CVE-2024-50286 ksmbd: fix slab-use-after-free in ksmbd_smb2_session_create

What is CVE-2024-50286?

CVE-2024-50286 is a critical use after free vulnerability in Linux kernel, published on 19 Nov 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: fix slab-use-after-free in ksmbd_smb2_session_create

There is a race condition between ksmbd_smb2_session_create and ksmbd_expire_session. This patch add missing sessions_table_lock while adding/deleting session from global session table.

Weakness: CWE-416

Which versions are affected by CVE-2024-50286?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2024-50286?

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-2024-50286 being exploited?

There is no known exploitation of CVE-2024-50286 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 BELL-CVE-2024-50286, DEBIAN-CVE-2024-50286, GHSA-jh47-c26g-fr5q, ROOT-OS-UBUNTU-2204-CVE-2024-50286, UBUNTU-CVE-2024-50286.