CVE-2026-23006: 
Linux Kernel vulnerability analysis and mitigation

CVE-2026-23006 is a NULL pointer dereference vulnerability in the Linux kernel's ASoC (Audio System on Chip) tlv320adcx140 audio codec driver. The snd_soc_component field within the adcx140_priv structure was never initialized but was dereferenced to access the dev pointer, which is already available directly in adcx140_priv. The vulnerability was published on January 25, 2026, and affects Linux kernel versions 6.1.1–6.1.161, 6.2–6.6.121, 6.7–6.12.66, and 6.13–6.18.6, as well as 6.19 release candidates. It carries a CVSS v3.1 base score of 5.5 (Medium) (Red Hat Advisory, Red Hat Bugzilla).

The root cause is classified as CWE-476 (NULL Pointer Dereference). In the adcx140_priv structure used by the TI TLV320ADCX140 audio codec driver, the snd_soc_component pointer was referenced to obtain the dev device pointer during codec initialization or operation, but was never assigned a value. When the driver attempted to dereference this uninitialized pointer, it could trigger a kernel NULL pointer dereference. The fix removes the unnecessary snd_soc_component field usage and accesses dev directly from adcx140_priv, which already holds the correct reference. Exploitation requires local access with low privileges and no user interaction (Red Hat Advisory, Red Hat Bugzilla).

Successful exploitation results in a kernel panic or system crash, causing a denial of service through complete system unavailability. There is no impact on confidentiality or data integrity, as the vulnerability only affects availability. The attack is limited to the local system and does not enable lateral movement or data exfiltration; however, on systems where uptime is critical (e.g., embedded audio devices, servers with TLV320ADCX140 codec hardware), repeated triggering could cause persistent service disruption (Red Hat Advisory).

The vulnerability has been patched in the following Linux kernel stable releases: 6.1.162+, 6.6.122+, 6.12.67+, and 6.18.7+. Patch commits are available at git.kernel.org (commits 53bd838ed595, 61757f5191da, 659939d08e5f, 954260a32c21, and be7664c81d31). As a temporary workaround where patching is not immediately possible, restricting local system access to trusted users only reduces the attack surface, since exploitation requires local low-privilege access. Ubuntu security notices USN-8278-1, USN-8289-1, USN-8296-1, and their follow-up updates also address this vulnerability for Ubuntu users (Red Hat Advisory, Ubuntu USN-8278-1, Ubuntu USN-8289-1).