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CVE-2026-72020

Updated on 15 Aug 2026

Severity

9.8 Critical severity

Details

CVSS score: 9.8
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected product
Affected component
Links: NIST CIRCL RHEL Ubuntu

Overview

About vulnerability

In the Linux kernel, the following vulnerability has been resolved:

ipvs: reset full ip_vs_seq structs in ip_vs_conn_new

Commit 9a05475cebdd (“ipvs: avoid kmem_cache_zalloc in ip_vs_conn_new”) changed ip_vs_conn_new() to allocate an ip_vs_conn object with kmem_cache_alloc(). The function then initializes many fields explicitly, but only resets in_seq.delta and out_seq.delta in the two struct ip_vs_seq members.

That leaves init_seq and previous_delta uninitialized. This is normally harmless while the corresponding IP_VS_CONN_F_IN_SEQ or IP_VS_CONN_F_OUT_SEQ flag is clear. For connections learned from a sync message, however, ip_vs_proc_conn() preserves those flags from IP_VS_CONN_F_BACKUP_MASK and passes opt=NULL when the message omits IPVS_OPT_SEQ_DATA. In that case the new connection can be hashed with SEQ flags set but with the rest of in_seq/out_seq still containing stale slab data.

When a packet for such a connection is later handled by an IPVS application helper, vs_fix_seq() and vs_fix_ack_seq() use previous_delta and init_seq to rewrite TCP sequence numbers. A malformed sync message can therefore make forwarded packets carry stale slab bytes in their TCP seq/ack numbers, and can also corrupt the forwarded TCP flow.

Reset both struct ip_vs_seq members completely before publishing the connection. This matches the existing “reset struct ip_vs_seq” comment and keeps the sequence-adjustment gates inactive unless valid sequence data is installed later.

Details

Affected product:: AlmaLinux 9.2 ESU , Amazon Linux 2 ELS , CentOS 7 ELS , CentOS 8.4 ELS , CentOS 8.5 ELS , CentOS Stream 8 ELS , CloudLinux 7 ELS , Debian 10 ELS , Debian 11 ELS , Oracle Linux 7 ELS , RHEL 7 ELS , TuxCare 9.6 ESU , TuxCare 9.8 ESU , Ubuntu 16.04 ELS , Ubuntu 18.04 ELS , Ubuntu 20.04 ELS
Affected packages:: linux @ 4.19.0 (+17 more)

Fixes

Operating system / Project

KernelCare state

Live-patch status from KernelCare for each operating system.

