CVE-2025-71120 SUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in gss_read_proxy_verf
A NULL pointer dereference in the Linux kernel SUNRPC module allows attackers to cause a denial of service via zero-length GSS tokens.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-71120?
CVE-2025-71120 is a high-severity vulnerability in Linux kernel, published on 14 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
SUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in gss_read_proxy_verf
A zero length gss_token results in pages == 0 and in_token->pages[0] is NULL. The code unconditionally evaluates page_address(in_token->pages[0]) for the initial memcpy, which can dereference NULL even when the copy length is 0. Guard the first memcpy so it only runs when length > 0.
Weakness: CWE-476
Which versions are affected by CVE-2025-71120?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-71120?
Apply the vendor's patch.
Is CVE-2025-71120 being exploited?
There is no known exploitation of CVE-2025-71120 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-74628, BELL-CVE-2025-71120, DEBIAN-CVE-2025-71120, GHSA-f8g6-pm49-2rcv, ROOT-OS-DEBIAN-11-CVE-2025-71120, ROOT-OS-DEBIAN-12-CVE-2025-71120 and 4 more.