CVE-2026-53253 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Bluetooth BNEP component users, and organizations using Linux-based systems should be aware of this vulnerability. The vulnerability can be exploited by a remote attacker to cause a denial-of-service (DoS) or potentially execute arbitrary code. Affected systems should apply the patch or mitigation as soon as possible.

Technical summary

The vulnerability is caused by the lack of input validation in the bnep_rx_frame function, which allows a BNEP peer to send a short BNEP SDU. The issue has been resolved by using skb_pull_data() to validate the fixed fields in bnep_rx_frame() and splitting the control handler to pass an opcode that has already been pulled. The patch also documents the UUID-size byte explicitly to prevent similar issues in the future.

Defensive priority

High priority should be given to applying the patch or mitigation for this vulnerability. Affected systems should be updated as soon as possible to prevent exploitation.

Recommended defensive actions

• Apply the patch to update the Linux kernel Bluetooth BNEP component
• Use skb_pull_data() to validate fixed fields in bnep_rx_frame()
• Split the control handler to pass an opcode that has already been pulled
• Document the UUID-size byte explicitly to prevent similar issues in the future
• Monitor Linux kernel updates and apply patches promptly

Evidence notes

The vulnerability was reported by an unknown source and has been resolved by the Linux kernel developers. The CVE record and NVD detail provide additional information about the vulnerability. The source item URL provides access to the NVD JSON data for this CVE.

Official resources