CVE-2021-47291 (GCVE-0-2021-47291)
Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-08-05 08:47
VLAI
EPSS
VEX
Title
ipv6: fix another slab-out-of-bounds in fib6_nh_flush_exceptions
Summary
In the Linux kernel, the following vulnerability has been resolved:
ipv6: fix another slab-out-of-bounds in fib6_nh_flush_exceptions
While running the self-tests on a KASAN enabled kernel, I observed a
slab-out-of-bounds splat very similar to the one reported in
commit 821bbf79fe46 ("ipv6: Fix KASAN: slab-out-of-bounds Read in
fib6_nh_flush_exceptions").
We additionally need to take care of fib6_metrics initialization
failure when the caller provides an nh.
The fix is similar, explicitly free the route instead of calling
fib6_info_release on a half-initialized object.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-08-19 18:51 UTC
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 , < 830251361425c5be044db4d826aaf304ea3d14c6
(git)
Affected: f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 , < ce8fafb68051fba52546f8bbe8621f7641683680 (git) Affected: f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 , < 115784bcccf135c3a3548098153413d76f16aae0 (git) Affected: f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 , < 8fb4792f091e608a0a1d353dfdf07ef55a719db5 (git) |
guessed | |
| Linux | Linux |
Affected:
5.3
Unaffected: 0 , < 5.3 (semver) Unaffected: 5.4.136 , ≤ 5.4.* (semver) Unaffected: 5.10.54 , ≤ 5.10.* (semver) Unaffected: 5.13.6 , ≤ 5.13.* (semver) Unaffected: 5.14 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-04T05:32:08.000Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/830251361425c5be044db4d826aaf304ea3d14c6"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/ce8fafb68051fba52546f8bbe8621f7641683680"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/115784bcccf135c3a3548098153413d76f16aae0"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/8fb4792f091e608a0a1d353dfdf07ef55a719db5"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2021-47291",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-08-19T18:51:27.837598Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2024-08-19T18:52:14.586Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/ipv6/route.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "830251361425c5be044db4d826aaf304ea3d14c6",
"status": "affected",
"version": "f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74",
"versionType": "git"
},
{
"lessThan": "ce8fafb68051fba52546f8bbe8621f7641683680",
"status": "affected",
"version": "f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74",
"versionType": "git"
},
{
"lessThan": "115784bcccf135c3a3548098153413d76f16aae0",
"status": "affected",
"version": "f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74",
"versionType": "git"
},
{
"lessThan": "8fb4792f091e608a0a1d353dfdf07ef55a719db5",
"status": "affected",
"version": "f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/ipv6/route.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.3"
},
{
"lessThan": "5.3",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.136",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.54",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.13.*",
"status": "unaffected",
"version": "5.13.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "5.14",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.4.136",
"versionStartIncluding": "5.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.54",
"versionStartIncluding": "5.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.13.6",
"versionStartIncluding": "5.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.14",
"versionStartIncluding": "5.3",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"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."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"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."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T08:47:07.127Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/830251361425c5be044db4d826aaf304ea3d14c6"
},
{
"url": "https://git.kernel.org/stable/c/ce8fafb68051fba52546f8bbe8621f7641683680"
},
{
"url": "https://git.kernel.org/stable/c/115784bcccf135c3a3548098153413d76f16aae0"
},
{
"url": "https://git.kernel.org/stable/c/8fb4792f091e608a0a1d353dfdf07ef55a719db5"
}
],
"title": "ipv6: fix another slab-out-of-bounds in fib6_nh_flush_exceptions",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2021-47291",
"datePublished": "2024-05-21T14:35:16.071Z",
"dateReserved": "2024-05-21T13:27:52.130Z",
"dateUpdated": "2026-08-05T08:47:07.127Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2021-47291",
"date": "2026-09-16",
"epss": "0.00247",
"percentile": "0.16211"
},
"fkie_nvd": {
