{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.180-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.95-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.3-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "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 = \u0026empty_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.",
  "id": "DEBIAN-CVE-2026-63810",
  "modified": "2026-09-09T08:47:24.671173171Z",
  "published": "2026-07-19T12:16:53.910Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-63810"
    }
  ],
  "upstream": [
    "CVE-2026-63810"
  ]
}