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CVE-2025-38639

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_nfacct: don't assume acct name is null-terminated BUG: KASAN: slab-out-of-bounds in ..

Published Aug 22, 2025EPSS 0.18%

Overview

CVE-2025-38639 is a high-severity vulnerability. It was published on August 22, 2025 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

netfilter: xt_nfacct: don't assume acct name is null-terminated

BUG: KASAN: slab-out-of-bounds in .. lib/vsprintf.c:721

Read of size 1 at addr ffff88801eac95c8 by task syz-executor183/5851

[..]

string+0x231/0x2b0 lib/vsprintf.c:721

vsnprintf+0x739/0xf00 lib/vsprintf.c:2874

[..]

nfacct_mt_checkentry+0xd2/0xe0 net/netfilter/xt_nfacct.c:41

xt_check_match+0x3d1/0xab0 net/netfilter/x_tables.c:523

nfnl_acct_find_get() handles non-null input, but the error

printk relied on its presence.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/58004aa21e79addaf41667bfe65e93ec51653f18Refgit.kernel.org/stable/c/58007fc7b94fb2702000045ff401eb7f5bde7828Refgit.kernel.org/stable/c/66d41268ede1e1b6e71ba28be923397ff0b2b9c3Refgit.kernel.org/stable/c/7c1ae471da69c09242834e956218ea6a42dd405aRefgit.kernel.org/stable/c/b10cfa2de13d28ddd03210eb234422b7ec92725aRefgit.kernel.org/stable/c/bf58e667af7d96c8eb9411f926a0a0955f41ce21Refgit.kernel.org/stable/c/df13c9c6ce1d55c31d1bd49db65a7fbbd86aab13Refgit.kernel.org/stable/c/e021a1eee196887536a6630c5492c23a4c78d452Refgit.kernel.org/stable/c/e18939176e657a3a20bfbed357b8c55a9f82aba3Reflists.debian.org/debian-lts-announce/2025/10/msg00007.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38639?

CVE-2025-38639 is a high-severity vulnerability. It was published on August 22, 2025 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2025-38639?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-38639?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-38639?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38639 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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