"configurations": "[{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"5.3\", \"versionEndExcluding\": \"5.4.136\", \"matchCriteriaId\": \"CF5BD040-953A-4682-81D2-AC87F815A1D6\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"5.5\", \"versionEndExcluding\": \"5.10.54\", \"matchCriteriaId\": \"1BD5A2EE-859F-40FC-BDAC-167AAE37C870\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"5.11\", \"versionEndExcluding\": \"5.13.6\", \"matchCriteriaId\": \"512C22FC-1524-4E6F-9E62-4F4B7B6E0576\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:*\", \"matchCriteriaId\": \"71268287-21A8-4488-AA4F-23C473153131\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:5.14:rc2:*:*:*:*:*:*\", \"matchCriteriaId\": \"23B9E5C6-FAB5-4A02-9E39-27C8787B0991\"}]}]}]",
"descriptions": "[{\"lang\": \"en\", \"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.\"}, {\"lang\": \"es\", \"value\": \" En el kernel de Linux, se resolvi\\u00f3 la siguiente vulnerabilidad: ipv6: corrige otra slab fuera de los l\\u00edmites en fib6_nh_flush_exceptions. Mientras ejecutaba las autopruebas en un kernel habilitado para KASAN, observ\\u00e9 una slab fuera de los l\\u00edmites muy similar al informado en la confirmaci\\u00f3n 821bbf79fe46 (\\\"ipv6: Fix KASAN: slab-out-of-bounds Read in fib6_nh_flush_exceptions\\\"). Adem\\u00e1s, debemos ocuparnos del error de inicializaci\\u00f3n de fib6_metrics cuando la persona que llama proporciona un nh. La soluci\\u00f3n es similar: libera expl\\u00edcitamente la ruta en lugar de llamar a fib6_info_release en un objeto medio inicializado.\"}]",
"id": "CVE-2021-47291",
"lastModified": "2024-12-23T16:47:57.030",
"metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\", \"baseScore\": 7.1, \"baseSeverity\": \"HIGH\", \"attackVector\": \"LOCAL\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"LOW\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 1.8, \"impactScore\": 5.2}]}",
"published": "2024-05-21T15:15:17.100",
"references": "[{\"url\": \"https://git.kernel.org/stable/c/115784bcccf135c3a3548098153413d76f16aae0\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/830251361425c5be044db4d826aaf304ea3d14c6\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/8fb4792f091e608a0a1d353dfdf07ef55a719db5\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/ce8fafb68051fba52546f8bbe8621f7641683680\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/115784bcccf135c3a3548098153413d76f16aae0\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/830251361425c5be044db4d826aaf304ea3d14c6\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/8fb4792f091e608a0a1d353dfdf07ef55a719db5\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/ce8fafb68051fba52546f8bbe8621f7641683680\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}]",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-125\"}]}]"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2021-47291\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:17.100\",\"lastModified\":\"2026-08-04T10:16:56.613\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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.\"},{\"lang\":\"es\",\"value\":\" En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: ipv6: corrige otra slab fuera de los l\u00edmites en fib6_nh_flush_exceptions. Mientras ejecutaba las autopruebas en un kernel habilitado para KASAN, observ\u00e9 una slab fuera de los l\u00edmites muy similar al informado en la confirmaci\u00f3n 821bbf79fe46 (\\\"ipv6: Fix KASAN: slab-out-of-bounds Read in fib6_nh_flush_exceptions\\\"). Adem\u00e1s, debemos ocuparnos del error de inicializaci\u00f3n de fib6_metrics cuando la persona que llama proporciona un nh. La soluci\u00f3n es similar: libera expl\u00edcitamente la ruta en lugar de llamar a fib6_info_release en un objeto medio inicializado.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv6/route.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74\",\"lessThan\":\"830251361425c5be044db4d826aaf304ea3d14c6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74\",\"lessThan\":\"ce8fafb68051fba52546f8bbe8621f7641683680\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74\",\"lessThan\":\"115784bcccf135c3a3548098153413d76f16aae0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74\",\"lessThan\":\"8fb4792f091e608a0a1d353dfdf07ef55a719db5\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv6/route.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.3\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.3\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.136\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.54\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.13.6\",\"lessThanOrEqual\":\"5.13.