{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-40235",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-40235"
  ],
  "published": "2025-12-04T15:33:57Z",
  "summary": "btrfs: directly free partially initialized fs_info in btrfs_check_leaked_roots()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: directly free partially initialized fs_info in btrfs_check_leaked_roots()\n\nIf fs_info->super_copy or fs_info->super_for_commit allocated failed in\nbtrfs_get_tree_subvol(), then no need to call btrfs_free_fs_info().\nOtherwise btrfs_check_leaked_roots() would access NULL pointer because\nfs_info->allocated_roots had not been initialised.\n\nsyzkaller reported the following information:\n  ------------[ cut here ]------------\n  BUG: unable to handle page fault for address: fffffffffffffbb0\n  #PF: supervisor read access in kernel mode\n  #PF: error_code(0x0000) - not-present page\n  PGD 64c9067 P4D 64c9067 PUD 64cb067 PMD 0\n  Oops: Oops: 0000 [#1] SMP KASAN PTI\n  CPU: 0 UID: 0 PID: 1402 Comm: syz.1.35 Not tainted 6.15.8 #4 PREEMPT(lazy)\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), (...)\n  RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]\n  RIP: 0010:raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]\n  RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline]\n  RIP: 0010:refcount_read include/linux/refcount.h:170 [inline]\n  RIP: 0010:btrfs_check_leaked_roots+0x18f/0x2c0 fs/btrfs/disk-io.c:1230\n  [...]\n  Call Trace:\n   <TASK>\n   btrfs_free_fs_info+0x310/0x410 fs/btrfs/disk-io.c:1280\n   btrfs_get_tree_subvol+0x592/0x6b0 fs/btrfs/super.c:2029\n   btrfs_get_tree+0x63/0x80 fs/btrfs/super.c:2097\n   vfs_get_tree+0x98/0x320 fs/super.c:1759\n   do_new_mount+0x357/0x660 fs/namespace.c:3899\n   path_mount+0x716/0x19c0 fs/namespace.c:4226\n   do_mount fs/namespace.c:4239 [inline]\n   __do_sys_mount fs/namespace.c:4450 [inline]\n   __se_sys_mount fs/namespace.c:4427 [inline]\n   __x64_sys_mount+0x28c/0x310 fs/namespace.c:4427\n   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n   do_syscall_64+0x92/0x180 arch/x86/entry/syscall_64.c:94\n   entry_SYSCALL_64_after_hwframe+0x76/0x7e\n  RIP: 0033:0x7f032eaffa8d\n  [...]",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.12.20-1+rpt1~bpo12+1",
        "1:6.12.25-1+rpt1",
        "1:6.12.34-1+rpt1~bookworm",
        "1:6.12.47-1+rpt1~bookworm"
      ],
      "ecosystem_specific": {
        "binaries": [
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            "binary_version": "1:6.12.20-1+rpt1~bpo12+1"
          },
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            "binary_version": "1:6.12.20-1+rpt1~bpo12+1"
          },
          {
            "binary_name": "linux-image-6.12.20+rpt-rpi-v7",
            "binary_version": "1:6.12.20-1+rpt1~bpo12+1"
          },
          {
            "binary_name": "linux-image-6.12.20+rpt-rpi-v7l",
            "binary_version": "1:6.12.20-1+rpt1~bpo12+1"
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            "binary_version": "1:6.12.25-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.25+rpt-rpi-v6",
            "binary_version": "1:6.12.25-1+rpt1"
          },
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            "binary_version": "1:6.12.25-1+rpt1"
          },
          {
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            "binary_version": "1:6.12.25-1+rpt1"
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            "binary_version": "1:6.12.47-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.47+rpt-rpi-v6",
            "binary_version": "1:6.12.47-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.47+rpt-rpi-v7",
            "binary_version": "1:6.12.47-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.47+rpt-rpi-v7l",
            "binary_version": "1:6.12.47-1+rpt1~bookworm"
          },
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            "binary_name": "linux-image-6.12.47+rpt-rpi-v8",
            "binary_version": "1:6.12.47-1+rpt1~bookworm"
          },
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      },
      "database_specific": {
        "per_version": {
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            "linux_commit": "cd231d4775b14f228606c09f219b48308f6ab3aa",
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.56"
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            "linux_commit": "3dd2c2c507c271d411fab2e82a2b3b7e0b6d3f16",
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.56"
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            "assessment": "commit ancestry (strak rule)",
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            "assessment": "commit ancestry (strak rule)",
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          }
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      }
    },
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:13",
        "name": "linux"
      },
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        "1:6.12.19-1+rpt1",
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            "binary_version": "1:6.12.19-1+rpt1"
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            "binary_version": "1:6.12.19-1+rpt1"
          },
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            "binary_name": "linux-image-6.12.19+rpt-rpi-v7l",
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            "assessment": "commit ancestry (strak rule)",
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          },
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          },
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          }
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    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-40235"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b1c2b4e6ffd307720ab6ce42f6749b0c02ba0a73"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0c2b2d4d053e9840e6da6ed581befa20309f281a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/17679ac6df6c4830ba711835aa8cf961be36cfa1"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}