CVE-2026-31407netfilter: conntrack: add missing netlink policy validations
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: conntrack: add missing netlink policy validations Hyunwoo Kim reports out-of-bounds access in sctp and ctnetlink. These attributes are used by the kernel without any validation. Extend the netlink policies accordingly. Quoting the reporter: nlattr_to_sctp() assigns the user-supplied CTA_PROTOINFO_SCTP_STATE value directly to ct->proto.sctp.state without checking that it is within the valid range. [..] and: ... with exp->dir = 100, the access at ct->master->tuplehash[100] reads 5600 bytes past the start of a 320-byte nf_conn object, causing a slab-out-of-bounds read confirmed by UBSAN.
- CVSS
- 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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 a258860e01b80e8f554a4ab1a6c95e6042eb8b73 before e7b5766693477c52424cc6c79dd30a7a9c7db52c; from a258860e01b80e8f554a4ab1a6c95e6042eb8b73 before 78bba9f73942aa7dca47d817d8cec0fb9b443b70; from a258860e01b80e8f554a4ab1a6c95e6042eb8b73 before be88a337bf07afb1ee173f1099294d1b7ab3fefe; from a258860e01b80e8f554a4ab1a6c95e6042eb8b73 before c5e918390002edf0cff80a0e7ce1f86f16a9507c; from a258860e01b80e8f554a4ab1a6c95e6042eb8b73 before 9174d28f3f15d8c4962f5980c0be167633880443; from a258860e01b80e8f554a4ab1a6c95e6042eb8b73 before 67c53c1978cef3c504237275e39c857e2f6af56e; from a258860e01b80e8f554a4ab1a6c95e6042eb8b73 before 0fbae1e74493d5a160a70c51aeba035d8266ea7d; from a258860e01b80e8f554a4ab1a6c95e6042eb8b73 before f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05 | CNA record |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
linux linux_kernel linux:linux_kernel | from 2.6.27 before 6.6.136; from 6.7 before 6.12.83; from 6.13 before 6.18.24; from 6.19 before 6.19.10; 7.0; 7.0; 7.0; 7.0 | NVD |
References
- https://git.kernel.org/stable/c/e7b5766693477c52424cc6c79dd30a7a9c7db52c
- https://git.kernel.org/stable/c/78bba9f73942aa7dca47d817d8cec0fb9b443b70
- https://git.kernel.org/stable/c/be88a337bf07afb1ee173f1099294d1b7ab3fefe
- https://git.kernel.org/stable/c/c5e918390002edf0cff80a0e7ce1f86f16a9507cpatch
- https://git.kernel.org/stable/c/9174d28f3f15d8c4962f5980c0be167633880443patch
- https://git.kernel.org/stable/c/67c53c1978cef3c504237275e39c857e2f6af56epatch
- https://git.kernel.org/stable/c/0fbae1e74493d5a160a70c51aeba035d8266ea7dpatch
- https://git.kernel.org/stable/c/f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05patch
- https://cert-portal.siemens.com/productcert/html/ssa-784472.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.