cve 2025 21969

About this tag
CVE-2025-21969 is a Linux kernel vulnerability in the Bluetooth L2CAP implementation, specifically a slab use-after-free in l2cap_send_cmd that can cause kernel memory corruption and denial-of-service. The flaw has been fixed upstream by synchronizing the HCI receive path with an hci device lock. System administrators and device vendors should prioritize patching kernels in the vulnerable series. This tag covers discussion of the vulnerability, its impact, and the upstream fix.

  1. Linux Bluetooth CVE-2025-21969: Kernel Use-After-Free in L2CAP Fixed Upstream

    A newly disclosed Linux-kernel vulnerability in the Bluetooth L2CAP implementation — tracked as CVE-2025-21969 — is a slab use-after-free in l2cap_send_cmd that can trigger kernel memory corruption and sustained denial-of-service, and it has been fixed upstream by synchronizing the HCI receive...
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