ipvs: filter some flags received in the backup server

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98794
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:33 UTC
Updated2026-10-21 13:21:47 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ipvs: filter some flags received in the backup server While the IPVS SYNC protocol is not secure by design we can still protect the backup server from messages that can wreak havoc. This commit addresses problems from received connection flags or their combinations. We now drop messages as follows: 1. the NO_CPORT+TEMPLATE combination allows lookups for normal connections to hit template which can break in many ways. While the master does not sync connections with NO_CPORT flag, i.e. before they are established, we still accept NO_CPORT without TEMPLATE. 2. ONE_PACKET: it is not sent by master, so we do not expect it in backup. Before now it was ignored by IP_VS_CONN_F_BACKUP_MASK for protocol v1 while protocol v0 created connections that are not hashed and dropped immediately. Better to apply the IP_VS_CONN_F_BACKUP_MASK also to the flags from v0 messages for consistency with v1.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6 d7d33c9efa9d1a2f244a1a64ec9b540b0f8975a0 git Not specified
CNA Linux Linux affected 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6 f4cd1db7d421e82945713a36084bb0c35b75b27e git Not specified
CNA Linux Linux affected 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6 55d033324f67a15ff56be6d38d6e87f644e0ed62 git Not specified
CNA Linux Linux affected 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6 45a93111835ccfea7d969ec73588e33745fd9834 git Not specified
CNA Linux Linux affected 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6 f96e91748f6304668fe647e686d199d7207d36f1 git Not specified
CNA Linux Linux affected 2.6.14 Not specified
CNA Linux Linux unaffected 2.6.14 semver Not specified
CNA Linux Linux unaffected 6.6.160 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.56 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/55d033324f67a15ff56be6d38d6e87f644e0ed62 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/45a93111835ccfea7d969ec73588e33745fd9834 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f4cd1db7d421e82945713a36084bb0c35b75b27e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f96e91748f6304668fe647e686d199d7207d36f1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d7d33c9efa9d1a2f244a1a64ec9b540b0f8975a0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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