netfilter: nf_conncount: increase the connection clean up limit to 64

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Summary

CVECVE-2026-45860
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:16:58 UTC
Updated2026-05-27 14:48:31 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conncount: increase the connection clean up limit to 64 After the optimization to only perform one GC per jiffy, a new problem was introduced. If more than 8 new connections are tracked per jiffy the list won't be cleaned up fast enough possibly reaching the limit wrongly. In order to prevent this issue, only skip the GC if it was already triggered during the same jiffy and the increment is lower than the clean up limit. In addition, increase the clean up limit to 64 connections to avoid triggering GC too often and do more effective GCs. This has been tested using a HTTP server and several performance tools while having nft_connlimit/xt_connlimit or OVS limit configured. Output of slowhttptest + OVS limit at 52000 connections: slow HTTP test status on 340th second: initializing: 0 pending: 432 connected: 51998 error: 0 closed: 0 service available: YES

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f106694733c66a48740c25bc4e212e9b2ea364ce a5c9e14e0e8923218ae881d5e78c990c07694966 git Not specified
CNA Linux Linux affected be69850b461e7b491d87a22e33ab76fdd04b725e 13eede458fdf231f1bf96a398feea4ad1553f14c git Not specified
CNA Linux Linux affected d265929930e2ffafc744c0ae05fb70acd53be1ee fa85432d58c8e74b39333edbf8d28df2985dfc79 git Not specified
CNA Linux Linux affected d265929930e2ffafc744c0ae05fb70acd53be1ee 0792ad077d776c2dcf20f0484e2461ded1b77a24 git Not specified
CNA Linux Linux affected d265929930e2ffafc744c0ae05fb70acd53be1ee 3d0994ed0aa1fc0a2c5e620b765e8defdd021bff git Not specified
CNA Linux Linux affected d265929930e2ffafc744c0ae05fb70acd53be1ee 6e5fa7add3e76da068a478d905be64be8fa4e80a git Not specified
CNA Linux Linux affected d265929930e2ffafc744c0ae05fb70acd53be1ee 0af0812baf2d363176c9b76fc07e33f13aede8db git Not specified
CNA Linux Linux affected d265929930e2ffafc744c0ae05fb70acd53be1ee 21d033e472735ecec677f1ae46d6740b5e47a4f3 git Not specified
CNA Linux Linux affected 5.10.248 5.10.252 semver Not specified
CNA Linux Linux affected 5.15.198 5.15.202 semver Not specified
CNA Linux Linux affected 5.19 Not specified
CNA Linux Linux unaffected 5.19 semver Not specified
CNA Linux Linux unaffected 5.10.252 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.202 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.165 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.128 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.75 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.14 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.4 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a5c9e14e0e8923218ae881d5e78c990c07694966 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6e5fa7add3e76da068a478d905be64be8fa4e80a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/21d033e472735ecec677f1ae46d6740b5e47a4f3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/13eede458fdf231f1bf96a398feea4ad1553f14c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3d0994ed0aa1fc0a2c5e620b765e8defdd021bff 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fa85432d58c8e74b39333edbf8d28df2985dfc79 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0792ad077d776c2dcf20f0484e2461ded1b77a24 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0af0812baf2d363176c9b76fc07e33f13aede8db 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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