CVE-2023-1192 Use-after-free in smb2_is_status_io_timeout()

What is CVE-2023-1192?

CVE-2023-1192 is a medium-severity use after free vulnerability in Linux kernel, published on 1 Nov 2023. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A use-after-free flaw was found in smb2_is_status_io_timeout() in CIFS in the Linux Kernel. After CIFS transfers response data to a system call, there are still local variable points to the memory region, and if the system call frees it faster than CIFS uses it, CIFS will access a free memory region, leading to a denial of service.

Weakness: CWE-416

Which versions are affected by CVE-2023-1192?

It affects 2 products.

Products include Linux kernel, Redhat Enterprise Linux.

How do I fix CVE-2023-1192?

Apply the vendor's patch.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2023-1192 being exploited?

There is no known exploitation of CVE-2023-1192 in the wild and no public exploit code.

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-31853, DEBIAN-CVE-2023-1192, GHSA-r277-j8m2-3x97, ROOT-OS-DEBIAN-11-CVE-2023-1192, UBUNTU-CVE-2023-1192.