CVE-2024-26606: 
Linux Debian vulnerability analysis and mitigation

CVE-2024-26606 affects the Linux kernel's binder functionality. The vulnerability was discovered and disclosed on February 26, 2024, impacting Linux kernel versions from 2.6.29 up to versions before 4.19.307, 5.4.269, 5.10.210, and 5.15.149. The issue involves a synchronization problem in the binder driver's handling of epoll threads (NVD).

The vulnerability occurs in the binder driver when threads operating in (e)poll mode initiate commands via BINDER_WRITE_READ without a read buffer and then use epoll_wait() to consume responses. The core issue is that epoll threads are not properly signaled via wakeup when they queue their own work, which can lead to threads waiting indefinitely for events, leaving their work unhandled. Additionally, subsequent commands won't trigger a wakeup as the thread has pending work (Kernel Patch). The vulnerability has been assigned a CVSS v3.1 base score of 5.5 (Medium) with vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (NVD).

The vulnerability can result in a denial of service condition where affected threads may become indefinitely blocked, unable to process their work queue. This can lead to system resource exhaustion and degraded performance of applications using the Android binder IPC mechanism (NVD).

The vulnerability has been fixed in the Linux kernel through a patch that adds explicit wakeup signaling for epoll threads when they queue their own work. The fix has been backported to multiple stable kernel versions. Various Linux distributions have released updated kernel packages including Ubuntu, which has fixed versions for 22.04 LTS (5.15.0-106.116), 20.04 LTS (5.4.0-181.201), and other supported releases (Ubuntu).