CVE-2020-35499 Null dereference in kernel

What is CVE-2020-35499?

CVE-2020-35499 is a medium-severity vulnerability in Linux kernel, published on 19 Feb 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A NULL pointer dereference flaw in Linux kernel versions prior to 5.11 may be seen if sco_sock_getsockopt function in net/bluetooth/sco.c do not have a sanity check for a socket connection, when using BT_SNDMTU/BT_RCVMTU for SCO sockets. This could allow a local attacker with a special user privilege to crash the system (DOS) or leak kernel internal information.

Weakness: CWE-476

Which versions are affected by CVE-2020-35499?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2020-35499?

Apply the vendor's patch.

Is CVE-2020-35499 being exploited?

There is no known exploitation of CVE-2020-35499 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-6527, DEBIAN-CVE-2020-35499, GHSA-3m4x-gq6q-g6qr, UBUNTU-CVE-2020-35499.