What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-04-10 · updated 2026-06-17
• Weakness: CWE-476

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

Affected products

• Linux kernel: from 5.5 before 5.10.82; from 5.11 before 5.15.5; 5.16-rc1 — fixed in 5.10.82, 5.15.5

How to fix

Upgrade to a fixed version: Linux kernel 5.10.82, 5.15.5. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3e6db079751afd527bf3db32314ae938dc571916
• https://git.kernel.org/stable/c/9404c4145542c23019a80ab1bb2ecf73cd057b10
• https://git.kernel.org/stable/c/a7d91625863d4ffed63b993b5e6dc1298b6430c9
• https://git.kernel.org/stable/c/3e6db079751afd527bf3db32314ae938dc571916
• https://git.kernel.org/stable/c/9404c4145542c23019a80ab1bb2ecf73cd057b10
• https://git.kernel.org/stable/c/a7d91625863d4ffed63b993b5e6dc1298b6430c9

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