263 lines
13 KiB
JSON
263 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-2021-47669",
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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": "2025-04-16T07:16:05.752Z",
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"datePublished": "2025-04-17T18:01:29.979Z",
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"dateUpdated": "2026-08-05T08:48:49.266Z"
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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": "2026-08-05T08:48:49.266Z"
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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\ncan: vxcan: vxcan_xmit: fix use after free bug\n\nAfter calling netif_rx_ni(skb), dereferencing skb is unsafe.\nEspecially, the canfd_frame cfd which aliases skb memory is accessed\nafter the netif_rx_ni()."
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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 bug is in vxcan_xmit, reached by sending a CAN frame on a virtual vxcan interface via PF_CAN/SOCK_RAW and RTNL setup—local syscalls/netlink only, not remote packet processing.\nAC:L - netif_rx_ni() runs softirq immediately and can_receive() always consume_skb()s the delivered frame, so the post-rx cfd->len access is a reliable use-after-free with no race or uncontrolled condition.\nPR:L - Creating/bringing up vxcan requires CAP_NET_ADMIN, which an unprivileged user obtains via user+network namespaces (unshare -Urn); sending on an existing up interface needs no capability.\nUI:N - The attacker creates the vxcan pair, brings it up, and sends frames entirely on their own—no victim interaction is required.\nS:U - Impact is confined to the local kernel (memory corruption / privilege escalation within the same security authority); this is not a VM/IOMMU/sandbox boundary escape.\nC:H - This is a use-after-free of skb data after delivery; a dangling read of freed heap enables disclosure of reclaimed object contents (including via stats that incorporate the stale byte).\nI:H - Use-after-free of the skb data buffer is exploitable via heap reuse/spray for corruption and control-flow hijacking primitives beyond the immediate stats update.\nA:H - Dereferencing freed skb data can oops/panic the kernel when the page is reclaimed or unmapped, and UAF faults are reliably triggerable on the success 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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"drivers/net/can/vxcan.c"
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],
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"versions": [
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{
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"version": "a8f820a380a2a06fc4fe1a54159067958f800929",
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"lessThan": "6d6dcf2399cdd26f7f5426ca8dd8366b7f2ca105",
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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": "a8f820a380a2a06fc4fe1a54159067958f800929",
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"lessThan": "9b820875a32a3443d67bfd368e93038354e98052",
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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": "a8f820a380a2a06fc4fe1a54159067958f800929",
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"lessThan": "a24476b37167816e6352ca1a2cf3769847774f70",
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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": "a8f820a380a2a06fc4fe1a54159067958f800929",
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"lessThan": "e771a874076115df8bff27d325edfd2340e4ec69",
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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": "a8f820a380a2a06fc4fe1a54159067958f800929",
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"lessThan": "75854cad5d80976f6ea0f0431f8cedd3bcc475cb",
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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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"drivers/net/can/vxcan.c"
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],
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"versions": [
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{
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"version": "4.12",
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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": "4.12",
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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": "4.14.218",
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"lessThanOrEqual": "4.14.*",
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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": "4.19.171",
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"lessThanOrEqual": "4.19.*",
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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": "5.4.93",
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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": "5.10.11",
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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": "5.11",
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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": "4.12",
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"versionEndExcluding": "4.14.218"
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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": "4.12",
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"versionEndExcluding": "4.19.171"
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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": "4.12",
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"versionEndExcluding": "5.4.93"
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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": "4.12",
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"versionEndExcluding": "5.10.11"
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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": "4.12",
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"versionEndExcluding": "5.11"
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}
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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/6d6dcf2399cdd26f7f5426ca8dd8366b7f2ca105"
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},
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{
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"url": "https://git.kernel.org/stable/c/9b820875a32a3443d67bfd368e93038354e98052"
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},
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{
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"url": "https://git.kernel.org/stable/c/a24476b37167816e6352ca1a2cf3769847774f70"
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},
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{
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"url": "https://git.kernel.org/stable/c/e771a874076115df8bff27d325edfd2340e4ec69"
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},
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{
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"url": "https://git.kernel.org/stable/c/75854cad5d80976f6ea0f0431f8cedd3bcc475cb"
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}
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],
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"title": "can: vxcan: vxcan_xmit: fix use after free bug",
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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-2021-47669",
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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": "2025-04-17T18:17:52.149604Z"
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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": "2025-04-17T18:25:25.277Z"
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}
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}
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]
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}
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} |