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CVE-2022-49349 (GCVE-0-2022-49349)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:11 – Updated: 2026-08-05 08:54
VLAI
Title
ext4: fix use-after-free in ext4_rename_dir_prepare
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: fix use-after-free in ext4_rename_dir_prepare We got issue as follows: EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue ext4_get_first_dir_block: bh->b_data=0xffff88810bee6000 len=34478 ext4_get_first_dir_block: *parent_de=0xffff88810beee6ae bh->b_data=0xffff88810bee6000 ext4_rename_dir_prepare: [1] parent_de=0xffff88810beee6ae ================================================================== BUG: KASAN: use-after-free in ext4_rename_dir_prepare+0x152/0x220 Read of size 4 at addr ffff88810beee6ae by task rep/1895 CPU: 13 PID: 1895 Comm: rep Not tainted 5.10.0+ #241 Call Trace: dump_stack+0xbe/0xf9 print_address_description.constprop.0+0x1e/0x220 kasan_report.cold+0x37/0x7f ext4_rename_dir_prepare+0x152/0x220 ext4_rename+0xf44/0x1ad0 ext4_rename2+0x11c/0x170 vfs_rename+0xa84/0x1440 do_renameat2+0x683/0x8f0 __x64_sys_renameat+0x53/0x60 do_syscall_64+0x33/0x40 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f45a6fc41c9 RSP: 002b:00007ffc5a470218 EFLAGS: 00000246 ORIG_RAX: 0000000000000108 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f45a6fc41c9 RDX: 0000000000000005 RSI: 0000000020000180 RDI: 0000000000000005 RBP: 00007ffc5a470240 R08: 00007ffc5a470160 R09: 0000000020000080 R10: 00000000200001c0 R11: 0000000000000246 R12: 0000000000400bb0 R13: 00007ffc5a470320 R14: 0000000000000000 R15: 0000000000000000 The buggy address belongs to the page: page:00000000440015ce refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x10beee flags: 0x200000000000000() raw: 0200000000000000 ffffea00043ff4c8 ffffea0004325608 0000000000000000 raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88810beee580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88810beee600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88810beee680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88810beee700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88810beee780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== Disabling lock debugging due to kernel taint ext4_rename_dir_prepare: [2] parent_de->inode=3537895424 ext4_rename_dir_prepare: [3] dir=0xffff888124170140 ext4_rename_dir_prepare: [4] ino=2 ext4_rename_dir_prepare: ent->dir->i_ino=2 parent=-757071872 Reason is first directory entry which 'rec_len' is 34478, then will get illegal parent entry. Now, we do not check directory entry after read directory block in 'ext4_get_first_dir_block'. To solve this issue, check directory entry in 'ext4_get_first_dir_block'. [ Trigger an ext4_error() instead of just warning if the directory is missing a '.' or '..' entry. Also make sure we return an error code if the file system is corrupted. -TYT ]
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-27 18:16 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 32f7f22c0b52e8189fef83986b16dc7abe95f2c4 , < 1a3a15bf6f9963d755270cbdb282863b84839195 (git)
Affected: 32f7f22c0b52e8189fef83986b16dc7abe95f2c4 , < 97f802a652a749422dede32071d29a53cf4bd034 (git)
Affected: 32f7f22c0b52e8189fef83986b16dc7abe95f2c4 , < 10801095224de0d0ab06ae60698680c1f883a3ae (git)
Affected: 32f7f22c0b52e8189fef83986b16dc7abe95f2c4 , < eaecf7ebfd5dd09038a80b14be46b844f54cfc5c (git)
Affected: 32f7f22c0b52e8189fef83986b16dc7abe95f2c4 , < dd887f83ea54aea5b780a84527e23ab95f777fed (git)
Affected: 32f7f22c0b52e8189fef83986b16dc7abe95f2c4 , < 364380c00912bed9b5d99eb485018360b0ecf64f (git)
Affected: 32f7f22c0b52e8189fef83986b16dc7abe95f2c4 , < 0ff38b99fa075ddd246487a28cb9af049f4ceef1 (git)
Affected: 32f7f22c0b52e8189fef83986b16dc7abe95f2c4 , < 4a2bea60cf7ff957b3eda0b17750d483876a02fa (git)
Affected: 32f7f22c0b52e8189fef83986b16dc7abe95f2c4 , < 0be698ecbe4471fcad80e81ec6a05001421041b3 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.8
Unaffected: 0 , < 3.8 (semver)
Unaffected: 4.9.318 , ≤ 4.9.* (semver)
Unaffected: 4.14.283 , ≤ 4.14.* (semver)
