CVE-2023-32248: Linux Kernel ksmbd Tree Connection NULL Pointer Dereference Denial-of-Service Vulnerability
First published: Wed Jul 05 2023(Updated: )
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.
Credit: secalert@redhat.com secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <6.4 | 6.4 |
| Red Hat Kernel-devel | ||
| Linux Kernel | <=6.3.9 | |
| Linux Kernel | >=5.15<5.15.111 | |
| Linux Kernel | >=5.16<6.1.28 | |
| Linux Kernel | >=6.2<6.2.15 | |
| Linux Kernel | >=6.3<6.3.2 | |
| NetApp H300S Firmware | ||
| NetApp H410C Firmware | ||
| NetApp H410S Firmware | ||
| NetApp H500e Firmware | ||
| NetApp H700S | ||
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.128-1 6.12.20-1 6.12.21-1 |
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Reference Links
- https://access.redhat.com/security/cve/CVE-2023-32248
- https://www.zerodayinitiative.com/advisories/ZDI-CAN-20479/
- https://bugzilla.redhat.com/show_bug.cgi?id=2219818
- https://security.netapp.com/advisory/ntap-20230915-0006/
- https://launchpad.net/bugs/cve/CVE-2023-32248
- https://github.com/torvalds/linux/commit/3ac00a2ab69b34189942afa9e862d5170cdcb018
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-32248
- https://nvd.nist.gov/vuln/detail/CVE-2023-32248
- https://security-tracker.debian.org/tracker/CVE-2023-32248
- https://ubuntu.com/security/CVE-2023-32248
- https://git.kernel.org/linus/3ac00a2ab69b34189942afa9e862d5170cdcb018
Frequently Asked Questions
What is the severity of CVE-2023-32248?
CVE-2023-32248 has a medium severity rating due to its exploitation potential affecting the Linux kernel's ksmbd.
How do I fix CVE-2023-32248?
To mitigate CVE-2023-32248, update your Linux kernel to version 6.4 or later, or to the fixed versions if using the Debian Linux package.
Which Linux kernel versions are affected by CVE-2023-32248?
CVE-2023-32248 affects Linux kernel versions from 5.15 up to 6.3.9 but is resolved in version 6.4 and subsequent releases.
What components are affected by CVE-2023-32248?
CVE-2023-32248 specifically impacts the ksmbd component in the Linux kernel, which functions as an in-kernel SMB server.
Is CVE-2023-32248 remotely exploitable?
Yes, CVE-2023-32248 can be exploited remotely due to improper validation of pointers within SMB commands.
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