CVE-2021-47186 tipc: check for null after calling kmemdup

What is CVE-2021-47186?

CVE-2021-47186 is a medium-severity vulnerability in Linux kernel, published on 10 Apr 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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

tipc: check for null after calling kmemdup

kmemdup can return a null pointer so need to check for it, otherwise the null key will be dereferenced later in tipc_crypto_key_xmit as can be seen in the trace [1].

[1] https://syzkaller.appspot.com/bug?id=bca180abb29567b189efdbdb34cbf7ba851c2a58

Weakness: CWE-476

Which versions are affected by CVE-2021-47186?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2021-47186?

Apply the vendor's patch.

Is CVE-2021-47186 being exploited?

There is no known exploitation of CVE-2021-47186 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 DEBIAN-CVE-2021-47186, GHSA-vfmv-3fmr-wr8p, UBUNTU-CVE-2021-47186.