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CVE-2022-49763 (GCVE-0-2022-49763)

Vulnerability from cvelistv5 – Published: 2025-05-01 14:09 – Updated: 2026-08-05 08:56
VLAI
Title
ntfs: fix use-after-free in ntfs_attr_find()
Summary
In the Linux kernel, the following vulnerability has been resolved: ntfs: fix use-after-free in ntfs_attr_find() Patch series "ntfs: fix bugs about Attribute", v2. This patchset fixes three bugs relative to Attribute in record: Patch 1 adds a sanity check to ensure that, attrs_offset field in first mft record loading from disk is within bounds. Patch 2 moves the ATTR_RECORD's bounds checking earlier, to avoid dereferencing ATTR_RECORD before checking this ATTR_RECORD is within bounds. Patch 3 adds an overflow checking to avoid possible forever loop in ntfs_attr_find(). Without patch 1 and patch 2, the kernel triggersa KASAN use-after-free detection as reported by Syzkaller. Although one of patch 1 or patch 2 can fix this, we still need both of them. Because patch 1 fixes the root cause, and patch 2 not only fixes the direct cause, but also fixes the potential out-of-bounds bug. This patch (of 3): Syzkaller reported use-after-free read as follows: ================================================================== BUG: KASAN: use-after-free in ntfs_attr_find+0xc02/0xce0 fs/ntfs/attrib.c:597 Read of size 2 at addr ffff88807e352009 by task syz-executor153/3607 [...] Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x719 mm/kasan/report.c:433 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495 ntfs_attr_find+0xc02/0xce0 fs/ntfs/attrib.c:597 ntfs_attr_lookup+0x1056/0x2070 fs/ntfs/attrib.c:1193 ntfs_read_inode_mount+0x89a/0x2580 fs/ntfs/inode.c:1845 ntfs_fill_super+0x1799/0x9320 fs/ntfs/super.c:2854 mount_bdev+0x34d/0x410 fs/super.c:1400 legacy_get_tree+0x105/0x220 fs/fs_context.c:610 vfs_get_tree+0x89/0x2f0 fs/super.c:1530 do_new_mount fs/namespace.c:3040 [inline] path_mount+0x1326/0x1e20 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd [...] </TASK> The buggy address belongs to the physical page: page:ffffea0001f8d400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e350 head:ffffea0001f8d400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888011842140 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88807e351f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807e351f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807e352000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807e352080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807e352100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Kernel will loads $MFT/$DATA's first mft record in ntfs_read_inode_mount(). Yet the problem is that after loading, kernel doesn't check whether attrs_offset field is a valid value. To be more specific, if attrs_offset field is larger than bytes_allocated field, then it may trigger the out-of-bounds read bug(reported as use-after-free bug) in ntfs_attr_find(), when kernel tries to access the corresponding mft record's attribute. This patch solves it by adding the sanity check between attrs_offset field and bytes_allocated field, after loading the first mft record.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 79f3ac7dcd12c05b7539239a4c6fa229a50d786c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < fb2004bafd1932e08d21ca604ee5844f2b7f212d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d0006d739738a658a9c29b438444259d9f71dfa0 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 266bd5306286316758e6246ea0345133427b0f62 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b825bfbbaafbe8da2037e3a778ad660c59f9e054 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5330c423b86263ac7883fef0260b9e2229cb531e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4863f815463034f588a035cfd99cdca97a4f1069 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d85a1bec8e8d552ab13163ca1874dcd82f3d1550 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 4.9.334 , ≤ 4.9.* (semver)
Unaffected: 4.14.300 , ≤ 4.14.* (semver)
Unaffected: 4.19.267 , ≤ 4.19.* (semver)
Unaffected: 5.4.225 , ≤ 5.4.* (semver)
Unaffected: 5.10.156 , ≤ 5.10.* (semver)
Unaffected: 5.15.80 , ≤ 5.15.* (semver)
