CVE-2026-31407

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxa258860e01b80e8f554a4ab1a6c95e6042eb8b73 < e7b5766693477c52424cc6c79dd30a7a9c7db52caffected
LinuxLinuxa258860e01b80e8f554a4ab1a6c95e6042eb8b73 < 78bba9f73942aa7dca47d817d8cec0fb9b443b70affected
LinuxLinuxa258860e01b80e8f554a4ab1a6c95e6042eb8b73 < be88a337bf07afb1ee173f1099294d1b7ab3fefeaffected
LinuxLinuxa258860e01b80e8f554a4ab1a6c95e6042eb8b73 < c5e918390002edf0cff80a0e7ce1f86f16a9507caffected
LinuxLinuxa258860e01b80e8f554a4ab1a6c95e6042eb8b73 < 9174d28f3f15d8c4962f5980c0be167633880443affected
LinuxLinuxa258860e01b80e8f554a4ab1a6c95e6042eb8b73 < 67c53c1978cef3c504237275e39c857e2f6af56eaffected
LinuxLinuxa258860e01b80e8f554a4ab1a6c95e6042eb8b73 < 0fbae1e74493d5a160a70c51aeba035d8266ea7daffected
LinuxLinuxa258860e01b80e8f554a4ab1a6c95e6042eb8b73 < f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05affected
LinuxLinux2.6.27affected
LinuxLinux0 < 2.6.27unaffected
LinuxLinux5.10.258 <= 5.10.*unaffected
LinuxLinux5.15.209 <= 5.15.*unaffected
LinuxLinux6.1.175 <= 6.1.*unaffected
LinuxLinux6.6.136 <= 6.6.*unaffected
LinuxLinux6.12.83 <= 6.12.*unaffected
LinuxLinux6.18.24 <= 6.18.*unaffected
LinuxLinux6.19.10 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References