ghsa-q8rf-2mp5-5994
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
netlink: Fix wraparounds of sk->sk_rmem_alloc.
Netlink has this pattern in some places
if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf) atomic_add(skb->truesize, &sk->sk_rmem_alloc);
, which has the same problem fixed by commit 5a465a0da13e ("udp: Fix multiple wraparounds of sk->sk_rmem_alloc.").
For example, if we set INT_MAX to SO_RCVBUFFORCE, the condition is always false as the two operands are of int.
Then, a single socket can eat as many skb as possible until OOM happens, and we can see multiple wraparounds of sk->sk_rmem_alloc.
Let's fix it by using atomic_add_return() and comparing the two variables as unsigned int.
Before: [root@fedora ~]# ss -f netlink Recv-Q Send-Q Local Address:Port Peer Address:Port -1668710080 0 rtnl:nl_wraparound/293 *
After: [root@fedora ~]# ss -f netlink Recv-Q Send-Q Local Address:Port Peer Address:Port 2147483072 0 rtnl:nl_wraparound/290 * ^ `--- INT_MAX - 576
{
"affected": [],
"aliases": [
"CVE-2025-38465"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-07-25T16:15:32Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetlink: Fix wraparounds of sk-\u003esk_rmem_alloc.\n\nNetlink has this pattern in some places\n\n if (atomic_read(\u0026sk-\u003esk_rmem_alloc) \u003e sk-\u003esk_rcvbuf)\n \tatomic_add(skb-\u003etruesize, \u0026sk-\u003esk_rmem_alloc);\n\n, which has the same problem fixed by commit 5a465a0da13e (\"udp:\nFix multiple wraparounds of sk-\u003esk_rmem_alloc.\").\n\nFor example, if we set INT_MAX to SO_RCVBUFFORCE, the condition\nis always false as the two operands are of int.\n\nThen, a single socket can eat as many skb as possible until OOM\nhappens, and we can see multiple wraparounds of sk-\u003esk_rmem_alloc.\n\nLet\u0027s fix it by using atomic_add_return() and comparing the two\nvariables as unsigned int.\n\nBefore:\n [root@fedora ~]# ss -f netlink\n Recv-Q Send-Q Local Address:Port Peer Address:Port\n -1668710080 0 rtnl:nl_wraparound/293 *\n\nAfter:\n [root@fedora ~]# ss -f netlink\n Recv-Q Send-Q Local Address:Port Peer Address:Port\n 2147483072 0 rtnl:nl_wraparound/290 *\n ^\n `--- INT_MAX - 576",
"id": "GHSA-q8rf-2mp5-5994",
"modified": "2025-07-25T18:30:40Z",
"published": "2025-07-25T18:30:40Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38465"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4b8e18af7bea92f8b7fb92d40aeae729209db250"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/55baecb9eb90238f60a8350660d6762046ebd3bd"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/76602d8e13864524382b0687dc32cd8f19164d5a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9da025150b7c14a8390fc06aea314c0a4011e82c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ae8f160e7eb24240a2a79fc4c815c6a0d4ee16cc"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c4ceaac5c5ba0b992ee1dc88e2a02421549e5c98"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/cd7ff61bfffd7000143c42bbffb85eeb792466d6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fd69af06101090eaa60b3d216ae715f9c0a58e5b"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
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