Unaffected: 4.19.247 , ≤ 4.19.* (semver)
Unaffected: 5.4.198 , ≤ 5.4.* (semver)
Unaffected: 5.10.121 , ≤ 5.10.* (semver)
Unaffected: 5.15.46 , ≤ 5.15.* (semver)
Unaffected: 5.17.14 , ≤ 5.17.* (semver)
Unaffected: 5.18.3 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix use-after-free in ext4_rename_dir_prepare\n\nWe got issue as follows:\nEXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue\next4_get_first_dir_block: bh-\u003eb_data=0xffff88810bee6000 len=34478\next4_get_first_dir_block: *parent_de=0xffff88810beee6ae bh-\u003eb_data=0xffff88810bee6000\next4_rename_dir_prepare: [1] parent_de=0xffff88810beee6ae\n==================================================================\nBUG: KASAN: use-after-free in ext4_rename_dir_prepare+0x152/0x220\nRead of size 4 at addr ffff88810beee6ae by task rep/1895\n\nCPU: 13 PID: 1895 Comm: rep Not tainted 5.10.0+ #241\nCall Trace:\n dump_stack+0xbe/0xf9\n print_address_description.constprop.0+0x1e/0x220\n kasan_report.cold+0x37/0x7f\n ext4_rename_dir_prepare+0x152/0x220\n ext4_rename+0xf44/0x1ad0\n ext4_rename2+0x11c/0x170\n vfs_rename+0xa84/0x1440\n do_renameat2+0x683/0x8f0\n __x64_sys_renameat+0x53/0x60\n do_syscall_64+0x33/0x40\n entry_SYSCALL_64_after_hwframe+0x44/0xa9\nRIP: 0033:0x7f45a6fc41c9\nRSP: 002b:00007ffc5a470218 EFLAGS: 00000246 ORIG_RAX: 0000000000000108\nRAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f45a6fc41c9\nRDX: 0000000000000005 RSI: 0000000020000180 RDI: 0000000000000005\nRBP: 00007ffc5a470240 R08: 00007ffc5a470160 R09: 0000000020000080\nR10: 00000000200001c0 R11: 0000000000000246 R12: 0000000000400bb0\nR13: 00007ffc5a470320 R14: 0000000000000000 R15: 0000000000000000\n\nThe buggy address belongs to the page:\npage:00000000440015ce refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x10beee\nflags: 0x200000000000000()\nraw: 0200000000000000 ffffea00043ff4c8 ffffea0004325608 0000000000000000\nraw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000\npage dumped because: kasan: bad access detected\n\nMemory state around the buggy address:\n ffff88810beee580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n ffff88810beee600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n\u003effff88810beee680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n                                  ^\n ffff88810beee700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n ffff88810beee780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n==================================================================\nDisabling lock debugging due to kernel taint\next4_rename_dir_prepare: [2] parent_de-\u003einode=3537895424\next4_rename_dir_prepare: [3] dir=0xffff888124170140\next4_rename_dir_prepare: [4] ino=2\next4_rename_dir_prepare: ent-\u003edir-\u003ei_ino=2 parent=-757071872\n\nReason is first directory entry which \u0027rec_len\u0027 is 34478, then will get illegal\nparent entry. Now, we do not check directory entry after read directory block\nin \u0027ext4_get_first_dir_block\u0027.\nTo solve this issue, check directory entry in \u0027ext4_get_first_dir_block\u0027.\n\n[ Trigger an ext4_error() instead of just warning if the directory is\n  missing a \u0027.\u0027 or \u0027..\u0027 entry.   Also make sure we return an error code\n  if the file system is corrupted.  -TYT ]"
        }
      ],
      "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 via the local VFS rename path (renameat \u2192 vfs_rename \u2192 ext4_rename \u2192 ext4_rename_dir_prepare \u2192 ext4_get_first_dir_block) after mounting a crafted ext4 image; there is no network-protocol or packet-processing entry into this path.\nAC:L - A crafted first directory entry with an oversized rec_len (e.g. 34478) deterministically makes ext4_next_entry compute a parent_de past the buffer_head into freed memory; the attacker fully controls on-disk dirents with no race or attacker-uncontrollable layout required.\nPR:N - The attacker needs no privileges on the target\u2014only a malicious ext4 image (USB/SD/loop); ext4 lacks FS_USERNS_MOUNT, so CAP_SYS_ADMIN belongs to the victim or automount path that mounts the volume.