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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-43383

34
FAUCET Score

In the Linux kernel, the following vulnerability has been resolved: net/tcp-md5: Fix MAC comparison to be constant-time To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this.

First published: May 8, 2026Last modified: Jun 19, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.6.20, < 5.10.253CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 5.11, < 6.1.167CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 6.2, < 6.6.130CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 6.7, < 6.12.78CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 6.13, < 6.18.19CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.4CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.5
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.44%
Probability of exploitation in next 30 days
EPSS Percentile
36.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0044 is in the 13th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (108)

ubuntupatch availablevia ubuntu_usn
Product: linux-azure-fde-6.8 (jammy)Fixed in: 6.8.0-1062.69~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-fde (noble)Fixed in: 6.8.0-1062.69
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-6.8 (jammy)Fixed in: 6.8.0-1063.71~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-azure (noble)Fixed in: 6.8.0-1063.71
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-fde-6.17 (noble)Fixed in: 6.17.0-1018.18~24.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-6.17 (noble)Fixed in: 6.17.0-1021.21~24.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-kvm (focal)Fixed in: 5.4.0-1148.157
ubuntupatch availablevia ubuntu_usn
Product: linux-ibm-5.4 (bionic)Fixed in: 5.4.0-1107.112~18.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-ibm (focal)Fixed in: 5.4.0-1107.112
ubuntupatch availablevia ubuntu_usn
Product: linux-aws-5.4 (bionic)Fixed in: 5.4.0-1161.172~18.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-5.4 (bionic)Fixed in: 5.4.0-1166.172~18.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp-5.4 (bionic)Fixed in: 5.4.0-1164.173~18.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-hwe-5.4 (bionic)Fixed in: 5.4.0-233.253~18.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-oracle-5.4 (bionic)Fixed in: 5.4.0-1159.169~18.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux (focal)Fixed in: 5.4.0-233.253
ubuntupatch availablevia ubuntu_usn
Product: linux-aws (focal)Fixed in: 5.4.0-1161.172
ubuntupatch availablevia ubuntu_usn
Product: linux-aws-fips (focal)Fixed in: 5.4.0-1161.172+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-azure (focal)Fixed in: 5.4.0-1166.172
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-fips (focal)Fixed in: 5.4.0-1166.172+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-bluefield (focal)Fixed in: 5.4.0-1120.127
ubuntupatch availablevia ubuntu_usn
Product: linux-fips (focal)Fixed in: 5.4.0-1135.145
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp (focal)Fixed in: 5.4.0-1164.173
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp-fips (focal)Fixed in: 5.4.0-1164.173+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-iot (focal)Fixed in: 5.4.0-1065.68
ubuntupatch availablevia ubuntu_usn
Product: linux-oracle (focal)Fixed in: 5.4.0-1159.169
ubuntupatch availablevia ubuntu_usn
Product: linux-xilinx-zynqmp (focal)Fixed in: 5.4.0-1079.83
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-fips (jammy)Fixed in: 5.15.0-1116.125+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-aws-6.8 (jammy)Fixed in: 6.8.0-1060.63~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp-6.8 (jammy)Fixed in: 6.8.0-1063.69~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-ibm-6.8 (jammy)Fixed in: 6.8.0-1060.61~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-oracle-6.8 (jammy)Fixed in: 6.8.0-1057.58~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-gke (noble)Fixed in: 6.8.0-1058.64
ubuntupatch availablevia ubuntu_usn
Product: linux-gkeop (noble)Fixed in: 6.8.0-1045.48
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia-lowlatency (noble)Fixed in: 6.8.0-1058.61.1
ubuntupatch availablevia ubuntu_usn
Product: linux-realtime-6.17 (noble)Fixed in: 6.17.0-1017.19~24.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-realtime (questing)Fixed in: 6.17.0-1017.19
ubuntupatch availablevia ubuntu_usn
Product: linux-aws-6.17 (noble)Fixed in: 6.17.0-1019.19~24.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp-6.17 (noble)Fixed in: 6.17.0-1020.22~24.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-oracle-6.17 (noble)Fixed in: 6.17.0-1018.18~24.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux (questing)Fixed in: 6.17.0-40.40
ubuntupatch availablevia ubuntu_usn
Product: linux-aws (questing)Fixed in: 6.17.0-1019.19
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp (questing)Fixed in: 6.17.0-1020.22
ubuntupatch availablevia ubuntu_usn
Product: linux-oracle (questing)Fixed in: 6.17.0-1018.18
ubuntupatch availablevia ubuntu_usn
Product: linux-aws-5.15 (focal)Fixed in: 5.15.0-1111.118~20.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-5.15 (focal)Fixed in: 5.15.0-1116.125~20.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-fde-5.15 (focal)Fixed in: 5.15.0-1116.125~20.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-hwe-5.15 (focal)Fixed in: 5.15.0-185.195~20.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-ibm-5.15 (focal)Fixed in: 5.15.0-1105.109~20.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-lowlatency-hwe-5.15 (focal)Fixed in: 5.15.0-183.193~20.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia-tegra-5.15 (focal)Fixed in: 5.15.0-1063.63~20.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux (jammy)Fixed in: 5.15.0-185.195