Operating system	Status	Covered kernels
Amazon Linux 2023	Planned	—
CentOS 7 ELS	Planned	—
Debian 12	Released	42 kernels 6.1.177-1 6.1.38-1 6.1.38-2 6.1.38-4 6.1.52-1 6.1.55-1 6.1.64-1 6.1.66-1 6.1.69-1 6.1.76-1 6.1.27-1 6.1.67-1 6.1.85-1 6.1.90-1 6.1.94-1 6.1.99-1 6.1.106-3 6.1.112-1 6.1.115-1 6.1.119-1 6.1.123-1 6.1.128-1 6.1.124-1 6.1.129-1 6.1.133-1 6.1.135-1 6.1.137-1 6.1.140-1 6.1.139-1 6.1.147-1 6.1.148-1 6.1.153-1 6.1.158-1 6.1.159-1 6.1.162-1 6.1.164-1 6.1.170-1 6.1.170-3 6.1.172-1 6.1.174-1 6.1.170-2 6.1.176-1
Debian 13	Released	13 kernels 6.12.85-1 6.12.86-1 6.12.88-1 6.12.74-2 6.12.73-1 6.12.63-1 6.12.69-1 6.12.74-1 6.12.90-1 6.12.90-2 6.12.94-1 6.12.95-1 6.12.96-1
Oracle Linux 8 UEK 7	Released	112 kernels 5.15.0-102.110.5.el8uek 5.15.0-101.103.2.1.el8uek 5.15.0-8.91.4.1.el8uek 5.15.0-7.86.6.1.el8uek 5.15.0-2.52.3.el8uek 5.15.0-100.96.32.el8uek 5.15.0-5.76.5.1.el8uek 5.15.0-6.80.3.1.el8uek 5.15.0-3.60.5.1.el8uek 5.15.0-0.30.20.el8uek 5.15.0-1.43.4.1.el8uek 5.15.0-0.30.20.1.el8uek 5.15.0-1.43.4.2.el8uek 5.15.0-4.70.5.2.el8uek 5.15.0-104.119.4.2.el8uek 5.15.0-0.30.19.el8uek 5.15.0-105.125.6.2.el8uek 5.15.0-105.125.6.2.1.el8uek 5.15.0-105.125.6.2.2.el8uek 5.15.0-106.131.4.el8uek 5.15.0-200.131.27.el8uek 5.15.0-200.131.27.1.el8uek 5.15.0-201.135.6.el8uek 5.15.0-202.135.2.el8uek 5.15.0-102.110.5.1.el8uek 5.15.0-103.114.4.el8uek 5.15.0-203.146.5.1.el8uek 5.15.0-204.147.6.2.el8uek 5.15.0-204.147.6.3.el8uek 5.15.0-205.149.5.1.el8uek 5.15.0-205.149.5.4.el8uek 5.15.0-206.153.7.el8uek 5.15.0-206.153.7.1.el8uek 5.15.0-207.156.6.el8uek 5.15.0-208.159.3.el8uek 5.15.0-208.159.3.2.el8uek 5.15.0-209.161.7.el8uek 5.15.0-209.161.7.1.el8uek 5.15.0-209.161.7.2.el8uek 5.15.0-210.163.7.el8uek 5.15.0-300.163.18.el8uek 5.15.0-300.163.18.1.el8uek 5.15.0-300.163.18.1.1.el8uek 5.15.0-301.163.5.2.el8uek 5.15.0-302.167.6.el8uek 5.15.0-300.163.18.7.el8uek 5.15.0-302.167.6.1.el8uek 5.15.0-303.171.5.2.el8uek 5.15.0-303.171.5.2.1.el8uek 5.15.0-304.171.4.el8uek 5.15.0-304.171.4.1.el8uek 5.15.0-304.171.4.3.el8uek 5.15.0-303.171.5.2.2.el8uek 5.15.0-305.176.4.el8uek 5.15.0-306.177.4.el8uek 5.15.0-306.177.4.1.el8uek 5.15.0-307.178.5.el8uek 5.15.0-308.179.6.el8uek 5.15.0-308.179.6.2.el8uek 5.15.0-308.179.6.3.el8uek 5.15.0-309.180.4.el8uek 5.15.0-308.179.6.7.el8uek 5.15.0-309.180.4.2.el8uek 5.15.0-308.179.6.11.el8uek 5.15.0-310.184.5.2.el8uek 5.15.0-310.184.5.3.el8uek 5.15.0-311.185.9.el8uek 5.15.0-308.179.6.14.el8uek 5.15.0-312.187.5.el8uek 