CVE-2024-0646

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

HIGH
7.8
CVSS Score
Published: January 17, 2024 at 03:16 PM UTC
Updated: August 6, 2026 at 10:16 PM UTC
2 products affected across 2 vendorsLinux KernelEnterprise Linux

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Severity
HIGH7.8
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

4.20 ≤ v < 5.4.2675.11 ≤ v < 5.15.1475.16 ≤ v < 6.1.695.5 ≤ v < 5.10.2086.2 ≤ v < 6.6.76.7 rc16.7 rc26.7 rc36.7 rc4
Affected range stops below 5.10.208, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.15.147, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.4.267, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.1.69, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.6.7, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 0:4.18.0-193.128.1.el8_2 (unaffected)
Vendor states this is fixed in 0:4.18.0-193.128.1.rt13.179.el8_2 (unaffected)
Vendor states this is fixed in 0:4.18.0-305.125.1.el8_4 (unaffected)
Vendor states this is fixed in 0:4.18.0-305.125.1.rt7.201.el8_4 (unaffected)
Vendor states this is fixed in 0:4.18.0-372.91.1.el8_6 (unaffected)
Vendor states this is fixed in 0:4.18.0-477.51.1.el8_8 (unaffected)
Vendor states this is fixed in 0:4.18.0-513.18.1.el8_9 (unaffected)
Vendor states this is fixed in 0:4.18.0-513.18.1.rt7.320.el8_9 (unaffected)
Vendor states this is fixed in 0:5.14.0-284.52.1.el9_2 (unaffected)
Vendor states this is fixed in 0:5.14.0-284.52.1.rt14.337.el9_2 (unaffected)
Vendor states this is fixed in 0:5.14.0-362.24.1.el9_3 (unaffected)
Vendor states this is fixed in 0:5.14.0-70.93.1.rt21.165.el9_0 (unaffected)
Vendor states this is fixed in 0:5.14.0-70.93.2.el9_0 (unaffected)
Vendor states this is fixed in 6 (unaffected)
Vendor states this is fixed in 7 (unaffected)
Vendor states this is fixed in 8 (unaffected)

References (26)

Vendor Advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/errata/RHSA-2024:0723
Vendor Advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/errata/RHSA-2024:0724
Vendor Advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/errata/RHSA-2024:0725
Vendor Advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/errata/RHSA-2024:0850
Vendor Advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/errata/RHSA-2024:0851
Vendor Advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/errata/RHSA-2024:0876
Vendor Advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/errata/RHSA-2024:0881
Vendor Advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/errata/RHSA-2024:0897

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-787

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