GHSA-522V-VW33-WCV7
Vulnerability from github – Published: 2024-10-21 12:30 – Updated: 2025-11-04 00:31In the Linux kernel, the following vulnerability has been resolved:
icmp: change the order of rate limits
ICMP messages are ratelimited :
After the blamed commits, the two rate limiters are applied in this order:
1) host wide ratelimit (icmp_global_allow())
2) Per destination ratelimit (inetpeer based)
In order to avoid side-channels attacks, we need to apply the per destination check first.
This patch makes the following change :
1) icmp_global_allow() checks if the host wide limit is reached. But credits are not yet consumed. This is deferred to 3)
2) The per destination limit is checked/updated. This might add a new node in inetpeer tree.
3) icmp_global_consume() consumes tokens if prior operations succeeded.
This means that host wide ratelimit is still effective in keeping inetpeer tree small even under DDOS.
As a bonus, I removed icmp_global.lock as the fast path can use a lock-free operation.
{
"affected": [],
"aliases": [
"CVE-2024-47678"
],
"database_specific": {
"cwe_ids": [
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-10-21T12:15:04Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nicmp: change the order of rate limits\n\nICMP messages are ratelimited :\n\nAfter the blamed commits, the two rate limiters are applied in this order:\n\n1) host wide ratelimit (icmp_global_allow())\n\n2) Per destination ratelimit (inetpeer based)\n\nIn order to avoid side-channels attacks, we need to apply\nthe per destination check first.\n\nThis patch makes the following change :\n\n1) icmp_global_allow() checks if the host wide limit is reached.\n But credits are not yet consumed. This is deferred to 3)\n\n2) The per destination limit is checked/updated.\n This might add a new node in inetpeer tree.\n\n3) icmp_global_consume() consumes tokens if prior operations succeeded.\n\nThis means that host wide ratelimit is still effective\nin keeping inetpeer tree small even under DDOS.\n\nAs a bonus, I removed icmp_global.lock as the fast path\ncan use a lock-free operation.",
"id": "GHSA-522v-vw33-wcv7",
"modified": "2025-11-04T00:31:35Z",
"published": "2024-10-21T12:30:54Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-47678"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/483397b4ba280813e4a9c161a0a85172ddb43d19"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/662ec52260cc07b9ae53ecd3925183c29d34288b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8c2bd38b95f75f3d2a08c93e35303e26d480d24e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/997ba8889611891f91e8ad83583466aeab6239a3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a7722921adb046e3836eb84372241f32584bdb07"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
}
]
}
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|---|
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