9.1

CVE-2023-52442: ksmbd: validate session id and tree id in compound request

Modified
AliasesUBUNTU-CVE-2023-52442DEBIAN-CVE-2023-52442
Published 21-02-2024Last modified 05-08-2026

Vulnerability summary

CVE-2023-52442 is a critical (CVSS 9.1) vulnerability in linux. EPSS estimates a 29.64% chance of exploitation in the next 30 days, higher than 98.1% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.1 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 30% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.1/10
010
Critical · v3.1 (CVE.org)
EPSS score
29.64%
0%100%
High · 0.00 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 2 · Duplicates 1 · Related 2
USN-6725-1USN-6725-2CVE-2023-39177

Timeline

  1. 21-02-2024
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate session id and tree id in compound request `smb2_get_msg()` in smb2_get_ksmbd_tcon() and smb2_check_user_session() will always return the first request smb2 header in a compound request. if `SMB2_TREE_CONNECT_HE` is the first command in compound request, will return 0, i.e. The tree id check is skipped. This patch use ksmbd_req_buf_next() to get current command in compound.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

29.64%

Chance of exploitation in the next 30 days

Percentile

98%

Versus all other CVEs

30-day change

No change 0.00 pp

From 29.64% 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.

Ubuntu66 products
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
  • linux-aws-5.13All versions (No fix recorded)
  • linux-aws-5.19All versions (No fix recorded)
Linux2 products
  • linux≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < 017d85c94f02090a87f4a473dbe0d6ee0da72693 | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < becb5191d1d5fdfca0198a2e37457bbbf4fe266f | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < 4c2b350b2e269e3fd17bbfa42de1b42775b777ac | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < 3df0411e132ee74a87aa13142dfd2b190275332e | 5.15
  • linux_kernel≥ 5.15, < 5.15.145 | ≥ 5.16, < 6.1.53 | ≥ 6.2, < 6.4.16 | 6.5:rc1 | 6.5:rc2 | 6.5:rc3
Debian1 product
  • linux< 6.1.55-1 | < 6.5.3-1

3 vendors · 69 products

References

10 links