ubuntupatch availablevia ubuntu_usn
Product: linux-aws (jammy)Fixed in: 5.15.0-1111.118
ubuntupatch availablevia ubuntu_usn
Product: linux-aws-fips (jammy)Fixed in: 5.15.0-1111.118+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-azure (jammy)Fixed in: 5.15.0-1116.125
ubuntupatch availablevia ubuntu_usn
Product: linux-fips (jammy)Fixed in: 5.15.0-185.195+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp (jammy)Fixed in: 5.15.0-1111.121
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp-fips (jammy)Fixed in: 5.15.0-1111.121+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-gke (jammy)Fixed in: 5.15.0-1107.113
ubuntupatch availablevia ubuntu_usn
Product: linux-gkeop (jammy)Fixed in: 5.15.0-1094.102
ubuntupatch availablevia ubuntu_usn
Product: linux-ibm (jammy)Fixed in: 5.15.0-1105.109
ubuntupatch availablevia ubuntu_usn
Product: linux-intel-iot-realtime (jammy)Fixed in: 5.15.0-1103.105
ubuntupatch availablevia ubuntu_usn
Product: linux-intel-iotg (jammy)Fixed in: 5.15.0-1106.112
ubuntupatch availablevia ubuntu_usn
Product: linux-kvm (jammy)Fixed in: 5.15.0-1103.108
ubuntupatch availablevia ubuntu_usn
Product: linux-lowlatency (jammy)Fixed in: 5.15.0-183.193
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia (jammy)Fixed in: 5.15.0-1106.107
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia-tegra (jammy)Fixed in: 5.15.0-1063.63
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia-tegra-igx (jammy)Fixed in: 5.15.0-1052.52
ubuntupatch availablevia ubuntu_usn
Product: linux-oracle (jammy)Fixed in: 5.15.0-1108.114
ubuntupatch availablevia ubuntu_usn
Product: linux-realtime (jammy)Fixed in: 5.15.0-1110.119
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia-6.8 (jammy)Fixed in: 6.8.0-1058.61~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-realtime-6.8 (jammy)Fixed in: 6.8.1-1055.56~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux (noble)Fixed in: 6.8.0-134.134
ubuntupatch availablevia ubuntu_usn
Product: linux-aws (noble)Fixed in: 6.8.0-1060.63
ubuntupatch availablevia ubuntu_usn
Product: linux-aws-fips (noble)Fixed in: 6.8.0-1060.63+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp (noble)Fixed in: 6.8.0-1063.69
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp-fips (noble)Fixed in: 6.8.0-1063.69+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-ibm (noble)Fixed in: 6.8.0-1060.61
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia (noble)Fixed in: 6.8.0-1058.61
ubuntupatch availablevia ubuntu_usn
Product: linux-oracle (noble)Fixed in: 6.8.0-1057.58
ubuntupatch availablevia ubuntu_usn
Product: linux-realtime (noble)Fixed in: 6.8.1-1055.56
ubuntupatch availablevia ubuntu_usn
Product: linux-oem-6.17 (noble)Fixed in: 6.17.0-1028.28
ubuntupatch availablevia ubuntu_usn
Product: linux (trusty)Fixed in: 3.13.0-214.265
ubuntupatch availablevia ubuntu_usn
Product: linux-oracle-5.15 (focal)Fixed in: 5.15.0-1108.114~20.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-xilinx (noble)Fixed in: 6.8.0-1032.33
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia-tegra (noble)Fixed in: 6.8.0-1029.30
ubuntupatch availablevia ubuntu_usn
Product: linux-lowlatency-hwe-6.8 (jammy)Fixed in: 6.8.0-134.134.1~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-lowlatency (noble)Fixed in: 6.8.0-134.134.1
ubuntupatch availablevia ubuntu_usn
Product: linux-raspi-realtime (noble)Fixed in: 6.8.0-2049.50
ubuntupatch availablevia ubuntu_usn
Product: linux-aws (bionic)Fixed in: 4.15.0-1194.207
ubuntupatch availablevia ubuntu_usn
Product: linux-aws-fips (bionic)Fixed in: 4.15.0-2132.138
ubuntupatch availablevia ubuntu_usn
Product: linux (bionic)Fixed in: 4.15.0-253.265
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-4.15 (bionic)Fixed in: 4.15.0-1204.219
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-fips (bionic)Fixed in: 4.15.0-2112.118
ubuntupatch availablevia ubuntu_usn
Product: linux-fips (bionic)Fixed in: 4.15.0-1149.161
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp-4.15 (bionic)Fixed in: 4.15.0-1187.204
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp-fips (bionic)Fixed in: 4.15.0-2095.101
ubuntupatch availablevia ubuntu_usn
Product: linux-kvm (bionic)Fixed in: 4.15.0-1176.181
ubuntupatch availablevia ubuntu_usn
Product: linux-oracle (bionic)Fixed in: 4.15.0-1156.167
ubuntupatch availablevia ubuntu_usn
Product: linux-xilinx-zynqmp (jammy)Fixed in: 5.15.0-1074.78
ubuntupatch availablevia ubuntu_usn
Product: linux-raspi (jammy)Fixed in: 5.15.0-1105.108
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-fips (noble)Fixed in: 6.8.0-1062.69+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-fips (noble)Fixed in: 6.8.0-134.134+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-hwe-6.17 (noble)Fixed in: 6.17.0-40.40~24.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-aws (trusty)Fixed in: 4.4.0-1156.162
ubuntupatch availablevia ubuntu_usn
Product: linux-lts-xenial (trusty)Fixed in: 4.4.0-283.317~14.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-fips (xenial)Fixed in: 4.4.0-1126.133
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp-5.15 (focal)Fixed in: 5.15.0-1111.121~20.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-intel-iotg-5.15 (focal)Fixed in: 5.15.0-1106.112~20.04.1

