CVE-2020-35499

Local crash or kernel leak via SCO getsockopt

Published Feb 19, 2021 · Updated Aug 4, 2024

NULL pointer dereference in Linux Kernel before 5.11 allows local users to crash the system or leak kernel information via SCO socket options. The sco_sock_getsockopt function in net/bluetooth/sco.c dereferences a missing socket connection when handling BT_SNDMTU or BT_RCVMTU, causing a kernel NULL pointer fault. Exploitation requires local access with the relevant Bluetooth socket capability; the consequence is system denial of service or disclosure of kernel memory information.

CVSS severity6.7
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux Kernel before 5.11 allows local users to crash the system or leak kernel information via SCO socket options. The sco_sock_getsockopt function in net/bluetooth/sco.c dereferences a missing socket connection when handling BT_SNDMTU or BT_RCVMTU, causing a kernel NULL pointer fault. Exploitation requires local access with the relevant Bluetooth socket capability; the consequence is system denial of service or disclosure of kernel memory information.

The record

CVE
CVE-2020-35499
Published
Feb 19, 2021
Updated
Aug 4, 2024
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 19, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=kernel 5.11

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=kernel 5.11

Published CVSS scores

6.7NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
7.2NVDAV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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