248 lines
12 KiB
JSON
248 lines
12 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-2021-47291",
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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": "2024-05-21T13:27:52.130Z",
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"datePublished": "2024-05-21T14:35:16.071Z",
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"dateUpdated": "2026-08-05T08:47:07.127Z"
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},
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:47:07.127Z"
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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\nipv6: fix another slab-out-of-bounds in fib6_nh_flush_exceptions\n\nWhile running the self-tests on a KASAN enabled kernel, I observed a\nslab-out-of-bounds splat very similar to the one reported in\ncommit 821bbf79fe46 (\"ipv6: Fix KASAN: slab-out-of-bounds Read in\n fib6_nh_flush_exceptions\").\n\nWe additionally need to take care of fib6_metrics initialization\nfailure when the caller provides an nh.\n\nThe fix is similar, explicitly free the route instead of calling\nfib6_info_release on a half-initialized object."
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}
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],
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"metrics": [
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{
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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 - Triggered via local rtnetlink (RTM_NEWNEXTHOP then RTM_NEWROUTE with RTA_NH_ID and invalid RTA_METRICS) or ipv6 route ioctl, not by processing remote packets.\nAC:L - Reliably triggered with a crafted nexthop plus an IPv6 route using that nhid and invalid metrics (e.g. unknown congctl), as covered by the fib_nexthops selftest; no race or attacker-uncontrollable condition.\nPR:L - RTM_NEWROUTE/RTM_NEWNEXTHOP require CAP_NET_ADMIN via netlink_net_capable against the netns user_ns, which an unprivileged process obtains in a user+network namespace (unshare -Urn).\nUI:N - Exploitation needs only attacker-issued netlink messages; no victim action is required.\nS:U - Memory corruption stays within the host kernel authority; this is not a VM escape, IOMMU bypass, or other cross-boundary impact.\nC:H - fib6_nh_flush_exceptions performs a slab out-of-bounds read of adjacent heap when releasing a fib6_info allocated without an embedded fib6_nh, which can disclose or leverage neighboring object contents.\nI:H - fib6_nh_release continues from the OOB data into pointer writes, kfree/free_percpu, and fib_nh_common_release on the unallocated fib6_nh region, yielding heap free/write primitives under attacker-influenced adjacent slab layout.\nA:H - The OOB access and subsequent invalid frees/puts on garbage pointers can oops, panic, or otherwise crash the kernel."
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}
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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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"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/ipv6/route.c"
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],
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"programFiles": [
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"net/ipv6/route.c"
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],
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"versions": [
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{
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"version": "5.3",
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"version": "0",
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"version": "5.4.136",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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},
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{
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"version": "5.10.54",
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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": "5.13.6",
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"lessThanOrEqual": "5.13.*",
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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": "5.14",
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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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