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.14\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-08-19T18:51:27.837598Z\",\"id\":\"CVE-2021-47291\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.3\",\"versionEndExcluding\":\"5.4.136\",\"matchCriteriaId\":\"CF5BD040-953A-4682-81D2-AC87F815A1D6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.54\",\"matchCriteriaId\":\"1BD5A2EE-859F-40FC-BDAC-167AAE37C870\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.13.6\",\"matchCriteriaId\":\"512C22FC-1524-4E6F-9E62-4F4B7B6E0576\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"71268287-21A8-4488-AA4F-23C473153131\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.14:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"23B9E5C6-FAB5-4A02-9E39-27C8787B0991\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/115784bcccf135c3a3548098153413d76f16aae0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/830251361425c5be044db4d826aaf304ea3d14c6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8fb4792f091e608a0a1d353dfdf07ef55a719db5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ce8fafb68051fba52546f8bbe8621f7641683680\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/115784bcccf135c3a3548098153413d76f16aae0\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/830251361425c5be044db4d826aaf304ea3d14c6\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8fb4792f091e608a0a1d353dfdf07ef55a719db5\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ce8fafb68051fba52546f8bbe8621f7641683680\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-08-04T23:03:39+00:00",
"cve": "CVE-2021-47291",
"id": "CVE-2021-47291",
"initial_release_date": "2021-01-01T00:00:00+00:00",
"product_status:known_affected": "42",
"product_status:known_not_affected": "156",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: ipv6: fix another slab-out-of-bounds in fib6_nh_flush_exceptions",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47291.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-15T02:31:20Z",
"cve": "CVE-2021-47291",
"id": "CVE-2021-47291",
"initial_release_date": "2024-05-23T03:05:00Z",
"product_status:known_affected": "391",
"product_status:known_not_affected": "317",
"product_status:recommended": "198",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2021-47291",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47291.json",
"version": "57"
},
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/830251361425c5be044db4d826aaf304ea3d14c6\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/ce8fafb68051fba52546f8bbe8621f7641683680\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/115784bcccf135c3a3548098153413d76f16aae0\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/8fb4792f091e608a0a1d353dfdf07ef55a719db5\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:32:08.000Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47291\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-08-19T18:51:27.837598Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-08-19T18:52:11.686Z\"}}], \"cna\": {\"title\": \"ipv6: fix another slab-out-of-bounds in fib6_nh_flush_exceptions\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74\", \"lessThan\": \"830251361425c5be044db4d826aaf304ea3d14c6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74\", \"lessThan\": \"ce8fafb68051fba52546f8bbe8621f7641683680\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74\", \"lessThan\": \"115784bcccf135c3a3548098153413d76f16aae0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74\", \"lessThan\": \"8fb4792f091e608a0a1d353dfdf07ef55a719db5\", \"versionType\": \"git\"}], \"programFiles\": [\"net/ipv6/route.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.3\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.3\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.136\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.54\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.13.*\"}, {\"status\": \"unaffected\", \"version\": \"5.14\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ipv6/route.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/830251361425c5be044db4d826aaf304ea3d14c6\"}, {\"url\": \"https://git.kernel.org/stable/c/ce8fafb68051fba52546f8bbe8621f7641683680\"}, {\"url\": \"https://git.kernel.org/stable/c/115784bcccf135c3a3548098153413d76f16aae0\"}, {\"url\": \"https://git.kernel.org/stable/c/8fb4792f091e608a0a1d353dfdf07ef55a719db5\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.136\", \"versionStartIncluding\": \"5.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.54\", \"versionStartIncluding\": \"5.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13.6\", \"versionStartIncluding\": \"5.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14\", \"versionStartIncluding\": \"5.3\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:47:07.127Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2021-47291\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T08:47:07.127Z\", \"dateReserved\": \"2024-05-21T13:27:52.130Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:35:16.071Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…