\nUI:R - Exploitation requires a user or automount/storage daemon to mount the attacker-supplied ext4 volume and then rename a crafted directory so the corrupt \u0027.\u0027 / \u0027..\u0027 walk runs in ext4_rename_dir_prepare.\nS:U - Impact is host-kernel heap/page UAF within the same OS security authority; this is standard local privilege escalation, not a VM escape, IOMMU bypass, or other cross-boundary scope change.\nC:H - KASAN demonstrates a use-after-free read of parent_de-\u003einode from a freed page; UAF reclaim/heap spray yields arbitrary kernel read primitives, scored Confidentiality High per UAF guidance.\nI:H - If sprayed freed-page contents satisfy the parent inode check, ext4_rename_dir_finish writes through the dangling parent_de pointer (parent_de-\u003einode = dir_ino), yielding a UAF write / control-flow hijack primitive scored Integrity High.\nA:H - The demonstrated KASAN use-after-free in ext4_rename_dir_prepare and subsequent dangling-pointer use can oops/panic the kernel even without full exploitation, so Availability impact is High."
            }
          ]
        }
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        "dateUpdated": "2026-08-05T08:54:51.229Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/1a3a15bf6f9963d755270cbdb282863b84839195"
        },
        {
          "url": "https://git.kernel.org/stable/c/97f802a652a749422dede32071d29a53cf4bd034"
        },
        {
          "url": "https://git.kernel.org/stable/c/10801095224de0d0ab06ae60698680c1f883a3ae"
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        {
          "url": "https://git.kernel.org/stable/c/4a2bea60cf7ff957b3eda0b17750d483876a02fa"
        },
        {
          "url": "https://git.kernel.org/stable/c/0be698ecbe4471fcad80e81ec6a05001421041b3"
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      ],
      "title": "ext4: fix use-after-free in ext4_rename_dir_prepare",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49349",
    "datePublished": "2025-02-26T02:11:02.993Z",
    "dateReserved": "2025-02-26T02:08:31.544Z",
    "dateUpdated": "2026-08-05T08:54:51.229Z",
    "state": "PUBLISHED"
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix use-after-free in ext4_rename_dir_prepare\n\nWe got issue as follows:\nEXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue\next4_get_first_dir_block: bh-\u003eb_data=0xffff88810bee6000 len=34478\next4_get_first_dir_block: *parent_de=0xffff88810beee6ae bh-\u003eb_data=0xffff88810bee6000\next4_rename_dir_prepare: [1] parent_de=0xffff88810beee6ae\n==================================================================\nBUG: KASAN: use-after-free in ext4_rename_dir_prepare+0x152/0x220\nRead of size 4 at addr ffff88810beee6ae by task rep/1895\n\nCPU: 13 PID: 1895 Comm: rep Not tainted 5.10.0+ #241\nCall Trace:\n dump_stack+0xbe/0xf9\n print_address_description.constprop.0+0x1e/0x220\n kasan_report.cold+0x37/0x7f\n ext4_rename_dir_prepare+0x152/0x220\n ext4_rename+0xf44/0x1ad0\n ext4_rename2+0x11c/0x170\n vfs_rename+0xa84/0x1440\n do_renameat2+0x683/0x8f0\n __x64_sys_renameat+0x53/0x60\n do_syscall_64+0x33/0x40\n entry_SYSCALL_64_after_hwframe+0x44/0xa9\nRIP: 0033:0x7f45a6fc41c9\nRSP: 002b:00007ffc5a470218 EFLAGS: 00000246 ORIG_RAX: 0000000000000108\nRAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f45a6fc41c9\nRDX: 0000000000000005 RSI: 0000000020000180 RDI: 0000000000000005\nRBP: 00007ffc5a470240 R08: 00007ffc5a470160 R09: 0000000020000080\nR10: 00000000200001c0 R11: 0000000000000246 R12: 0000000000400bb0\nR13: 00007ffc5a470320 R14: 0000000000000000 R15: 0000000000000000\n\nThe buggy address belongs to the page:\npage:00000000440015ce refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x10beee\nflags: 0x200000000000000()\nraw: 0200000000000000 ffffea00043ff4c8 ffffea0004325608 0000000000000000\nraw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000\npage dumped because: kasan: bad access detected\n\nMemory state around the buggy address:\n ffff88810beee580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n