CVE-2026-31414netfilter: nf_conntrack_expect: use expect->helper
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_expect: use expect->helper Use expect->helper in ctnetlink and /proc to dump the helper name. Using nfct_help() without holding a reference to the master conntrack is unsafe. Use exp->master->helper in ctnetlink path if userspace does not provide an explicit helper when creating an expectation to retain the existing behaviour. The ctnetlink expectation path holds the reference on the master conntrack and nf_conntrack_expect lock and the nfnetlink glue path refers to the master ct that is attached to the skb.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from ea781f197d6a835cbb93a0bf88ee1696296ed8aa before 847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781; from ea781f197d6a835cbb93a0bf88ee1696296ed8aa before e7ccaa0a62a8ff2be5d521299ce79390c318d306; from ea781f197d6a835cbb93a0bf88ee1696296ed8aa before 4bd1b3d839172724b33d8d02c5a4ff6a1c775417; from ea781f197d6a835cbb93a0bf88ee1696296ed8aa before b53294bff19e56ada2f230ceb8b1ffde61cc3817; from ea781f197d6a835cbb93a0bf88ee1696296ed8aa before 3dfd3f7712b5a800f2ba632179e9b738076a51f0; from ea781f197d6a835cbb93a0bf88ee1696296ed8aa before f01794106042ee27e54af6fdf5b319a2fe3df94d | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 2.6.30 before 6.1.168; from 6.2 before 6.6.134; from 6.7 before 6.12.81; from 6.13 before 6.18.22; from 6.19 before 6.19.12; 7.0; 7.0; 7.0; and 3 more ranges | NVD |
References
- https://git.kernel.org/stable/c/847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781patch
- https://git.kernel.org/stable/c/e7ccaa0a62a8ff2be5d521299ce79390c318d306patch
- https://git.kernel.org/stable/c/4bd1b3d839172724b33d8d02c5a4ff6a1c775417patch
- https://git.kernel.org/stable/c/b53294bff19e56ada2f230ceb8b1ffde61cc3817patch
- https://git.kernel.org/stable/c/3dfd3f7712b5a800f2ba632179e9b738076a51f0patch
- https://git.kernel.org/stable/c/f01794106042ee27e54af6fdf5b319a2fe3df94dpatch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.