arkq bluez-alsa LC3plus sink decoder a2dp-lc3plus.c a2dp_lc3plus_dec_thread frame count divide by zero

Summaryinfo

A vulnerability was found in arkq bluez-alsa. It has been rated as problematic. This affects the function a2dp_lc3plus_dec_thread of the file a2dp-lc3plus.c of the component LC3plus sink decoder. The manipulation of the argument frame count leads to divide by zero. This vulnerability is referenced as CVE-2026-101887. Remote exploitation of the attack is possible. No exploit is available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability was found in arkq bluez-alsa (version unknown) and classified as problematic. This issue affects the function a2dp_lc3plus_dec_thread of the file a2dp-lc3plus.c of the component LC3plus sink decoder. The manipulation of the argument frame count with an unknown input leads to a divide by zero vulnerability. Using CWE to declare the problem leads to CWE-369. The product divides a value by zero. Impacted is integrity, and availability. The summary by CVE is:

BlueALSA (bluez-alsa/bluealsad) contains a division-by-zero vulnerability in the LC3plus sink decoder (a2dp-lc3plus.c, a2dp_lc3plus_dec_thread) that allows a Bluetooth-adjacent attacker to crash the daemon by sending a crafted RTP media header with an attacker-controlled frame count field set to zero. Attackers can establish an A2DP source connection with an LC3plus session negotiated against a victim running bluealsad as an A2DP sink and transmit a non-fragmented LC3plus media header with a zero frame count to trigger a SIGFPE in the decoding thread, causing a denial of service on builds compiled with LC3plus support enabled.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-101887 since 09/28/2026. The exploitation is known to be easy. The attack may be initiated remotely. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Applying the patch 1a84465dd860d1be9dcf62339c6273e9e0632dd2 is able to eliminate this problem.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-90456). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• arkq

Name

• bluez-alsa

Website

• Product: https://github.com/arkq/bluez-alsa/

CPE 2.3info

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CPE 2.2info

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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