CVE-2026-31407

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

7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 7% of CVEs (scores of 2026-10-25)

CWEs

CWE-787, CWE-125

Published

2026-04-06

Modified

2026-10-19

Record from

the NVD, synced 2026-10-21

Affected

• linux:linux_kernel

References

• https://git.kernel.org/stable/c/0fbae1e74493d5a160a70c51aeba035d8266ea7d
• https://git.kernel.org/stable/c/67c53c1978cef3c504237275e39c857e2f6af56e
• https://git.kernel.org/stable/c/78bba9f73942aa7dca47d817d8cec0fb9b443b70
• https://git.kernel.org/stable/c/9174d28f3f15d8c4962f5980c0be167633880443
• https://git.kernel.org/stable/c/be88a337bf07afb1ee173f1099294d1b7ab3fefe

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