High 7.5Published May 27, 2026

CVE-2026-45860netfilter: nf_conncount: increase the connection clean up limit to 64

Updated under an hour ago (Oct 26, 2026, 1:00 PM ET)

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Exploited in the last 30 days

In 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

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-400
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from f106694733c66a48740c25bc4e212e9b2ea364ce before a5c9e14e0e8923218ae881d5e78c990c07694966; from be69850b461e7b491d87a22e33ab76fdd04b725e before 13eede458fdf231f1bf96a398feea4ad1553f14c; from d265929930e2ffafc744c0ae05fb70acd53be1ee before fa85432d58c8e74b39333edbf8d28df2985dfc79; from d265929930e2ffafc744c0ae05fb70acd53be1ee before 0792ad077d776c2dcf20f0484e2461ded1b77a24; from d265929930e2ffafc744c0ae05fb70acd53be1ee before 3d0994ed0aa1fc0a2c5e620b765e8defdd021bff; from d265929930e2ffafc744c0ae05fb70acd53be1ee before 6e5fa7add3e76da068a478d905be64be8fa4e80a; from d265929930e2ffafc744c0ae05fb70acd53be1ee before 0af0812baf2d363176c9b76fc07e33f13aede8db; from d265929930e2ffafc744c0ae05fb70acd53be1ee before 21d033e472735ecec677f1ae46d6740b5e47a4f3; and 2 more ranges	CNA record
linux linux_kernel linux:linux_kernel	from 5.10.248 before 5.10.252; from 5.15.198 before 5.15.202; from 5.19 before 6.1.165; from 6.2 before 6.6.128; from 6.7 before 6.12.75; from 6.13 before 6.18.14; from 6.19 before 6.19.4	NVD

References

References

https://git.kernel.org/stable/c/a5c9e14e0e8923218ae881d5e78c990c07694966	patch
https://git.kernel.org/stable/c/13eede458fdf231f1bf96a398feea4ad1553f14c	patch
https://git.kernel.org/stable/c/fa85432d58c8e74b39333edbf8d28df2985dfc79	patch
https://git.kernel.org/stable/c/0792ad077d776c2dcf20f0484e2461ded1b77a24	patch
https://git.kernel.org/stable/c/3d0994ed0aa1fc0a2c5e620b765e8defdd021bff	patch
https://git.kernel.org/stable/c/6e5fa7add3e76da068a478d905be64be8fa4e80a	patch
https://git.kernel.org/stable/c/0af0812baf2d363176c9b76fc07e33f13aede8db	patch
https://git.kernel.org/stable/c/21d033e472735ecec677f1ae46d6740b5e47a4f3	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.