ghsa-wx74-4w24-9hwf
Vulnerability from github
Published
2025-05-01 15:31
Modified
2025-05-01 15:31
Details
In the Linux kernel, the following vulnerability has been resolved:
netfilter: ipset: enforce documented limit to prevent allocating huge memory
Daniel Xu reported that the hash:net,iface type of the ipset subsystem does not limit adding the same network with different interfaces to a set, which can lead to huge memory usage or allocation failure.
The quick reproducer is
$ ipset create ACL.IN.ALL_PERMIT hash:net,iface hashsize 1048576 timeout 0 $ for i in $(seq 0 100); do /sbin/ipset add ACL.IN.ALL_PERMIT 0.0.0.0/0,kaf_$i timeout 0 -exist; done
The backtrace when vmalloc fails:
[Tue Oct 25 00:13:08 2022] ipset: vmalloc error: size 1073741848, exceeds total pages
<...>
[Tue Oct 25 00:13:08 2022] Call Trace:
[Tue Oct 25 00:13:08 2022] <TASK>
[Tue Oct 25 00:13:08 2022] dump_stack_lvl+0x48/0x60
[Tue Oct 25 00:13:08 2022] warn_alloc+0x155/0x180
[Tue Oct 25 00:13:08 2022] __vmalloc_node_range+0x72a/0x760
[Tue Oct 25 00:13:08 2022] ? hash_netiface4_add+0x7c0/0xb20
[Tue Oct 25 00:13:08 2022] ? __kmalloc_large_node+0x4a/0x90
[Tue Oct 25 00:13:08 2022] kvmalloc_node+0xa6/0xd0
[Tue Oct 25 00:13:08 2022] ? hash_netiface4_resize+0x99/0x710
<...>
The fix is to enforce the limit documented in the ipset(8) manpage:
The internal restriction of the hash:net,iface set type is that the same network prefix cannot be stored with more than 64 different interfaces in a single set.
{
"affected": [],
"aliases": [
"CVE-2022-49911"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-05-01T15:16:16Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ipset: enforce documented limit to prevent allocating huge memory\n\nDaniel Xu reported that the hash:net,iface type of the ipset subsystem does\nnot limit adding the same network with different interfaces to a set, which\ncan lead to huge memory usage or allocation failure.\n\nThe quick reproducer is\n\n$ ipset create ACL.IN.ALL_PERMIT hash:net,iface hashsize 1048576 timeout 0\n$ for i in $(seq 0 100); do /sbin/ipset add ACL.IN.ALL_PERMIT 0.0.0.0/0,kaf_$i timeout 0 -exist; done\n\nThe backtrace when vmalloc fails:\n\n [Tue Oct 25 00:13:08 2022] ipset: vmalloc error: size 1073741848, exceeds total pages\n \u003c...\u003e\n [Tue Oct 25 00:13:08 2022] Call Trace:\n [Tue Oct 25 00:13:08 2022] \u003cTASK\u003e\n [Tue Oct 25 00:13:08 2022] dump_stack_lvl+0x48/0x60\n [Tue Oct 25 00:13:08 2022] warn_alloc+0x155/0x180\n [Tue Oct 25 00:13:08 2022] __vmalloc_node_range+0x72a/0x760\n [Tue Oct 25 00:13:08 2022] ? hash_netiface4_add+0x7c0/0xb20\n [Tue Oct 25 00:13:08 2022] ? __kmalloc_large_node+0x4a/0x90\n [Tue Oct 25 00:13:08 2022] kvmalloc_node+0xa6/0xd0\n [Tue Oct 25 00:13:08 2022] ? hash_netiface4_resize+0x99/0x710\n \u003c...\u003e\n\nThe fix is to enforce the limit documented in the ipset(8) manpage:\n\n\u003e The internal restriction of the hash:net,iface set type is that the same\n\u003e network prefix cannot be stored with more than 64 different interfaces\n\u003e in a single set.",
"id": "GHSA-wx74-4w24-9hwf",
"modified": "2025-05-01T15:31:52Z",
"published": "2025-05-01T15:31:52Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49911"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/42d20d5e24575c9afa2d66d9a51e7386db9514f5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/510841da1fcc16f702440ab58ef0b4d82a9056b7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a37ef32fe5956fe9248df68f6a61997845ba047e"
}
],
"schema_version": "1.4.0",
"severity": []
}
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- Confirmed: The vulnerability is confirmed from an analyst perspective.
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