net: openvswitch: conntrack: fix helper UAF due to extensions realloc

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98490
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:16:59 UTC
Updated2026-10-30 13:21:14 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: openvswitch: conntrack: 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.006950000 probability, percentile 0.529890000 (date 2026-11-01)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected cae3a2627520c3795b54533c5328b77af3405dbe f53d13a286fb275bda0efdf445b8a1e4dfcb717b git Not specified
CNA Linux Linux affected cae3a2627520c3795b54533c5328b77af3405dbe 84d47a83b7b717576de0defab46b8823a22853b0 git Not specified
CNA Linux Linux affected cae3a2627520c3795b54533c5328b77af3405dbe 9f308197395c1a524b736e401cbc8a2ed7d246c9 git Not specified
CNA Linux Linux affected cae3a2627520c3795b54533c5328b77af3405dbe 18866dc1f525f9ee4de7709529d1ae1af8d8e8be git Not specified
CNA Linux Linux affected cae3a2627520c3795b54533c5328b77af3405dbe afcf362625190c5260530b1d6c7daa98831f6b83 git Not specified
CNA Linux Linux affected cae3a2627520c3795b54533c5328b77af3405dbe 5f23080a625dd7855ab91485c8d691a54a1979f0 git Not specified
CNA Linux Linux affected cae3a2627520c3795b54533c5328b77af3405dbe e02a83bb0b7a203f6a22f55ad5f426765560f811 git Not specified
CNA Linux Linux affected cae3a2627520c3795b54533c5328b77af3405dbe 1a4151e6be57b098b7a5ebfbde58585e83200cdc git Not specified
CNA Linux Linux affected 4.3 Not specified
CNA Linux Linux unaffected 4.3 semver Not specified
CNA Linux Linux unaffected 5.10.273 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.224 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.191 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.160 6.6.* 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/18866dc1f525f9ee4de7709529d1ae1af8d8e8be 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5f23080a625dd7855ab91485c8d691a54a1979f0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9f308197395c1a524b736e401cbc8a2ed7d246c9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f53d13a286fb275bda0efdf445b8a1e4dfcb717b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/afcf362625190c5260530b1d6c7daa98831f6b83 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/84d47a83b7b717576de0defab46b8823a22853b0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1a4151e6be57b098b7a5ebfbde58585e83200cdc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e02a83bb0b7a203f6a22f55ad5f426765560f811 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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