5.15.0-312.187.5.1.el8uek 5.15.0-312.187.5.2.el8uek 5.15.0-312.187.5.3.el8uek 5.15.0-308.179.6.16.el8uek 5.15.0-313.189.5.1.el8uek 5.15.0-313.189.5.2.el8uek 5.15.0-313.189.5.3.el8uek 5.15.0-314.193.5.3.el8uek 5.15.0-314.193.5.4.el8uek 5.15.0-314.193.5.5.el8uek 5.15.0-315.196.5.1.el8uek 5.15.0-315.196.5.2.el8uek 5.15.0-316.196.4.1.el8uek 5.15.0-316.196.4.2.el8uek 5.15.0-317.197.5.1.el8uek 5.15.0-317.197.5.2.el8uek 5.15.0-318.199.3.2.el8uek 5.15.0-318.199.3.2.1.el8uek 5.15.0-319.201.4.2.el8uek 5.15.0-319.201.4.3.el8uek 5.15.0-319.201.4.4.el8uek 5.15.0-319.201.4.6.el8uek 5.15.0-320.202.8.2.el8uek 5.15.0-320.202.8.3.el8uek 5.15.0-320.202.8.4.el8uek 5.15.0-320.202.8.5.el8uek 5.15.0-318.199.3.6.el8uek 5.15.0-321.202.5.el8uek 5.15.0-321.202.5.1.el8uek 5.15.0-321.202.5.2.el8uek 5.15.0-321.202.5.3.el8uek 5.15.0-322.203.3.2.el8uek 5.15.0-322.203.3.3.el8uek 5.15.0-322.203.3.4.el8uek 5.15.0-322.203.3.4.5.el8uek 5.15.0-308.179.6.18.el8uek 5.15.0-318.199.3.7.el8uek 5.15.0-322.203.3.5.el8uek 5.15.0-322.203.3.4.1.el8uek 5.15.0-323.211.3.3.el8uek 5.15.0-323.211.3.4.el8uek 5.15.0-323.211.3.5.el8uek 5.15.0-308.179.6.19.el8uek
Oracle Linux 9 UEK 7	Released	112 kernels 5.15.0-101.103.2.1.el9uek 5.15.0-8.91.4.1.el9uek 5.15.0-7.86.6.1.el9uek 5.15.0-5.76.5.1.el9uek 5.15.0-6.80.3.1.el9uek 5.15.0-3.60.5.1.el9uek 5.15.0-0.30.20.el9uek 5.15.0-100.96.32.el9uek 5.15.0-1.43.4.2.el9uek 5.15.0-2.52.3.el9uek 5.15.0-4.70.5.2.el9uek 5.15.0-1.43.4.1.el9uek 5.15.0-0.30.20.1.el9uek 5.15.0-102.110.5.el9uek 5.15.0-102.110.5.1.el9uek 5.15.0-103.114.4.el9uek 5.15.0-104.119.4.2.el9uek 5.15.0-0.30.19.el9uek 5.15.0-105.125.6.2.el9uek 5.15.0-105.125.6.2.1.el9uek 5.15.0-105.125.6.2.2.el9uek 5.15.0-106.131.4.el9uek 5.15.0-200.131.27.el9uek 5.15.0-200.131.27.1.el9uek 5.15.0-201.135.6.el9uek 5.15.0-202.135.2.el9uek 5.15.0-203.146.5.1.el9uek 5.15.0-204.147.6.2.el9uek 5.15.0-204.147.6.3.el9uek 5.15.0-205.149.5.1.el9uek 5.15.0-205.149.5.4.el9uek 5.15.0-206.153.7.el9uek 5.15.0-206.153.7.1.el9uek 5.15.0-207.156.6.el9uek 5.15.0-208.159.3.el9uek 5.15.0-208.159.3.2.el9uek 5.15.0-209.161.7.el9uek 5.15.0-209.161.7.1.el9uek 5.15.0-209.161.7.2.el9uek 5.15.0-210.163.7.el9uek 5.15.0-300.163.18.el9uek 5.15.0-300.163.18.1.el9uek 5.15.0-300.163.18.1.1.el9uek 5.15.0-301.163.5.2.el9uek 5.15.0-302.167.6.el9uek 5.15.0-300.163.18.7.el9uek 5.15.0-302.167.6.1.el9uek 5.15.0-303.171.5.2.el9uek 5.15.0-303.171.5.2.1.el9uek 5.15.0-304.171.4.el9uek 5.15.0-304.171.4.1.el9uek 