CVE-2023-32248: Tree connection null pointer dereference denial-of-service vulnerability
Vulnerability summary
CVE-2023-32248 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in linux linux_kernel. EPSS estimates a 4.06% chance of exploitation in the next 30 days, higher than 90.6% of scored vulnerabilities.
Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 4% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 4 · Related 4Timeline
- 24-07-2023PublishedVulnerability first disclosed.
- 02-08-2024Last 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 handling of SMB2_TREE_CONNECT and SMB2_QUERY_INFO commands. The issue results from the lack of proper validation of a pointer prior to accessing it. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
4.06%
Chance of exploitation in the next 30 days
Percentile
91%
Versus all other CVEs
30-day change
No change 0.00 pp
From 4.06% 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.
Ubuntu83 products
- linux< 5.15.0-79.86
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 5.15.0-1042.47
- 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, < 5.15.111 | ≥ 5.16, < 6.1.28 | ≥ 6.2, < 6.2.15 | ≥ 6.3, < 6.3.2
4 vendors · 90 products
References
14 links- bugzilla.redhat.com/show_bug.cgi?id=2219818Issue TrackingX Refsource REDHATPatchThird Party Advisory
- security.netapp.com/advisory/ntap-20230915-0006/Third Party Advisory
