CVE-2026-63810

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> block: Avoid mounting the bdev pseudo-filesystem in userspace<br /> <br /> The bdev pseudo-filesystem is an internal kernel filesystem with which<br /> userspace should not interfere. Unregister it so that userspace cannot<br /> even attempt to mount it.<br /> <br /> This fixes a bug [1] that occurs when attempting to access files,<br /> because the system call move_mount() uses pointers declared in the<br /> inode_operations structure, which for the bdev pseudo-filesystem<br /> are always equal to 0. `inode-&gt;i_op = &amp;empty_iops;`<br /> <br /> [1]<br /> <br /> BUG: kernel NULL pointer dereference, address: 0000000000000000<br /> #PF: supervisor instruction fetch in kernel mode<br /> #PF: error_code(0x0010) - not-present page<br /> PGD 23380067 P4D 23380067 PUD 23381067 PMD 0<br /> Oops: 0010 [#1] PREEMPT SMP KASAN NOPTI<br /> CPU: 2 PID: 17125 Comm: syz-executor.0 Not tainted 6.1.155-syzkaller-00350-g84221fde2681 #0<br /> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014<br /> RIP: 0010:0x0<br /> <br /> Call Trace:<br /> <br /> lookup_open.isra.0+0x700/0x1180 fs/namei.c:3460<br /> open_last_lookups fs/namei.c:3550 [inline]<br /> path_openat+0x953/0x2700 fs/namei.c:3780<br /> do_filp_open+0x1c5/0x410 fs/namei.c:3810<br /> do_sys_openat2+0x171/0x4d0 fs/open.c:1318<br /> do_sys_open fs/open.c:1334 [inline]<br /> __do_sys_openat fs/open.c:1350 [inline]<br /> __se_sys_openat fs/open.c:1345 [inline]<br /> __x64_sys_openat+0x13c/0x1f0 fs/open.c:1345<br /> do_syscall_x64 arch/x86/entry/common.c:51 [inline]<br /> do_syscall_64+0x35/0x80 arch/x86/entry/common.c:81<br /> entry_SYSCALL_64_after_hwframe+0x6e/0xd8<br /> <br /> Found by Linux Verification Center (linuxtesting.org) with Syzkaller.