Linux Kernel up to 7.1-rc2 Bluetooth l2cap_sock_get_sndtimeo_cb null pointer dereference

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.5$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.6.139/6.12.89/6.18.29/7.0.6/7.1-rc2. Affected by this vulnerability is the function l2cap_sock_get_sndtimeo_cb of the component Bluetooth. This manipulation causes null pointer dereference. This vulnerability is registered as CVE-2026-45836. The attack requires access to the local network. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.6.139/6.12.89/6.18.29/7.0.6/7.1-rc2. It has been declared as critical. Affected by this vulnerability is the function l2cap_sock_get_sndtimeo_cb of the component Bluetooth. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix null-ptr-deref in l2cap_sock_get_sndtimeo_cb() Add the same NULL guard already present in l2cap_sock_resume_cb() and l2cap_sock_ready_cb().

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2026-45836 since 05/13/2026. The exploitation appears to be easy. The attack can only be done within the local network. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 316804 (Linux Distros Unpatched Vulnerability : CVE-2026-45836), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.6.140, 6.12.90, 6.18.30, 7.0.7 or 7.1-rc3 eliminates this vulnerability. Applying the patch cf1fd517f892ded88168df878f834b625133f86d/58dc5e3d8768e121907608e6e196a908512fb083/32bd343803d4ba47cc516f9d5f037f01b855d767/a93d66907dd4d29b65c9797a93784bf61906d6d6/78a88d43dab8d23aeef934ed8ce34d40e6b3d613 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (316804). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 316804
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-45836

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.140/6.12.90/6.18.30/7.0.7/7.1-rc3
Patch: cf1fd517f892ded88168df878f834b625133f86d/58dc5e3d8768e121907608e6e196a908512fb083/32bd343803d4ba47cc516f9d5f037f01b855d767/a93d66907dd4d29b65c9797a93784bf61906d6d6/78a88d43dab8d23aeef934ed8ce34d40e6b3d613

Timelineinfo

05/13/2026 CVE reserved
05/26/2026 +13 days Advisory disclosed
05/26/2026 +0 days VulDB entry created
06/26/2026 +31 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-45836 (🔒)
GCVE (CVE): GCVE-0-2026-45836
GCVE (VulDB): GCVE-100-365695

Entryinfo

Created: 05/26/2026 19:36
Updated: 06/26/2026 22:10
Changes: 05/26/2026 19:36 (59), 05/29/2026 16:57 (2), 06/26/2026 22:10 (10)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Want to stay up to date on a daily basis?

Enable the mail alert feature now!