Vendor Advisories (29)

ubuntuUSN-8617-1

Linux kernel (KVM) vulnerabilities

Jul 28, 2026
ubuntuUSN-8616-1

Linux kernel (IBM) vulnerabilities

Jul 28, 2026
ubuntuUSN-8615-1

Linux kernel vulnerabilities

Jul 28, 2026
ubuntuUSN-8547-2

Linux kernel (Azure FIPS) vulnerabilities

Jul 28, 2026
ubuntuUSN-8609-1

Linux kernel (Azure CVM) vulnerabilities

Jul 24, 2026
ubuntuUSN-8607-1

Linux kernel (Azure CVM) vulnerabilities

Jul 24, 2026
ubuntuUSN-8606-1

Linux kernel (Azure) vulnerabilities

Jul 24, 2026
ubuntuUSN-8605-1

Linux kernel (Azure CVM) vulnerabilities

Jul 24, 2026
ubuntuUSN-8604-1

Linux kernel (Azure) vulnerabilities

Jul 24, 2026
ubuntuUSN-8490-2

Linux kernel (Real-time) vulnerabilities

Jul 17, 2026
ubuntuUSN-8548-1

Linux kernel vulnerabilities

Jul 15, 2026
ubuntuUSN-8547-1

Linux kernel vulnerabilities

Jul 15, 2026
ubuntuUSN-8545-1

Linux kernel (HWE) vulnerabilities

Jul 15, 2026
ubuntuUSN-8530-1

Linux kernel (AWS) vulnerabilities

Jul 10, 2026
ubuntuUSN-8529-1

Linux kernel vulnerabilities

Jul 10, 2026
ubuntuUSN-8528-1

Linux kernel (Xilinx ZynqMP) vulnerabilities

Jul 10, 2026
ubuntuUSN-8527-1

Linux kernel (Raspberry Pi) vulnerabilities

Jul 10, 2026
ubuntuUSN-8492-5

Linux kernel (FIPS) vulnerabilities

Jul 10, 2026
ubuntuUSN-8492-3

Linux kernel (Raspberry Pi Real-time) vulnerabilities

Jul 6, 2026
ubuntuUSN-8501-1

Linux kernel vulnerabilities

Jul 2, 2026
ubuntuUSN-8493-2

Linux kernel (Oracle) vulnerabilities

Jul 2, 2026
ubuntuUSN-8499-1

Linux kernel (Xilinx) vulnerabilities

Jul 2, 2026
ubuntuUSN-8498-1

Linux kernel (NVIDIA Tegra) vulnerabilities

Jul 2, 2026
ubuntuUSN-8497-1

Linux kernel (Low Latency) vulnerabilities

Jul 2, 2026
ubuntuUSN-8492-2

Linux kernel vulnerabilities

Jul 2, 2026
ubuntuUSN-8493-1

Linux kernel vulnerabilities

Jul 1, 2026
ubuntuUSN-8492-1

Linux kernel vulnerabilities

Jul 1, 2026
ubuntuUSN-8491-1

Linux kernel (OEM) vulnerabilities

Jul 1, 2026
ubuntuUSN-8490-1

Linux kernel vulnerabilities

Jul 1, 2026

References

git.kernel.org / stable/c/02669e2a4d207068edce7e8b5fafd85822018ce6
Patch
git.kernel.org / stable/c/345a9530756528d7ca407663d659c3c40e75c3dd
Patch
git.kernel.org / stable/c/46d0d6f50dab706637f4c18a470aac20a21900d3
Patch
git.kernel.org / stable/c/5d305a95130a8d08b9545e47f1e18d29d59866cb
Patch
git.kernel.org / stable/c/821c8751fdeecdeecabeb11704dd33439c9e4bbc
Patch
git.kernel.org / stable/c/ae3831b44f477de048287493e184fc3ff913b624
Patch
git.kernel.org / stable/c/b502e97e29d791ff7a8051f29a414535739be218
Patch
git.kernel.org / stable/c/ff44ec94d4fc8348600a69de0a8fa1102c23bce8