Unaffected: 6.0.10 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: fix use-after-free in ntfs_attr_find()\n\nPatch series \"ntfs: fix bugs about Attribute\", v2.\n\nThis patchset fixes three bugs relative to Attribute in record:\n\nPatch 1 adds a sanity check to ensure that, attrs_offset field in first\nmft record loading from disk is within bounds.\n\nPatch 2 moves the ATTR_RECORD\u0027s bounds checking earlier, to avoid\ndereferencing ATTR_RECORD before checking this ATTR_RECORD is within\nbounds.\n\nPatch 3 adds an overflow checking to avoid possible forever loop in\nntfs_attr_find().\n\nWithout patch 1 and patch 2, the kernel triggersa KASAN use-after-free\ndetection as reported by Syzkaller.\n\nAlthough one of patch 1 or patch 2 can fix this, we still need both of\nthem.  Because patch 1 fixes the root cause, and patch 2 not only fixes\nthe direct cause, but also fixes the potential out-of-bounds bug.\n\n\nThis patch (of 3):\n\nSyzkaller reported use-after-free read as follows:\n==================================================================\nBUG: KASAN: use-after-free in ntfs_attr_find+0xc02/0xce0 fs/ntfs/attrib.c:597\nRead of size 2 at addr ffff88807e352009 by task syz-executor153/3607\n\n[...]\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\n print_address_description mm/kasan/report.c:317 [inline]\n print_report.cold+0x2ba/0x719 mm/kasan/report.c:433\n kasan_report+0xb1/0x1e0 mm/kasan/report.c:495\n ntfs_attr_find+0xc02/0xce0 fs/ntfs/attrib.c:597\n ntfs_attr_lookup+0x1056/0x2070 fs/ntfs/attrib.c:1193\n ntfs_read_inode_mount+0x89a/0x2580 fs/ntfs/inode.c:1845\n ntfs_fill_super+0x1799/0x9320 fs/ntfs/super.c:2854\n mount_bdev+0x34d/0x410 fs/super.c:1400\n legacy_get_tree+0x105/0x220 fs/fs_context.c:610\n vfs_get_tree+0x89/0x2f0 fs/super.c:1530\n do_new_mount fs/namespace.c:3040 [inline]\n path_mount+0x1326/0x1e20 fs/namespace.c:3370\n do_mount fs/namespace.c:3383 [inline]\n __do_sys_mount fs/namespace.c:3591 [inline]\n __se_sys_mount fs/namespace.c:3568 [inline]\n __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n [...]\n \u003c/TASK\u003e\n\nThe buggy address belongs to the physical page:\npage:ffffea0001f8d400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e350\nhead:ffffea0001f8d400 order:3 compound_mapcount:0 compound_pincount:0\nflags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)\nraw: 00fff00000010200 0000000000000000 dead000000000122 ffff888011842140\nraw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000\npage dumped because: kasan: bad access detected\nMemory state around the buggy address:\n ffff88807e351f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n ffff88807e351f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n\u003effff88807e352000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n                      ^\n ffff88807e352080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n ffff88807e352100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n==================================================================\n\nKernel will loads $MFT/$DATA\u0027s first mft record in\nntfs_read_inode_mount().\n\nYet the problem is that after loading, kernel doesn\u0027t check whether\nattrs_offset field is a valid value.\n\nTo be more specific, if attrs_offset field is larger than bytes_allocated\nfield, then it may trigger the out-of-bounds read bug(reported as\nuse-after-free bug) in ntfs_attr_find(), when kernel tries to access the\ncorresponding mft record\u0027s attribute.\n\nThis patch solves it by adding the sanity check between attrs_offset field\nand bytes_allocated field, after loading the first mft record."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached only by presenting a crafted NTFS volume to in-kernel fs/ntfs so mount runs ntfs_fill_super\u2192ntfs_read_inode_mount\u2192ntfs_attr_lookup\u2192ntfs_attr_fin d; this is a local block-device, loop, or USB/image path with no network protocol handler.\nAC:L - The attacker fully controls the on-disk $MFT record attrs_offset field, so setting it past bytes_allocated deterministically drives ntfs_attr_find into out-of-bounds/UAF reads with no race or other condition outside attacker control.\nPR:N - The attacker needs no account on the target\u2014the payload is solely a malicious NTFS image (USB stick, disk image, or media handed to udisks2/automount on desktops, kiosks, Android, or automotive systems), matching the established crafted-filesystem model.