CVE-2024-53211
Vulnerability from cvelistv5
Published
2024-12-27 13:49
Modified
2024-12-27 13:49
Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
net/l2tp: fix warning in l2tp_exit_net found by syzbot
In l2tp's net exit handler, we check that an IDR is empty before
destroying it:
WARN_ON_ONCE(!idr_is_empty(&pn->l2tp_tunnel_idr));
idr_destroy(&pn->l2tp_tunnel_idr);
By forcing memory allocation failures in idr_alloc_32, syzbot is able
to provoke a condition where idr_is_empty returns false despite there
being no items in the IDR. This turns out to be because the radix tree
of the IDR contains only internal radix-tree nodes and it is this that
causes idr_is_empty to return false. The internal nodes are cleaned by
idr_destroy.
Use idr_for_each to check that the IDR is empty instead of
idr_is_empty to avoid the problem.
References
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/l2tp/l2tp_core.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "a487cc8986d6dd75b60b59004f3bd2ea9b4dd541",
"status": "affected",
"version": "73d33bd063c4cfef3db17f9bec3d202928ed8631",
"versionType": "git"
},
{
"lessThan": "5d066766c5f1252f98ff859265bcd1a5b52ac46c",
"status": "affected",
"version": "73d33bd063c4cfef3db17f9bec3d202928ed8631",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/l2tp/l2tp_core.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.12"
},
{
"lessThan": "6.12",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.13-rc1",
"versionType": "original_commit_for_fix"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/l2tp: fix warning in l2tp_exit_net found by syzbot\n\nIn l2tp\u0027s net exit handler, we check that an IDR is empty before\ndestroying it:\n\n\tWARN_ON_ONCE(!idr_is_empty(\u0026pn-\u003el2tp_tunnel_idr));\n\tidr_destroy(\u0026pn-\u003el2tp_tunnel_idr);\n\nBy forcing memory allocation failures in idr_alloc_32, syzbot is able\nto provoke a condition where idr_is_empty returns false despite there\nbeing no items in the IDR. This turns out to be because the radix tree\nof the IDR contains only internal radix-tree nodes and it is this that\ncauses idr_is_empty to return false. The internal nodes are cleaned by\nidr_destroy.\n\nUse idr_for_each to check that the IDR is empty instead of\nidr_is_empty to avoid the problem."
}
],
"providerMetadata": {
"dateUpdated": "2024-12-27T13:49:57.169Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/a487cc8986d6dd75b60b59004f3bd2ea9b4dd541"
},
{
"url": "https://git.kernel.org/stable/c/5d066766c5f1252f98ff859265bcd1a5b52ac46c"
}
],
"title": "net/l2tp: fix warning in l2tp_exit_net found by syzbot",
"x_generator": {
"engine": "bippy-5f407fcff5a0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-53211",
"datePublished": "2024-12-27T13:49:57.169Z",
"dateReserved": "2024-11-19T17:17:25.020Z",
"dateUpdated": "2024-12-27T13:49:57.169Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2024-53211\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-12-27T14:15:29.017\",\"lastModified\":\"2024-12-27T14:15:29.017\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/l2tp: fix warning in l2tp_exit_net found by syzbot\\n\\nIn l2tp\u0027s net exit handler, we check that an IDR is empty before\\ndestroying it:\\n\\n\\tWARN_ON_ONCE(!idr_is_empty(\u0026pn-\u003el2tp_tunnel_idr));\\n\\tidr_destroy(\u0026pn-\u003el2tp_tunnel_idr);\\n\\nBy forcing memory allocation failures in idr_alloc_32, syzbot is able\\nto provoke a condition where idr_is_empty returns false despite there\\nbeing no items in the IDR. This turns out to be because the radix tree\\nof the IDR contains only internal radix-tree nodes and it is this that\\ncauses idr_is_empty to return false. The internal nodes are cleaned by\\nidr_destroy.\\n\\nUse idr_for_each to check that the IDR is empty instead of\\nidr_is_empty to avoid the problem.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5d066766c5f1252f98ff859265bcd1a5b52ac46c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a487cc8986d6dd75b60b59004f3bd2ea9b4dd541\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
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- Confirmed: The vulnerability is confirmed from an analyst perspective.
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- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.