CVE-2024-0646: Kernel: ktls overwrites readonly memory pages when using function splice with a ktls socket as destination
Vulnerability summary
CVE-2024-0646 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in linux linux_kernel. EPSS estimates a 0.31% chance of exploitation in the next 30 days, higher than 23.7% of scored vulnerabilities.
Not severe (CVSS 7, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 32 · Related 11Timeline
- 17-01-2024PublishedVulnerability first disclosed.
- 06-08-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
5 scores · 5 sources · 1 version- CVE.orgCNA7.0HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:HDiffers
- OSV · Red hatEcosystem advisory · calculated7.0HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.31%
Chance of exploitation in the next 30 days
Percentile
24%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.31% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu112 products
- linux< 5.4.0-172.190 | < 5.15.0-97.107
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 5.4.0-1119.129 | < 5.15.0-1055.60
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Redhat22 products
- enterprise_linux8.0 | 9.0
- kpatch-patch-5_14_0-284_25_1< 0:1-6.el9_2
- kpatch-patch-5_14_0-284_25_1-debuginfo< 0:1-6.el9_2
- kpatch-patch-5_14_0-284_25_1-debugsource< 0:1-6.el9_2
- kpatch-patch-5_14_0-284_30_1< 0:1-3.el9_2
Debian1 product
- linux< 6.1.69-1 | < 6.6.8-1
Linux1 product
- linux_kernel≥ 4.20, < 5.4.267 | ≥ 5.5, < 5.10.208 | ≥ 5.11, < 5.15.147 | ≥ 5.16, < 6.1.69 | ≥ 6.2, < 6.6.7 | 6.7:rc1 | 6.7:rc2 | 6.7:rc3 | 6.7:rc4
4 vendors · 136 products
References
46 links- access.redhat.com/errata/RHSA-2024:0850Vendor AdvisoryX Refsource REDHATAdvisoryThird Party Advisory
Show all 46 references
- access.redhat.com/errata/RHSA-2024:1251Vendor AdvisoryX Refsource REDHATAdvisoryThird Party Advisory
