9.1

CVE-2023-4515: ksmbd: validate command request size

Modified
AliasesUBUNTU-CVE-2023-4515DEBIAN-CVE-2023-4515
Published 16-08-2025Last modified 05-08-2026

Vulnerability summary

CVE-2023-4515 is a critical (CVSS 9.1) vulnerability in linux. EPSS estimates a 0.31% chance of exploitation in the next 30 days, higher than 24.1% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.1 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.1/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.31%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 11 · Related 11
SUSE-SU-2025:03272-1SUSE-SU-2025:03290-1SUSE-SU-2025:03301-1SUSE-SU-2025:03382-1SUSE-SU-2025:03602-1SUSE-SU-2025:03633-1

Timeline

  1. 16-08-2025
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate command request size In commit 2b9b8f3b68ed ("ksmbd: validate command payload size"), except for SMB2_OPLOCK_BREAK_HE command, the request size of other commands is not checked, it's not expected. Fix it by add check for request size of other commands.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.31%

Chance of exploitation in the next 30 days

Percentile

24%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.30% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu106 products
  • linux< 5.15.0-91.101
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1051.56
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 35f450f54dca1519bb24faacd0428db09f89a11f, < 595679098bdcdbfbba91ebe07a2f7f208df93870 | ≥ 9650cf70ec9d94ff34daa088b643229231723c26, < c6bef3bc30fd4a175aef846b7d928a6c40d091cd | ≥ 2b9b8f3b68edb3d67d79962f02e26dbb5ae3808d, < ff7236b66d69582f90cf5616e63cfc3dc18142bb | ≥ 2b9b8f3b68edb3d67d79962f02e26dbb5ae3808d, < 5aa4fda5aa9c2a5a7bac67b4a12b089ab81fee3c | 768caf4019f0391c0b6452afe34cea1704133f7b | ≥ 5.15.121, < 5.15.127 | ≥ 6.1.36, < 6.1.46 | ≥ 6.3.10, < 6.4 | 6.4
  • linux_kernelEOL≥ 5.15.121, < 5.15.127 | ≥ 6.1.36, < 6.1.46 | ≥ 6.3.10, < 6.4 | ≥ 6.4.1, < 6.4.11 | 6.4 | 6.5:rc1 | 6.5:rc2 | 6.5:rc3 | 6.5:rc4 | 6.5:rc5
Debian1 product
  • linux< 6.1.52-1 | < 6.4.11-1

3 vendors · 109 products

References

8 links