ffff88810beee600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n\u003effff88810beee680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n                                  ^\n ffff88810beee700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n ffff88810beee780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n==================================================================\nDisabling lock debugging due to kernel taint\next4_rename_dir_prepare: [2] parent_de-\u003einode=3537895424\next4_rename_dir_prepare: [3] dir=0xffff888124170140\next4_rename_dir_prepare: [4] ino=2\next4_rename_dir_prepare: ent-\u003edir-\u003ei_ino=2 parent=-757071872\n\nReason is first directory entry which \u0027rec_len\u0027 is 34478, then will get illegal\nparent entry. Now, we do not check directory entry after read directory block\nin \u0027ext4_get_first_dir_block\u0027.\nTo solve this issue, check directory entry in \u0027ext4_get_first_dir_block\u0027.\n\n[ Trigger an ext4_error() instead of just warning if the directory is\n  missing a \u0027.\u0027 or \u0027..\u0027 entry.   Also make sure we return an error code\n  if the file system is corrupted.  -TYT ]"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: se corrige el use-after-free en ext4_rename_dir_prepare Tuvimos el siguiente problema: EXT4-fs (loop0): sistema de archivos montado sin diario. Opciones: ,errores=continuar ext4_get_first_dir_block: bh-\u0026gt;b_data=0xffff88810bee6000 len=34478 ext4_get_first_dir_block: *parent_de=0xffff88810beee6ae bh-\u0026gt;b_data=0xffff88810bee6000 ext4_rename_dir_prepare: [1] parent_de=0xffff88810beee6ae =================================================================== ERROR: KASAN: use-after-free en ext4_rename_dir_prepare+0x152/0x220 Lectura de tama\u00f1o 4 en la direcci\u00f3n ffff88810beee6ae por tarea rep/1895 CPU: 13 PID: 1895 Comm: rep No contaminado 5.10.0+ #241 Seguimiento de llamadas: dump_stack+0xbe/0xf9 print_address_description.constprop.0+0x1e/0x220 kasan_report.cold+0x37/0x7f ext4_rename_dir_prepare+0x152/0x220 ext4_rename+0xf44/0x1ad0 ext4_rename2+0x11c/0x170 vfs_rename+0xa84/0x1440 do_renameat2+0x683/0x8f0 __x64_sys_renameat+0x53/0x60 do_syscall_64+0x33/0x40 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f45a6fc41c9 RSP: 002b:00007ffc5a470218 EFLAGS: 00000246 ORIG_RAX: 0000000000000108 RAX: ffffffffffffffda RBX: 000000000000000 RCX: 00007f45a6fc41c9 RDX: 0000000000000005 RSI: 0000000020000180 RDI: 0000000000000005 RBP: 00007ffc5a470240 R08: 00007ffc5a470160 R09: 0000000020000080 R10: 00000000200001c0 R11: 0000000000000246 R12: 0000000000400bb0 R13: 00007ffc5a470320 R14: 0000000000000000 R15: 0000000000000000 La direcci\u00f3n con errores pertenece a la p\u00e1gina: page:00000000440015ce refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x10beee flags: 0x200000000000000() raw: 0200000000000000 ffffea00043ff4c8 ffffea0004325608 0000000000000000 raw: 000000000000001 000000000000000 00000000ffffffff 000000000000000 p\u00e1gina volcada porque: kasan: mal acceso detectado Estado de la memoria alrededor de la direcci\u00f3n con errores: ffff88810beee580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff88810beee600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff \u0026gt;ffff88810beee680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88810beee700: ff ff ff ff ff ff ff ff ff ff ff ff ffff88810beee780: ff ff ff ff ff ff ff ff ff ff ff ff ff ====================================================================== Desactivar bloqueo depuraci\u00f3n debido a la corrupci\u00f3n del kernel ext4_rename_dir_prepare: [2] parent_de-\u0026gt;inode=3537895424 ext4_rename_dir_prepare: [3] dir=0xffff888124170140 ext4_rename_dir_prepare: [4] ino=2 ext4_rename_dir_prepare: ent-\u0026gt;dir-\u0026gt;i_ino=2 parent=-757071872 El motivo es que la primera entrada del directorio cuyo \u0027rec_len\u0027 es 34478, obtendr\u00e1 una entrada principal ilegal. Ahora, no verificamos la entrada del directorio despu\u00e9s de leer el bloque del directorio en \u0027ext4_get_first_dir_block\u0027. Para resolver este problema, verifique la entrada del directorio en \u0027ext4_get_first_dir_block\u0027. [ Active un ext4_error() en lugar de solo advertir si al directorio le falta una entrada \u0027.\u0027 o \u0027..\u0027. Tambi\u00e9n aseg\u00farese de que devolvamos un c\u00f3digo de error si el sistema de archivos est\u00e1 da\u00f1ado. -\u00a1 ..."
