CVE-2023-6606 Kernel: out-of-bounds read vulnerability in smbcalcsize

What is CVE-2023-6606?

CVE-2023-6606 is a high-severity vulnerability in Linux kernel, published on 8 Dec 2023. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An out-of-bounds read vulnerability was found in smbCalcSize in fs/smb/client/netmisc.c in the Linux Kernel. This issue could allow a local attacker to crash the system or leak internal kernel information.

Weakness: CWE-125

Which versions are affected by CVE-2023-6606?

It affects 5 products.

Products include Linux kernel, Redhat Enterprise Linux, Redhat Enterprise Linux Eus, Redhat Enterprise Linux Server Aus, Redhat Enterprise Linux Server for Power Little Endian Update Services for Sap Solutions.

How do I fix CVE-2023-6606?

Apply the vendor's patch.

Is CVE-2023-6606 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-6606 exists.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-51470, BELL-CVE-2023-6606, DEBIAN-CVE-2023-6606, GHSA-4m6w-vxqg-9rmm, UBUNTU-CVE-2023-6606, openSUSE-SU-2024:13547-1.