CVE-2024-26686

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fs/proc: do_task_stat: use sig->stats_lock para recopilar las estadísticas de subprocesos/hijos lock_task_sighand() puede desencadenar un bloqueo completo. Si los subprocesos NR_CPUS llaman a do_task_stat() al mismo tiempo y el proceso tiene NR_THREADS, girará con irqs deshabilitados O(NR_CPUS * NR_THREADS) tiempo. Cambie do_task_stat() para usar sig->stats_lock para recopilar las estadísticas fuera de ->sección protegida siglock, en el caso probable de que este código se ejecute sin bloqueo.

A vulnerability was found in the do_task_stat() function in the Linux kernel, where due to excessive lock contention, a potential hard lockup could be created. This can create a performance bottleneck and lead to kernel unresponsiveness.

In the Linux kernel, the following vulnerability has been resolved: fs/proc: do_task_stat: use sig->stats_lock to gather the threads/children stats lock_task_sighand() can trigger a hard lockup. If NR_CPUS threads call do_task_stat() at the same time and the process has NR_THREADS, it will spin with irqs disabled O(NR_CPUS * NR_THREADS) time. Change do_task_stat() to use sig->stats_lock to gather the statistics outside of ->siglock protected section, in the likely case this code will run lockless.

Michael Randrianantenaina discovered that the Bluetooth driver in the Linux Kernel contained an improper access control vulnerability. A nearby attacker could use this to connect a rogue device and possibly execute arbitrary code. It was discovered that the CIFS network file system implementation in the Linux kernel did not properly verify the target namespace when handling upcalls. An attacker could use this to expose sensitive information.