CVE-2023-32257: Session race condition remote code execution vulnerability
Vulnerability summary
CVE-2023-32257 is a high (CVSS 8.1) vulnerability in linux linux_kernel. EPSS estimates a 2.37% chance of exploitation in the next 30 days, higher than 83.8% of scored vulnerabilities.
Severe, CVSS 8.1 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 2% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 7 · Related 7Timeline
- 24-07-2023PublishedVulnerability first disclosed.
- 29-07-2025Last modifiedVulnerability information updated.
Description
A flaw was found in the Linux kernel's ksmbd, a high-performance in-kernel SMB server. The specific flaw exists within the processing of SMB2_SESSION_SETUP and SMB2_LOGOFF commands. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this vulnerability to execute code in the context of the kernel.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST8.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
2.37%
Chance of exploitation in the next 30 days
Percentile
84%
Versus all other CVEs
30-day change
No change 0.00 pp
From 2.37% 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 cause- CWE-362Concurrent Execution using Shared Resource with Improper SynchronizationThe product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
- CWE-667Improper LockingThe product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors.
Affected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu91 products
- linux< 5.15.0-94.104
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 5.15.0-1053.58
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Netapp5 products
Debian1 product
- linux< 6.1.37-1 | < 6.3.7-1
Linux1 product
- linux_kernel≥ 5.15, < 5.15.145 | ≥ 5.16, < 6.1.29 | ≥ 6.2, < 6.2.16 | ≥ 6.3, < 6.3.2
4 vendors · 98 products
References
16 links- bugzilla.redhat.com/show_bug.cgi?id=2219806Issue TrackingX Refsource REDHATPatchThird Party Advisory
