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Vulnerability record · CVE-2026-31407 · published 6 April 2026

CVE-2026-31407: Linux kernel out-of-bounds write vulnerability

Linux · Linux Kernel

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.

7.1 CVSS 3.1 High EPSS 0.17% · top 94.7% CWE-787 · Out-of-bounds write
7.1CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
24 Jul 2026Last modified by NVD

Description

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:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0fbae1e74493d5a160a70c51aeba035d8266ea7d Patch
https://git.kernel.org/stable/c/67c53c1978cef3c504237275e39c857e2f6af56e Patch
https://git.kernel.org/stable/c/78bba9f73942aa7dca47d817d8cec0fb9b443b70
https://git.kernel.org/stable/c/9174d28f3f15d8c4962f5980c0be167633880443 Patch
https://git.kernel.org/stable/c/be88a337bf07afb1ee173f1099294d1b7ab3fefe
https://git.kernel.org/stable/c/c5e918390002edf0cff80a0e7ce1f86f16a9507c Patch
https://git.kernel.org/stable/c/e7b5766693477c52424cc6c79dd30a7a9c7db52c
https://git.kernel.org/stable/c/f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-31407), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.