5.15.0-304.171.4.3.el9uek 5.15.0-303.171.5.2.2.el9uek 5.15.0-305.176.4.el9uek 5.15.0-306.177.4.el9uek 5.15.0-306.177.4.1.el9uek 5.15.0-307.178.5.el9uek 5.15.0-308.179.6.el9uek 5.15.0-308.179.6.2.el9uek 5.15.0-308.179.6.3.el9uek 5.15.0-309.180.4.el9uek 5.15.0-308.179.6.7.el9uek 5.15.0-309.180.4.2.el9uek 5.15.0-308.179.6.11.el9uek 5.15.0-310.184.5.2.el9uek 5.15.0-310.184.5.3.el9uek 5.15.0-311.185.9.el9uek 5.15.0-308.179.6.14.el9uek 5.15.0-312.187.5.el9uek 5.15.0-312.187.5.1.el9uek 5.15.0-312.187.5.2.el9uek 5.15.0-312.187.5.3.el9uek 5.15.0-308.179.6.16.el9uek 5.15.0-313.189.5.1.el9uek 5.15.0-313.189.5.2.el9uek 5.15.0-313.189.5.3.el9uek 5.15.0-314.193.5.3.el9uek 5.15.0-314.193.5.4.el9uek 5.15.0-314.193.5.5.el9uek 5.15.0-315.196.5.1.el9uek 5.15.0-315.196.5.2.el9uek 5.15.0-316.196.4.1.el9uek 5.15.0-316.196.4.2.el9uek 5.15.0-317.197.5.1.el9uek 5.15.0-317.197.5.2.el9uek 5.15.0-318.199.3.2.el9uek 5.15.0-318.199.3.2.1.el9uek 5.15.0-319.201.4.2.el9uek 5.15.0-319.201.4.3.el9uek 5.15.0-319.201.4.4.el9uek 5.15.0-319.201.4.6.el9uek 5.15.0-320.202.8.2.el9uek 5.15.0-320.202.8.3.el9uek 5.15.0-320.202.8.4.el9uek 5.15.0-320.202.8.5.el9uek 5.15.0-318.199.3.6.el9uek 5.15.0-321.202.5.el9uek 5.15.0-321.202.5.1.el9uek 5.15.0-321.202.5.2.el9uek 5.15.0-321.202.5.3.el9uek 5.15.0-322.203.3.2.el9uek 5.15.0-322.203.3.3.el9uek 5.15.0-322.203.3.4.el9uek 5.15.0-322.203.3.4.5.el9uek 5.15.0-308.179.6.18.el9uek 5.15.0-318.199.3.7.el9uek 5.15.0-322.203.3.5.el9uek 5.15.0-322.203.3.4.1.el9uek 5.15.0-323.211.3.3.el9uek 5.15.0-323.211.3.4.el9uek 5.15.0-323.211.3.5.el9uek 5.15.0-308.179.6.19.el9uek
Ubuntu 22.04	Planned	—
Ubuntu 22.04 AWS	Planned	—
Ubuntu 22.04 Azure	Planned	—
Ubuntu 24.04	Planned	—
Ubuntu 24.04 AWS	Planned	—
Ubuntu 26.04	Released	1 kernel 7.0.0-31.31

Release info

Copy page link

Open as a page

Advisory

CLSA-2025:1748945064

Operating system

CentOS 8.4 ELS

Published date

Nov 16, 2014

Project

Linux

Version

2.11.0-1~ubuntu16.04.1+tuxcare.els12

How to fix

Update command:

apt-get update
apt-get --only-upgrade install ansible*

Changelog

Insufficiently Random Passwords Leakage
Debian/patches/CVE-2020-10729.patch: Fix caching of Jinja2 expressions to prevent caching dynamic results
CVE-2020-10729

Updated packages

ansible_2.5.1+dfsg-1ubuntu0.1+tuxcare.els6_all.deb

CVE-2026-72020

Severity

Details

Overview

About vulnerability

Details

Statement

Fixes

Statement

KernelCare state

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