net/sched: act_ct: fix helper UAF due to extensions realloc

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98442
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:16:54 UTC
Updated2026-10-19 10:18:52 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net/sched: act_ct: fix helper UAF due to extensions realloc While calling the helpers, a raw pointer to the extensions area is wired into expectations list: -> nf_ct_helper() -> helper->help() -> nf_ct_expect_related_report() -> nf_ct_expect_insert() -> hlist_add_head_rcu(&exp->lnode, &master_help->expectations) In case the connection is not confirmed yet, more extensions can be added afterwards with *_ext_add() calls reallocating the extension space and leaving the now invalid pointer in the expectations list that is later accessed while removing the expectation. Make sure that helpers are called at the end after all the other extensions are already added. Note that the helper rejection now leaves the mark and labels set, but that's not different from how the NAT was handled before or how the mark and the labels were handled on confirmation failure. And there are no atomicity guarantees provided by the API anyway.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a21b06e7319129994f339ed47f512bbe57b77f5b 1679bbf5fbeac52a310b1a58b2b301bbf388bdbf git Not specified
CNA Linux Linux affected a21b06e7319129994f339ed47f512bbe57b77f5b 812c16a255e7773a544e88b39ae6daed25544d30 git Not specified
CNA Linux Linux affected a21b06e7319129994f339ed47f512bbe57b77f5b 8988f4d11f3fba0ab38122178836c683ad516a05 git Not specified
CNA Linux Linux affected a21b06e7319129994f339ed47f512bbe57b77f5b dad19b59da050cb60d3f7023dac2a042a84bf0bd git Not specified
CNA Linux Linux affected 6.2 Not specified
CNA Linux Linux unaffected 6.2 semver Not specified
CNA Linux Linux unaffected 6.12.112 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.55 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.9 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1679bbf5fbeac52a310b1a58b2b301bbf388bdbf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dad19b59da050cb60d3f7023dac2a042a84bf0bd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/812c16a255e7773a544e88b39ae6daed25544d30 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8988f4d11f3fba0ab38122178836c683ad516a05 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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