CVE-2025-71222: 
Linux Kernel vulnerability analysis and mitigation

CVE-2025-71222 is a denial-of-service vulnerability in the Linux kernel's wlcore WiFi driver caused by insufficient socket buffer (skb) headroom before an skb_push operation in the wl1271_tx_work function. The flaw can trigger an skb_under_panic kernel Oops during WiFi transmission, typically when headroom is approximately 16 bytes short (110 bytes needed vs. 94 bytes available). It affects Linux kernel versions from 2.6.32 through multiple stable branches, with fixed versions including 5.10.250, 5.15.200, 6.1.163, 6.6.124, 6.12.70, and 6.18.10. Disclosed on February 14, 2026, it carries a CVSS v3.1 base score of 5.5 (Medium) (Feedly).

The root cause is classified under CWE-787 (Out-of-bounds Write) / buffer management error: the wlcore driver's wl1271_tx_work function calls skb_push without first verifying that the socket buffer has sufficient headroom, leading to a kernel panic when headroom is inadequate. The attack vector is local (AV:L) with low privilege required (PR:L), meaning a local user with minimal permissions can trigger the condition by initiating WiFi transmission operations on an affected wlcore-based interface. No user interaction is required. Patches addressing the issue are available across multiple stable kernel branches via commits at git.kernel.org (Feedly, Kernel Patch).

Successful exploitation results in a kernel panic (skb_under_panic Oops), causing an unexpected system reboot and loss of network connectivity until recovery. The impact is limited to availability — there is no confidentiality or integrity impact. Systems running wlcore WiFi drivers (e.g., TI WL12xx/WL18xx chipsets) are at risk of repeated crashes if the condition is triggered, potentially disrupting services dependent on WiFi connectivity (Feedly).

• Logs: Kernel logs (dmesg or /var/log/kern.log) containing skb_under_panic messages or stack traces referencing wl1271_tx_work or wlcore driver functions.
• System Behavior: Unexpected system reboots or kernel panics coinciding with WiFi transmission activity on systems using wlcore-based WiFi adapters (TI WL12xx/WL18xx).
• Process: Kernel crash dumps (if kdump is configured) showing a call trace through skb_push → wl1271_tx_work in the wlcore module.

Update the Linux kernel to a patched stable version for the applicable branch: 5.10.250+, 5.15.200+, 6.1.163+, 6.6.124+, 6.12.70+, or 6.18.10+. Patches are available via multiple commits at git.kernel.org. As a temporary workaround for systems that cannot be immediately patched, administrators may consider disabling wlcore WiFi functionality and using an alternative network interface if available, while monitoring system logs for skb_under_panic errors (Feedly, Kernel Patch). Debian, Ubuntu, SUSE, and Oracle Linux have all issued kernel security advisories incorporating this fix (Debian LTS, Ubuntu USN-8278-1).

Multiple Linux distributions including Debian, Ubuntu, SUSE, and Oracle Linux have issued security advisories and updated kernel packages addressing CVE-2025-71222. Debian published DSA-6141-1 and DLA-4499-1, Ubuntu issued USN-8278-1, USN-8289-1, USN-8296-1, and follow-up advisories, and SUSE released SUSE-2026-0962-1. No notable independent researcher commentary or significant social media discussion has been identified beyond standard distribution security update channels (Debian LTS, Ubuntu USN-8278-1).