\nUI:R - Someone must mount the volume or insert media into a system that automounts it; classic ntfs is FS_REQUIRES_DEV without FS_USERNS_MOUNT, so an unprivileged userns cannot mount it alone, and the PoC stack is in the mount task.\nS:U - The use-after-free/out-of-bounds accesses occur in host kernel memory within the same security authority as the mounting kernel; there is no VM escape, IOMMU bypass, or other cross-boundary scope change.\nC:H - KASAN documents a use-after-free read in ntfs_attr_find when attrs_offset points past the allocated MFT buffer into freed/adjacent slab, and per UAF/OOB-read guidance this enables arbitrary kernel memory disclosure via heap reuse.\nI:H - The same OOB ATTR_RECORD pointer is consumed by mount paths (attribute-list size/allocation, memcpy, mapping-pairs decompress, runlist setup), and UAF/memory-corruption of that parse state is treated as enabling heap write and control-flow hijack primitives.\nA:H - The demonstrated KASAN use-after-free fault in ntfs_attr_find during mount can oops/panic the kernel, fully denying availability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:56:15.536Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/79f3ac7dcd12c05b7539239a4c6fa229a50d786c"
        },
        {
          "url": "https://git.kernel.org/stable/c/fb2004bafd1932e08d21ca604ee5844f2b7f212d"
        },
        {
          "url": "https://git.kernel.org/stable/c/d0006d739738a658a9c29b438444259d9f71dfa0"
        },
        {
          "url": "https://git.kernel.org/stable/c/266bd5306286316758e6246ea0345133427b0f62"
        },
        {
          "url": "https://git.kernel.org/stable/c/b825bfbbaafbe8da2037e3a778ad660c59f9e054"
        },
        {
          "url": "https://git.kernel.org/stable/c/5330c423b86263ac7883fef0260b9e2229cb531e"
        },
        {
          "url": "https://git.kernel.org/stable/c/4863f815463034f588a035cfd99cdca97a4f1069"
        },
        {
          "url": "https://git.kernel.org/stable/c/d85a1bec8e8d552ab13163ca1874dcd82f3d1550"
        }
      ],
      "title": "ntfs: fix use-after-free in ntfs_attr_find()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49763",
    "datePublished": "2025-05-01T14:09:03.607Z",
    "dateReserved": "2025-04-16T07:17:33.804Z",
    "dateUpdated": "2026-08-05T08:56:15.536Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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                    "versionType": "semver"
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                    "version": "5.4.225",
                    "versionType": "semver"
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                    "status": "unaffected",
                    "version": "5.10.156",
                    "versionType": "semver"
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                  {
                    "lessThanOrEqual": "5.15.*",
                    "status": "unaffected",
                    "version": "5.15.80",
                    "versionType": "semver"
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                  {
                    "lessThanOrEqual": "6.0.*",
                    "status": "unaffected",
                    "version": "6.0.10",
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                    "version": "6.1",
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                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: fix use-after-free in ntfs_attr_find()\n\nPatch series \"ntfs: fix bugs about Attribute\", v2.\n\nThis patchset fixes three bugs relative to Attribute in record:\n\nPatch 1 adds a sanity check to ensure that, attrs_offset field in first\nmft record loading from disk is within bounds.\n\nPatch 2 moves the ATTR_RECORD\u0027s bounds checking earlier, to avoid\ndereferencing ATTR_RECORD before checking this ATTR_RECORD is within\nbounds.\n\nPatch 3 adds an overflow checking to avoid possible forever loop in\nntfs_attr_find().\n\nWithout patch 1 and patch 2, the kernel triggersa KASAN use-after-free\ndetection as reported by Syzkaller.\n\nAlthough one of patch 1 or patch 2 can fix this, we still need both of\nthem.  Because patch 1 fixes the root cause, and patch 2 not only fixes\nthe direct cause, but also fixes the potential out-of-bounds bug.