Vulnerability · Published Oct 1, 2026 · Assigned by VulnCheck
CVE-2026-101887BlueALSA bluealsad LC3plus Decoder Division-by-Zero DoS
Low 3.5
In plain English
A low-severity security flaw in bluez-alsa from arkq. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 4% of all known vulnerabilities).
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | bluez-alsa | no fix listed | DEBIAN-CVE-2026-101887 |
| Debian:13 | bluez-alsa | no fix listed | DEBIAN-CVE-2026-101887 |
| Debian:14 | bluez-alsa | no fix listed | DEBIAN-CVE-2026-101887 |
| Ubuntu:22.04:LTS | bluez-alsa | no fix listed | UBUNTU-CVE-2026-101887 |
| Ubuntu:24.04:LTS | bluez-alsa | no fix listed | UBUNTU-CVE-2026-101887 |
| Ubuntu:26.04:LTS | bluez-alsa | no fix listed | UBUNTU-CVE-2026-101887 |
| Ubuntu:26.10 | bluez-alsa | no fix listed | UBUNTU-CVE-2026-101887 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| arkq | bluez-alsa | 0 – before 1a84465dd860d1be9dcf62339c6273e9e0632dd2 |
Weakness: CWE-369 · Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
References
- Patch Commit patch
- https://www.vulncheck.com/advisories/bluealsa-bluealsad-lc3plus-decoder-division-by-zero-dos third-party-advisory