CVE-2020-35499

Severity: medium (CVSS 6.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-02-19 · updated 2026-06-17
Weakness: CWE-476

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.

Affected products

Linux kernel: from 5.10 before 5.10.4 — fixed in 5.10.4

How to fix

Upgrade to a fixed version: Linux kernel 5.10.4. Check the vendor advisory for mitigations.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1910048
https://bugzilla.redhat.com/show_bug.cgi?id=1910048

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