CVE-2026-101887 BlueALSA bluealsad LC3plus Decoder Division-by-Zero DoS
A Bluetooth-adjacent attacker can crash the BlueALSA daemon by sending a crafted RTP header with a zero frame count, causing a division-by-zero error.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-101887?
CVE-2026-101887 is a low-severity denial of service vulnerability in arkq bluez-alsa, published on 1 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-369
Which versions are affected by CVE-2026-101887?
How do I fix CVE-2026-101887?
No fix has been published for CVE-2026-101887 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-101887 being exploited?
There is no known exploitation of CVE-2026-101887 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-101887, GHSA-r27r-cp4v-gw48, UBUNTU-CVE-2026-101887.