\n\n\nThis patch (of 3):\n\nSyzkaller reported use-after-free read as follows:\n==================================================================\nBUG: KASAN: use-after-free in ntfs_attr_find+0xc02/0xce0 fs/ntfs/attrib.c:597\nRead of size 2 at addr ffff88807e352009 by task syz-executor153/3607\n\n[...]\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\n print_address_description mm/kasan/report.c:317 [inline]\n print_report.cold+0x2ba/0x719 mm/kasan/report.c:433\n kasan_report+0xb1/0x1e0 mm/kasan/report.c:495\n ntfs_attr_find+0xc02/0xce0 fs/ntfs/attrib.c:597\n ntfs_attr_lookup+0x1056/0x2070 fs/ntfs/attrib.c:1193\n ntfs_read_inode_mount+0x89a/0x2580 fs/ntfs/inode.c:1845\n ntfs_fill_super+0x1799/0x9320 fs/ntfs/super.c:2854\n mount_bdev+0x34d/0x410 fs/super.c:1400\n legacy_get_tree+0x105/0x220 fs/fs_context.c:610\n vfs_get_tree+0x89/0x2f0 fs/super.c:1530\n do_new_mount fs/namespace.c:3040 [inline]\n path_mount+0x1326/0x1e20 fs/namespace.c:3370\n do_mount fs/namespace.c:3383 [inline]\n __do_sys_mount fs/namespace.c:3591 [inline]\n __se_sys_mount fs/namespace.c:3568 [inline]\n __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n [...]\n \u003c/TASK\u003e\n\nThe buggy address belongs to the physical page:\npage:ffffea0001f8d400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e350\nhead:ffffea0001f8d400 order:3 compound_mapcount:0 compound_pincount:0\nflags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)\nraw: 00fff00000010200 0000000000000000 dead000000000122 ffff888011842140\nraw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000\npage dumped because: kasan: bad access detected\nMemory state around the buggy address:\n ffff88807e351f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n ffff88807e351f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n\u003effff88807e352000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n                      ^\n ffff88807e352080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n ffff88807e352100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n==================================================================\n\nKernel will loads $MFT/$DATA\u0027s first mft record in\nntfs_read_inode_mount().\n\nYet the problem is that after loading, kernel doesn\u0027t check whether\nattrs_offset field is a valid value.\n\nTo be more specific, if attrs_offset field is larger than bytes_allocated\nfield, then it may trigger the out-of-bounds read bug(reported as\nuse-after-free bug) in ntfs_attr_find(), when kernel tries to access the\ncorresponding mft record\u0027s attribute.\n\nThis patch solves it by adding the sanity check between attrs_offset field\nand bytes_allocated field, after loading the first mft record."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ntfs: correcci\u00f3n del use-after-free en ntfs_attr_find(). Serie de parches \"ntfs: correcci\u00f3n de errores sobre el atributo\", v2. Este conjunto de parches corrige tres errores relacionados con el atributo en el registro: el parche 1 a\u00f1ade una comprobaci\u00f3n de seguridad para garantizar que el campo attrs_offset en la primera carga de registro MFT desde el disco est\u00e9 dentro de los l\u00edmites. El parche 2 adelanta la comprobaci\u00f3n de los l\u00edmites de ATTR_RECORD para evitar desreferenciarlo antes de comprobar que est\u00e9 dentro de los l\u00edmites. El parche 3 a\u00f1ade una comprobaci\u00f3n de desbordamiento para evitar un posible bucle infinito en ntfs_attr_find(). Sin los parches 1 y 2, el kernel activa la detecci\u00f3n de use-after-free de KASAN, seg\u00fan lo informado por Syzkaller. Aunque uno de los parches 1 o 2 puede solucionar esto, a\u00fan necesitamos ambos. Porque el parche 1 corrige la causa ra\u00edz, y el parche 2 no solo corrige la causa directa, sino que tambi\u00e9n corrige el posible error fuera de los l\u00edmites. Este parche (de 3): Syzkaller inform\u00f3 una lectura de use-after-free de la siguiente manera: ====================================================================== ERROR: KASAN: use-after-free en ntfs_attr_find+0xc02/0xce0 fs/ntfs/attrib.c:597 Lectura de tama\u00f1o 2 en la direcci\u00f3n ffff88807e352009 por la tarea syz-executor153/3607 [...] Rastreo de llamadas:  __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x719 mm/kasan/report.c:433 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495 ntfs_attr_find+0xc02/0xce0 fs/ntfs/attrib.c:597 ntfs_attr_lookup+0x1056/0x2070 fs/ntfs/attrib.c:1193 ntfs_read_inode_mount+0x89a/0x2580 fs/ntfs/inode.c:1845 ntfs_fill_super+0x1799/0x9320 fs/ntfs/super.c:2854 mount_bdev+0x34d/0x410 fs/super.c:1400 legacy_get_tree+0x105/0x220 fs/fs_context.c:610 vfs_get_tree+0x89/0x2f0 fs/super.c:1530 do_new_mount fs/namespace.c:3040 [inline] path_mount+0x1326/0x1e20 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd [...]  