# CVE-2026-64411: netfilter: ebtables: terminate table name before find_table_lock()

Status: published. Published: 2026-07-25. Updated: 2026-11-10.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 4c046ca4e35a83ea32f6e748f54139f5fe2a1d01 (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < ab63ccefb9c71627f957a0724c2b9ebc869c6f20 (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < c6f539311e58e76aa96feef0f1572b13a564f8a2 (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 2664f537ca5bcb2ef3fac2683dcca602e51fad24 (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 7436da6c1bc44654b7f11a17e746f6999fd37250 (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 6fe8d3cecd20bfaaaf440db3a06ba674d2f2e322 (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < b6183b1b88a722b6d8ea0cecc99eba168a15e0be (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < a622d2e9608c9dff47fc2e5759ac7aa3a836b45d (affected, git). Source: CNA: Linux
- Linux / Linux: 2.6.12 (affected); ≥ 0; < 2.6.12 (unaffected, semver); ≥ 5.10.261; ≤ 5.10.* (unaffected, semver); ≥ 5.15.212; ≤ 5.15.* (unaffected, semver); ≥ 6.1.178; ≤ 6.1.* (unaffected, semver); ≥ 6.6.145; ≤ 6.6.* (unaffected, semver); ≥ 6.12.96; ≤ 6.12.* (unaffected, semver); ≥ 6.18.39; ≤ 6.18.* (unaffected, semver); ≥ 7.1.4; ≤ 7.1.* (unaffected, semver); ≥ 7.2; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP

## Severity and prioritization

- CVSS 3.1: 7.1 (high); CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H; source: CNA: Linux

- CISA KEV: No listing in collected sources

- EPSS: 0.13% as of 2026-11-09; percentile 2.77%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-125

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/4c046ca4e35a83ea32f6e748f54139f5fe2a1d01 (CNA: Linux)

- https://git.kernel.org/stable/c/ab63ccefb9c71627f957a0724c2b9ebc869c6f20 (CNA: Linux)

- https://git.kernel.org/stable/c/c6f539311e58e76aa96feef0f1572b13a564f8a2 (CNA: Linux)

- https://git.kernel.org/stable/c/2664f537ca5bcb2ef3fac2683dcca602e51fad24 (CNA: Linux)

- https://git.kernel.org/stable/c/7436da6c1bc44654b7f11a17e746f6999fd37250 (CNA: Linux)

- https://git.kernel.org/stable/c/6fe8d3cecd20bfaaaf440db3a06ba674d2f2e322 (CNA: Linux)

- https://git.kernel.org/stable/c/b6183b1b88a722b6d8ea0cecc99eba168a15e0be (CNA: Linux)

- https://git.kernel.org/stable/c/a622d2e9608c9dff47fc2e5759ac7aa3a836b45d (CNA: Linux)

- https://cert-portal.siemens.com/productcert/html/ssa-019113.html (ADP: siemens-SADP)

- https://cert-portal.siemens.com/productcert/html/ssa-457936.html (ADP: siemens-SADP)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-64411; retrieved 2026-11-10; source updated 2026-11-10

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-64411; retrieved 2026-11-10; source updated Not reported

Revision: 8d8c69dd87664ade450fee871a6c2629c04f6a45de0767a5465bca1d89b9c481

Canonical: https://y2.dev/cve/CVE-2026-64411

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