CVE-2024-0646Kernel: ktls overwrites readonly memory pages when using function splice with a ktls socket as destination

Description

An out-of-bounds memory write flaw was found in the Linux kernel’s Transport Layer Security functionality in how a user calls a function splice with a ktls socket as the destination. This flaw allows a local user to crash or potentially escalate their privileges on the system.

Timeline

Scores

EPSS (exploitation in 30 days)

0.31% · top 76% of all CVEs (12 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: total

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.0.

Affected products

• kernel

  • affected < 6.7-rc5

• Red Hat · Red Hat Enterprise Linux 8

  • unaffected 0:4.18.0-513.18.1.rt7.320.el8_9 – < *

• Red Hat · Red Hat Enterprise Linux 8

  All versions: unaffected

• Red Hat · Red Hat Enterprise Linux 8

  • unaffected 0:4.18.0-513.18.1.el8_9 – < *

• Red Hat · Red Hat Enterprise Linux 8.2 Advanced Update Support

  • unaffected 0:4.18.0-193.128.1.el8_2 – < *

• Red Hat · Red Hat Enterprise Linux 8.2 Telecommunications Update Service

  • unaffected 0:4.18.0-193.128.1.rt13.179.el8_2 – < *

• Red Hat · Red Hat Enterprise Linux 8.2 Telecommunications Update Service

  • unaffected 0:4.18.0-193.128.1.el8_2 – < *

• Red Hat · Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions

  • unaffected 0:4.18.0-193.128.1.el8_2 – < *

• Red Hat · Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions

  All versions: unaffected

• Red Hat · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

  • unaffected 0:4.18.0-305.125.1.el8_4 – < *

• Red Hat · Red Hat Enterprise Linux 8.4 Telecommunications Update Service

  • unaffected 0:4.18.0-305.125.1.rt7.201.el8_4 – < *

• Red Hat · Red Hat Enterprise Linux 8.4 Telecommunications Update Service

  • unaffected 0:4.18.0-305.125.1.el8_4 – < *

• Red Hat · Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions

  • unaffected 0:4.18.0-305.125.1.el8_4 – < *

• Red Hat · Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions

  All versions: unaffected

• Red Hat · Red Hat Enterprise Linux 8.6 Extended Update Support

  • unaffected 0:4.18.0-372.91.1.el8_6 – < *

• Red Hat · Red Hat Enterprise Linux 8.6 Extended Update Support

  All versions: unaffected

• Red Hat · Red Hat Enterprise Linux 8.8 Extended Update Support

  All versions: unaffected

• Red Hat · Red Hat Enterprise Linux 8.8 Extended Update Support

  • unaffected 0:4.18.0-477.51.1.el8_8 – < *

• Red Hat · Red Hat Enterprise Linux 9

  • unaffected 0:5.14.0-362.24.1.el9_3 – < *

• Red Hat · Red Hat Enterprise Linux 9

  • unaffected 0:5.14.0-362.24.1.el9_3 – < *

• Red Hat · Red Hat Enterprise Linux 9

  All versions: unaffected

• Red Hat · Red Hat Enterprise Linux 9.0 Extended Update Support

  • unaffected 0:5.14.0-70.93.2.el9_0 – < *

• Red Hat · Red Hat Enterprise Linux 9.0 Extended Update Support

  • unaffected 0:5.14.0-70.93.1.rt21.165.el9_0 – < *

• Red Hat · Red Hat Enterprise Linux 9.0 Extended Update Support

  All versions: unaffected

• Red Hat · Red Hat Enterprise Linux 9.2 Extended Update Support

  • unaffected 0:5.14.0-284.52.1.el9_2 – < *

• Red Hat · Red Hat Enterprise Linux 9.2 Extended Update Support

  • unaffected 0:5.14.0-284.52.1.rt14.337.el9_2 – < *

• Red Hat · Red Hat Enterprise Linux 9.2 Extended Update Support

  All versions: unaffected

• Red Hat · Red Hat Virtualization 4 for Red Hat Enterprise Linux 8

  • unaffected 0:4.18.0-372.91.1.el8_6 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v5.8.6-22 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v5.8.6-11 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v6.8.1-407 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v5.8.6-19 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v1.0.0-479 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v5.8.6-7 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v0.4.0-247 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v5.8.6-5 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v1.1.0-227 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v5.8.1-470 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v2.9.6-14 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v5.8.6-2 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v5.8.6-24 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v5.8.6-10 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v0.1.0-525 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v0.1.0-224 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v0.28.1-56 – < *

• Red Hat · Red Hat Enterprise Linux 6

  All versions: unaffected

• Red Hat · Red Hat Enterprise Linux 7

  All versions: unaffected

• Red Hat · Red Hat Enterprise Linux 7

  All versions: unaffected

• Red Hat · Red Hat Enterprise Linux 9

  All versions: affected

What to do

Workaround: To mitigate this issue, prevent module tls from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2024-16438 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2024-0646](https://cveledger.app/badge/CVE-2024-0646.svg)](https://cveledger.app/cve/CVE-2024-0646)

Record last updated 4 Nov 2026, 21:07 UTC.