CVE-2023-38426: linux linux_kernel Out-of-bounds Read
Vulnerability summary
CVE-2023-38426 is a critical (CVSS 9.1) Out-of-bounds Read vulnerability in linux linux_kernel. EPSS estimates a 3.04% chance of exploitation in the next 30 days, higher than 87.5% of scored vulnerabilities.
Severe, CVSS 9.1 (NVD); no exploitation reported by the 5 checked sources; EPSS 3% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 8 · Related 8Timeline
- 17-07-2023PublishedVulnerability first disclosed.
- 02-08-2024Last modifiedVulnerability information updated.
Description
An issue was discovered in the Linux kernel before 6.3.4. ksmbd has an out-of-bounds read in smb2_find_context_vals when create_context's name_len is larger than the tag length.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- OSV · DebianEcosystem advisory · calculated9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS trend
Probability
3.04%
Chance of exploitation in the next 30 days
Percentile
88%
Versus all other CVEs
30-day change
No change 0.00 pp
From 3.04% 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: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu88 products
- linux< 5.15.0-83.92
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 5.15.0-1044.49
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Netapp6 products
Debian1 product
- linux< 6.1.37-1 | < 6.3.7-1
Linux1 product
- linux_kernel≥ 5.15, < 5.15.113 | ≥ 5.16, < 6.1.30 | ≥ 6.2, < 6.3.4
4 vendors · 96 products
References
17 links- cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.3.4REPORTMailing ListRelease NotesThird Party Advisory
