278 lines
14 KiB
JSON
278 lines
14 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-2024-46865",
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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": "2024-09-11T15:12:18.294Z",
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"datePublished": "2024-09-27T12:42:53.691Z",
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"dateUpdated": "2026-10-15T00:50:58.578Z"
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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": "2026-08-05T11:39:07.502Z"
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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\nfou: fix initialization of grc\n\nThe grc must be initialize first. There can be a condition where if\nfou is NULL, goto out will be executed and grc would be used\nuninitialized."
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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 - The vulnerable code is the GUE/FOU GRO receive handler, reached purely from an inbound UDP datagram addressed to the configured FOU port via napi_gro_receive → inet_gro_receive → udp4_gro_receive → gue_gro_receive. A remote attacker anywhere on the network can drive this path with crafted packets.\nAC:L - The attacker can flood the FOU port continuously so a packet is always in flight, and FOU/netns teardown (the window where sk_user_data is NULL) is routine, frequent churn on container and cloud hosts that use FOU-encapsulated tunnels. The attacker also controls the value in the uninitialized stack slot by first sending a GUE packet with GUE_PFLAG_REMCSUM, which stores attacker-derived offset/delta into that exact frame slot in the same function.\nPR:N - There is no authentication, credential check, or capability test anywhere between packet reception and gue_gro_receive; the FOU socket accepts unsolicited datagrams. No local account or privilege of any kind is required.\nUI:N - Exploitation occurs entirely in softirq context on packet receipt with no victim action required.\nS:U - The uninitialized-value use and the resulting write both occur within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The bug reads uninitialized kernel stack memory and folds it into a 16-bit value written into an in-flight network buffer, and the same defect provides an out-of-bounds write primitive at a partially attacker-influenced offset, which under kernel scoring practice is treated as leverageable for arbitrary memory disclosure.\nI:H - remcsum_unadjust() performs a 2-byte write through a pointer computed from the uninitialized (and attacker-groomable) grc->offset; when the size_t arithmetic wraps the write lands far outside any legitimate buffer, giving an out-of-bounds write into kernel memory that can be leveraged for control-flow-relevant corruption.\nA:H - The wild-pointer 2-byte write at frag0 + ~4GiB faults on unmapped kernel memory and oopses in softirq context, and the surrounding corruption of GRO/checksum state destabilises the receive path — a remote unauthenticated kernel crash."
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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/fou_core.c"
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{
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"version": "5.10.226",
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"lessThan": "6.10.11",
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"cpeApplicability": [
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"content": {
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"timestamp": "2024-09-29T13:42:07.132296Z",
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"id": "CVE-2024-46865",
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"dateUpdated": "2024-09-29T13:43:27.114Z"
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"title": "CVE Program Container",
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"references": [
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"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
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"vendor": "Siemens",
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"product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
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"versions": [
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