SB20260919129 - Improper input validation in Linux kernel bluetooth rfcomm
Published: September 19, 2026
Security Bulletin ID
SB20260919129
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Adjecent network
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper input validation (CVE-ID: CVE-2026-90088)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in rfcomm_apply_pn() when processing remote parameter negotiation frames. A remote attacker can send a parameter negotiation frame with an MTU value of zero to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/3988cbb1be501dbff909a2ee024670e3c955a66d
- https://git.kernel.org/stable/c/44c98fd082eafd49d55a8a4077ff488175b2fe24
- https://git.kernel.org/stable/c/9b2e5f1928c99224345a9ed8c5dae5fc74964d6d
- https://git.kernel.org/stable/c/aeee917a4878af95f0c63e18c5f22eaf6299c7b8
- https://git.kernel.org/stable/c/cbc2962da99b6b89345267d3aa74b4b573340548
- https://git.kernel.org/stable/c/e7c0aa45ae6c5a338661b23812bfcdef50bf3e96
- https://git.kernel.org/stable/c/f561e44261344adadf9d6a6dff31e3af9776d5c6
- https://git.kernel.org/stable/c/fc4851ff8dfb505e9a19efcc286712132bbd178d