CVE-2025-38465: Linux kernel · netlink: Fix wraparounds of sk->sk_rmem_alloc.
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in fd69af06101090eaa60b3d216ae715f9c0a58e5b : update Linux kernel when convenient.
Data as of 5 Nov 2026, 21:19 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-05.
- Patch
- Available – fixed in fd69af06101090eaa60b3d216ae715f9c0a58e5b, cd7ff61bfffd7000143c42bbffb85eeb792466d6, c4ceaac5c5ba0b992ee1dc88e2a02421549e5c98 +5
Exploitation evidence
Disclosed: evidence found.
CVE published 25 Jul 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
Description
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
References
- git.kernel.org/stable/c/9da025150b7c14a8390fc06aea314c0a4011e82c (opens in a new tab)
- git.kernel.org/stable/c/c4ceaac5c5ba0b992ee1dc88e2a02421549e5c98 (opens in a new tab)
- git.kernel.org/stable/c/fd69af06101090eaa60b3d216ae715f9c0a58e5b (opens in a new tab)
- git.kernel.org/stable/c/76602d8e13864524382b0687dc32cd8f19164d5a (opens in a new tab)
- git.kernel.org/stable/c/55baecb9eb90238f60a8350660d6762046ebd3bd (opens in a new tab)
- git.kernel.org/stable/c/4b8e18af7bea92f8b7fb92d40aeae729209db250 (opens in a new tab)
- git.kernel.org/stable/c/cd7ff61bfffd7000143c42bbffb85eeb792466d6 (opens in a new tab)
- git.kernel.org/stable/c/ae8f160e7eb24240a2a79fc4c815c6a0d4ee16cc (opens in a new tab)
- lists.debian.org/debian-lts-announce/2025/10/msg00008.html (opens in a new tab)
- lists.debian.org/debian-lts-announce/2025/10/msg00007.html (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-082556.html (opens in a new tab)