275 lines
14 KiB
JSON
275 lines
14 KiB
JSON
{
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"cveId": "CVE-2021-47243",
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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": "2024-04-10T18:59:19.532Z",
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"datePublished": "2024-05-21T14:19:42.309Z",
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"dateUpdated": "2026-08-05T08:46:54.221Z"
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},
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:46:54.221Z"
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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\nsch_cake: Fix out of bounds when parsing TCP options and header\n\nThe TCP option parser in cake qdisc (cake_get_tcpopt and\ncake_tcph_may_drop) could read one byte out of bounds. When the length\nis 1, the execution flow gets into the loop, reads one byte of the\nopcode, and if the opcode is neither TCPOPT_EOL nor TCPOPT_NOP, it reads\none more byte, which exceeds the length of 1.\n\nThis fix is inspired by commit 9609dad263f8 (\"ipv4: tcp_input: fix stack\nout of bounds when parsing TCP options.\").\n\nv2 changes:\n\nAdded doff validation in cake_get_tcphdr to avoid parsing garbage as TCP\nheader. Although it wasn't strictly an out-of-bounds access (memory was\nallocated), garbage values could be read where CAKE expected the TCP\nheader if doff was smaller than 5."
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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:N/A:H",
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"baseScore": 7.1,
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"baseSeverity": "HIGH"
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},
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{
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"lang": "en",
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"value": "AV:L - The vulnerable TCP option parsers run in the CAKE qdisc (net/sched) during enqueue after the qdisc is attached via tc/netlink; qdisc bugs are local, and an attacker reaches them by configuring cake in a netns and sending crafted packets through it.\nAC:L - The attacker fully controls qdisc setup (enabling ack_filter) and the TCP option bytes that trigger the length==1 path, so the one-byte out-of-bounds read is reliably reproducible with no conditions outside attacker control.\nPR:L - Creating/changing the cake qdisc requires CAP_NET_ADMIN, but that capability is obtainable in an unprivileged user namespace via netlink_net_capable(sock_net()->user_ns), so only low privileges are required.\nUI:N - No victim interaction is needed; the attacker configures the qdisc and injects the crafted TCP packets themselves.\nS:U - Impact remains within the same kernel/host security authority; this is not a VM escape, IOMMU bypass, or other cross-boundary breakout.\nC:H - The bug is an out-of-bounds read of adjacent skb/stack memory past the TCP options; per scoring guidance OOB reads are treated as high confidentiality impact when they may expose adjacent kernel memory.\nI:N - The out-of-bounds access is a read only; the byte is used solely as opsize and then rejected by the existing bounds check, with no write primitive or controllable data modification.\nA:H - Reading one byte past valid packet/header data can fault when that address is unmapped or otherwise invalid, causing a kernel oops/panic and full availability loss."
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}
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]
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}
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],
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"version": "0",
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"status": "unaffected",
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"version": "4.19.196",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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{
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"version": "5.12.13",
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"lessThanOrEqual": "5.12.*",
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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": "5.13",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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