netfilter: conntrack: add missing netlink policy validations

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Summary

CVECVE-2026-31407
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-06 08:16:38 UTC
Updated2026-04-07 13:20:35 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.000080000 probability, percentile 0.007100000 (date 2026-04-07)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a258860e01b80e8f554a4ab1a6c95e6042eb8b73 0fbae1e74493d5a160a70c51aeba035d8266ea7d git Not specified
CNA Linux Linux affected a258860e01b80e8f554a4ab1a6c95e6042eb8b73 f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05 git Not specified
CNA Linux Linux affected 2.6.27 Not specified
CNA Linux Linux unaffected 2.6.27 semver Not specified
CNA Linux Linux unaffected 6.19.10 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0-rc5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0fbae1e74493d5a160a70c51aeba035d8266ea7d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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