Answer in brief
CVE-2026-31407 records a High severity (CVSS 7.1) vulnerability in netfilter: conntrack: add missing netlink policy validations. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=a258860e01b80e8f554a4ab1a6c95e6042eb8b73 <e7b5766693477c52424cc6c79dd30a7a9c7db52c || >=a258860e01b80e8f554a4ab1a6c95e6042eb8b73 <78bba9f73942aa7dca47d817d8cec0fb9b443b70 || >=a258860e01b80e8f554a4ab1a6c95e6042eb8b73 <be88a337bf07afb1ee173f1099294d1b7ab3fefe || >=a258860e01b80e8f554a4ab1a6c95e6042eb8b73 <c5e918390002edf0cff80a0e7ce1f86f16a9507c || >=a258860e01b80e8f554a4ab1a6c95e6042eb8b73 <9174d28f3f15d8c4962f5980c0be167633880443 || >=a258860e01b80e8f554a4ab1a6c95e6042eb8b73 <67c53c1978cef3c504237275e39c857e2f6af56e || >=a258860e01b80e8f554a4ab1a6c95e6042eb8b73 <0fbae1e74493d5a160a70c51aeba035d8266ea7d || >=a258860e01b80e8f554a4ab1a6c95e6042eb8b73 <f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05 | e7b5766693477c52424cc6c79dd30a7a9c7db52c, 78bba9f73942aa7dca47d817d8cec0fb9b443b70, be88a337bf07afb1ee173f1099294d1b7ab3fefe, c5e918390002edf0cff80a0e7ce1f86f16a9507c, 9174d28f3f15d8c4962f5980c0be167633880443, 67c53c1978cef3c504237275e39c857e2f6af56e, 0fbae1e74493d5a160a70c51aeba035d8266ea7d, f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05 |
| Linux/Linuxgeneric | 2.6.27 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Apr 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.