CVE-2025-38175 in Linux
Resumen
por MITRE • 2025-07-04
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: binder: corrige otro UAF en binder_devices El commit e77aff5528a18 ("binderfs: corrige uuse-after-free en binder_devices") abordó un use-after-free donde los dispositivos podían liberarse sin eliminarse primero de la lista binder_devices. Sin embargo, hay una ruta similar en binder_free_proc() que se omitió: ====================================================================== ERROR: KASAN: slab-use-after-free in binder_remove_device+0xd4/0x100 Write of size 8 at addr ffff0000c773b900 by task umount/467 CPU: 12 UID: 0 PID: 467 Comm: umount Not tainted 6.15.0-rc7-00138-g57483a362741 #9 PREEMPT Hardware name: linux,dummy-virt (DT) Call trace: binder_remove_device+0xd4/0x100 binderfs_evict_inode+0x230/0x2f0 evict+0x25c/0x5dc iput+0x304/0x480 dentry_unlink_inode+0x208/0x46c __dentry_kill+0x154/0x530 [...] Allocated by task 463: __kmalloc_cache_noprof+0x13c/0x324 binderfs_binder_device_create.isra.0+0x138/0xa60 binder_ctl_ioctl+0x1ac/0x230 [...] Freed by task 215: kfree+0x184/0x31c binder_proc_dec_tmpref+0x33c/0x4ac binder_deferred_func+0xc10/0x1108 process_one_work+0x520/0xba4 [...] ====================================================================== Llame a binder_remove_device() dentro de binder_free_proc() para asegurarse de que el dispositivo se elimine de la lista binder_devices antes de ser liberado.
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