{"id":"DEBIAN-CVE-2026-63810","details":"In the Linux kernel, the following vulnerability has been resolved:  block: Avoid mounting the bdev pseudo-filesystem in userspace  The bdev pseudo-filesystem is an internal kernel filesystem with which userspace should not interfere. Unregister it so that userspace cannot even attempt to mount it.  This fixes a bug [1] that occurs when attempting to access files, because the system call move_mount() uses pointers declared in the inode_operations structure, which for the bdev pseudo-filesystem are always equal to 0. `inode-\u003ei_op = &empty_iops;`  [1]   BUG: kernel NULL pointer dereference, address: 0000000000000000  #PF: supervisor instruction fetch in kernel mode  #PF: error_code(0x0010) - not-present page  PGD 23380067 P4D 23380067 PUD 23381067 PMD 0  Oops: 0010 [#1] PREEMPT SMP KASAN NOPTI  CPU: 2 PID: 17125 Comm: syz-executor.0 Not tainted 6.1.155-syzkaller-00350-g84221fde2681 #0  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014  RIP: 0010:0x0   Call Trace:  \u003cTASK\u003e  lookup_open.isra.0+0x700/0x1180 fs/namei.c:3460  open_last_lookups fs/namei.c:3550 [inline]  path_openat+0x953/0x2700 fs/namei.c:3780  do_filp_open+0x1c5/0x410 fs/namei.c:3810  do_sys_openat2+0x171/0x4d0 fs/open.c:1318  do_sys_open fs/open.c:1334 [inline]  __do_sys_openat fs/open.c:1350 [inline]  __se_sys_openat fs/open.c:1345 [inline]  __x64_sys_openat+0x13c/0x1f0 fs/open.c:1345  do_syscall_x64 arch/x86/entry/common.c:51 [inline]  do_syscall_64+0x35/0x80 arch/x86/entry/common.c:81  entry_SYSCALL_64_after_hwframe+0x6e/0xd8  Found by Linux Verification Center (linuxtesting.org) with Syzkaller.","modified":"2026-09-29T12:47:48.900618213Z","published":"2026-07-19T12:16:53.910Z","upstream":["CVE-2026-63810"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-63810"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.180-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","6.1.164-1","6.1.170-1","6.1.170-2","6.1.170-3","6.1.172-1","6.1.174-1","6.1.176-1","6.1.177-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-63810.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.95-1"}]}],"versions":["6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1","6.12.69-1~bpo12+1","6.12.73-1","6.12.73-1~bpo12+1","6.12.74-1","6.12.74-2","6.12.74-2~bpo12+1","6.12.85-1","6.12.85-1~bpo12+1","6.12.86-1","6.12.86-1~bpo12+1","6.12.88-1","6.12.88-1~bpo12+1","6.12.90-1","6.12.90-1~bpo12+1","6.12.90-2","6.12.90-2~bpo12+1","6.12.94-1","6.12.94-1~bpo12+1","6.12.95-1~bpo12+1"],"ecosystem_specific":{"urgency":"not yet 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