---
id: CVE-2025-38465
title: 'netlink: Fix wraparounds of sk->sk_rmem_alloc.'
summary: "In the Linux kernel, the following vulnerability has been resolved:\n\nnetlink: Fix wraparounds of sk->sk_rmem_alloc.\n\nNetlink has this pattern in some places\n\n  if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf)\n  \tatomic_add(skb->trues…"
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    9da025150b7c14a8390fc06aea314c0a4011e82c
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    c4ceaac5c5ba0b992ee1dc88e2a02421549e5c98
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    fd69af06101090eaa60b3d216ae715f9c0a58e5b
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    76602d8e13864524382b0687dc32cd8f19164d5a
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    55baecb9eb90238f60a8350660d6762046ebd3bd
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    4b8e18af7bea92f8b7fb92d40aeae729209db250
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    cd7ff61bfffd7000143c42bbffb85eeb792466d6
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    ae8f160e7eb24240a2a79fc4c815c6a0d4ee16cc
  - Linux 2.6.12
published: '2025-07-25'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T01:07:19.018Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-38465'
references:
  - url: 'https://git.kernel.org/stable/c/9da025150b7c14a8390fc06aea314c0a4011e82c'
  - url: 'https://git.kernel.org/stable/c/c4ceaac5c5ba0b992ee1dc88e2a02421549e5c98'
  - url: 'https://git.kernel.org/stable/c/fd69af06101090eaa60b3d216ae715f9c0a58e5b'
  - url: 'https://git.kernel.org/stable/c/76602d8e13864524382b0687dc32cd8f19164d5a'
  - url: 'https://git.kernel.org/stable/c/55baecb9eb90238f60a8350660d6762046ebd3bd'
  - url: 'https://git.kernel.org/stable/c/4b8e18af7bea92f8b7fb92d40aeae729209db250'
  - url: 'https://git.kernel.org/stable/c/cd7ff61bfffd7000143c42bbffb85eeb792466d6'
  - url: 'https://git.kernel.org/stable/c/ae8f160e7eb24240a2a79fc4c815c6a0d4ee16cc'
tags:
  - cve.org
epss: 0.002
epssPercentile: 0.09819
ingestedAt: '2026-10-15T05:52:46.087Z'
---

## Overview

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

- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9da025150b7c14a8390fc06aea314c0a4011e82c`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c4ceaac5c5ba0b992ee1dc88e2a02421549e5c98`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < fd69af06101090eaa60b3d216ae715f9c0a58e5b`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 76602d8e13864524382b0687dc32cd8f19164d5a`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 55baecb9eb90238f60a8350660d6762046ebd3bd`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 4b8e18af7bea92f8b7fb92d40aeae729209db250`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < cd7ff61bfffd7000143c42bbffb85eeb792466d6`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < ae8f160e7eb24240a2a79fc4c815c6a0d4ee16cc`
- `Linux 2.6.12`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.