SB20260816189 - Improper resource shutdown or release in Linux kernel bluetooth

Description

This security bulletin contains information about 1 vulnerability.

1) Improper resource shutdown or release (CVE-ID: CVE-2026-74536)

CWE-ID: CWE-404 - Improper Resource Shutdown or Release

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper resource shutdown or release in iso_sock_kill() and ISO socket handling in net/bluetooth/iso.c when releasing and deleting Bluetooth ISO sockets concurrently. A local user can trigger concurrent socket release and connection deletion to cause a denial of service.

The issue results in a leaked socket reference because cleanup may be skipped and the socket destructor may never be called.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/96ed3c772c08e7a91c399567f412618e43231023
• https://git.kernel.org/stable/c/ce57442a379212fe3fda59c9437ee8217eceb5b1
• https://git.kernel.org/stable/c/e30e5ca63c8fbe3cd505fbb419bb547760cda633
• https://git.kernel.org/stable/c/e76a0ae6542ae43241b2147bacf4990e7ae5316a