfdbe827",
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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": "d3b18ad31f93d0b6bae105c679018a1ba7daa9ca",
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"lessThan": "0eb4c16c4adb262763bda870a8ed38a1a9dec7ec",
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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": "d3b18ad31f93d0b6bae105c679018a1ba7daa9ca",
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"lessThan": "d22cc92bc41290e5783a72375e0843d9435f6001",
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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": "d3b18ad31f93d0b6bae105c679018a1ba7daa9ca",
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"lessThan": "1acdd14c0990dd1cd4b6534f00366d2e6dfce05f",
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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": "d3b18ad31f93d0b6bae105c679018a1ba7daa9ca",
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"lessThan": "21ed9540a8e1906dfcbc1bb82ba9b4de4fa4bd6d",
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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": "d3b18ad31f93d0b6bae105c679018a1ba7daa9ca",
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"lessThan": "406e8a651a7b854c41fecd5117bb282b3a6c2c6b",
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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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"include/linux/skmsg.h",
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"net/core/filter.c",
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"net/core/skmsg.c",
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"net/tls/tls_sw.c"
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],
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"versions": [
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{
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"version": "4.20",
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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": "4.20",
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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": "5.10.261",
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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": "5.15.212",
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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": "6.1.177",
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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": "6.6.144",
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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": "6.12.95",
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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": "6.18.38",
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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": "7.1.3",
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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": "4.20",
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"versionEndExcluding": "5.10.261"
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/f126eed589eec6f201405abbc398844042ef6d57"
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},
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{
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"url": "https://git.kernel.org/stable/c/31a110642b5fb5e61940cbcfb503445ac4f28017"
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},
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{
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"url": "https://git.kernel.org/stable/c/9bb86d8184b37503816150c4a6ad3c17dfdbe827"
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},
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{
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"url": "https://git.kernel.org/stable/c/0eb4c16c4adb262763bda870a8ed38a1a9dec7ec"
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},
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{
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"url": "https://git.kernel.org/stable/c/d22cc92bc41290e5783a72375e0843d9435f6001"
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},
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{
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"url": "https://git.kernel.org/stable/c/1acdd14c0990dd1cd4b6534f00366d2e6dfce05f"
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},
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{
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"url": "https://git.kernel.org/stable/c/21ed9540a8e1906dfcbc1bb82ba9b4de4fa4bd6d"
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},
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{
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"url": "https://git.kernel.org/stable/c/406e8a651a7b854c41fecd5117bb282b3a6c2c6b"
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}
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],
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"title": "net: skmsg: preserve sg.copy across SG transforms",
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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-2026-63830",
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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": "2026-10-16T15:31:17.853447Z"
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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-269",
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"description": "CWE-269 Improper Privilege Management"
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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": "2026-10-19T20:07:49.188Z"
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}
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}
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]
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}
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} |