La direcci\u00f3n con errores pertenece a la p\u00e1gina f\u00edsica: page:ffffea0001f8d400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e350 head:ffffea0001f8d400 order:3 Compound_mapcount:0 Compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 muerto000000000122 ffff888011842140 raw: 00000000000000000 0000000000040004 00000001ffffffff 0000000000000000 p\u00e1gina volcada porque: kasan: mal acceso detectado Estado de la memoria alrededor de la direcci\u00f3n con errores: ffff88807e351f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807e351f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc \u0026gt;ffff88807e352000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807e352080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807e352100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ====================================================================== El n\u00facleo cargar\u00e1 el primer registro mft de $MFT/$DATA en ntfs_read_inode_mount(). Sin embargo, el problema radica en que, tras la carga, el kernel no comprueba si el campo attrs_offset es un valor v\u00e1lido. M\u00e1s espec\u00edficamente, si el campo attrs_offset es mayor que el campo bytes_allocated, podr\u00eda activarse el error de lectura fuera de los l\u00edmites (reportado como error de use-after-free) en ntfs_attr_find() cuando el kernel intenta acceder al atributo del registro MFT correspondiente. Este parche lo soluciona a\u00f1adiendo la comprobaci\u00f3n de validez entre los campos attrs_offset y bytes_allocated tras cargar el primer registro MFT."
          }
        ],
        "id": "CVE-2022-49763",
        "lastModified": "2026-08-04T10:17:55.720",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            },
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2025-05-01T15:15:59.047",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
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            "url": "https://git.kernel.org/stable/c/266bd5306286316758e6246ea0345133427b0f62"
          },
          {
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            "tags": [
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          },
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          },
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            "url": "https://git.kernel.org/stable/c/79f3ac7dcd12c05b7539239a4c6fa229a50d786c"
          },
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          },
          {
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            "url": "https://git.kernel.org/stable/c/d0006d739738a658a9c29b438444259d9f71dfa0"
          },
          {
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            "tags": [
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          },
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            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/fb2004bafd1932e08d21ca604ee5844f2b7f212d"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-416"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:41:20+00:00",
      "cve": "CVE-2022-49763",
      "id": "CVE-2022-49763",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ntfs: fix use-after-free in ntfs_attr_find()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49763.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-05T00:55:45Z",
      "cve": "CVE-2022-49763",
      "id": "CVE-2022-49763",
      "initial_release_date": "2025-05-05T13:35:14Z",
      "product_status:known_affected": "369",
      "product_status:known_not_affected": "441",
      "product_status:recommended": "92",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49763",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49763.json",
      "version": "31"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.