CVE-2023-32248 | Tree connection null pointer dereference denial-of-service vulnerability

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.

Published: 2023-07-24 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-32248 is rated Low Risk (35.5/100): CVSS High severity, with low exploitation likelihood (EPSS 0.11%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-32248

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-11-21 7.29% 0.11% -7.18%
2 2025-11-18 0.11% 7.29% +7.18%
3 2025-04-15 — 0.11% —

Full EPSS history (17 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-32248

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2023-32248

OS Trackers for CVE-2023-32248

vendor priority summary link
debian unimportant CVE-2023-32248 unimportant priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2023-32248
redhat high — https://access.redhat.com/security/cve/CVE-2023-32248
suse high CVE-2023-32248 severity important: SUSE including 14 source package names (kernel-default, kernel-default-base, …), 256 product×package rows across 56 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 7, … (56 product lines)): Known Not Affected 256. https://www.suse.com/security/cve/CVE-2023-32248/
ubuntu medium CVE-2023-32248 medium priority: Ubuntu including 167 source packages (linux, linux-allwinner, …), 1970 status rows across 13 suites (bionic, focal, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 1512, released 180, not-affected 171, ignored 107. https://ubuntu.com/security/CVE-2023-32248

Affected software / configurations for CVE-2023-32248

Vendor Product Version Raw CPE
linux linux_kernel >= 5.15, < 5.15.111 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 5.16, < 6.1.28 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.2, < 6.2.15 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.3, < 6.3.2 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
netapp h300s — cpe:2.3:h:netapp:h300s:-:*:*:*:*:*:*:*
netapp h410c — cpe:2.3:h:netapp:h410c:-:*:*:*:*:*:*:*
netapp h410s — cpe:2.3:h:netapp:h410s:-:*:*:*:*:*:*:*
netapp h500s — cpe:2.3:h:netapp:h500s:-:*:*:*:*:*:*:*
netapp h700s — cpe:2.3:h:netapp:h700s:-:*:*:*:*:*:*:*

References for CVE-2023-32248

cvelogic Threat Intelligence