CVE-2025-38465

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Source
https://cve.org/CVERecord?id=CVE-2025-38465
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-38465.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-38465
Downstream
Related
Published
2025-07-25T15:27:47.510Z
Modified
2026-03-20T12:42:52.693345Z
Summary
netlink: Fix wraparounds of sk->sk_rmem_alloc.
Details

In the Linux kernel, the following vulnerability has been resolved:

netlink: Fix wraparounds of sk->skrmemalloc.

Netlink has this pattern in some places

if (atomicread(&sk->skrmemalloc) > sk->skrcvbuf) atomicadd(skb->truesize, &sk->skrmem_alloc);

, which has the same problem fixed by commit 5a465a0da13e ("udp: Fix multiple wraparounds of sk->skrmemalloc.").

For example, if we set INTMAX to SORCVBUFFORCE, 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->skrmemalloc.

Let's fix it by using atomicaddreturn() 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:nlwraparound/290 * ^ `--- INTMAX - 576

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38465.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Fixed
9da025150b7c14a8390fc06aea314c0a4011e82c
Fixed
c4ceaac5c5ba0b992ee1dc88e2a02421549e5c98
Fixed
fd69af06101090eaa60b3d216ae715f9c0a58e5b
Fixed
76602d8e13864524382b0687dc32cd8f19164d5a
Fixed
55baecb9eb90238f60a8350660d6762046ebd3bd
Fixed
4b8e18af7bea92f8b7fb92d40aeae729209db250
Fixed
cd7ff61bfffd7000143c42bbffb85eeb792466d6
Fixed
ae8f160e7eb24240a2a79fc4c815c6a0d4ee16cc

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-38465.json"