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                  "version": "32f7f22c0b52e8189fef83986b16dc7abe95f2c4",
                  "versionType": "git"
                },
                {
                  "lessThan": "eaecf7ebfd5dd09038a80b14be46b844f54cfc5c",
                  "status": "affected",
                  "version": "32f7f22c0b52e8189fef83986b16dc7abe95f2c4",
                  "versionType": "git"
                },
                {
                  "lessThan": "dd887f83ea54aea5b780a84527e23ab95f777fed",
                  "status": "affected",
                  "version": "32f7f22c0b52e8189fef83986b16dc7abe95f2c4",
                  "versionType": "git"
                },
                {
                  "lessThan": "364380c00912bed9b5d99eb485018360b0ecf64f",
                  "status": "affected",
                  "version": "32f7f22c0b52e8189fef83986b16dc7abe95f2c4",
                  "versionType": "git"
                },
                {
                  "lessThan": "0ff38b99fa075ddd246487a28cb9af049f4ceef1",
                  "status": "affected",
                  "version": "32f7f22c0b52e8189fef83986b16dc7abe95f2c4",
                  "versionType": "git"
                },
                {
                  "lessThan": "4a2bea60cf7ff957b3eda0b17750d483876a02fa",
                  "status": "affected",
                  "version": "32f7f22c0b52e8189fef83986b16dc7abe95f2c4",
                  "versionType": "git"
                },
                {
                  "lessThan": "0be698ecbe4471fcad80e81ec6a05001421041b3",
                  "status": "affected",
                  "version": "32f7f22c0b52e8189fef83986b16dc7abe95f2c4",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "fs/ext4/namei.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "3.8"
                },
                {
                  "lessThan": "3.8",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.9.*",
                  "status": "unaffected",
                  "version": "4.9.318",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.14.*",
                  "status": "unaffected",
                  "version": "4.14.283",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.19.*",
                  "status": "unaffected",
                  "version": "4.19.247",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.4.*",
                  "status": "unaffected",
                  "version": "5.4.198",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.121",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.46",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.17.*",
                  "status": "unaffected",
                  "version": "5.17.14",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.18.*",
                  "status": "unaffected",
                  "version": "5.18.3",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "5.19",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.9.318",
                      "versionStartIncluding": "3.8",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.14.283",
                      "versionStartIncluding": "3.8",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.19.247",
                      "versionStartIncluding": "3.8",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.198",
                      "versionStartIncluding": "3.8",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.121",
                      "versionStartIncluding": "3.8",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.46",
                      "versionStartIncluding": "3.8",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.17.14",
                      "versionStartIncluding": "3.8",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.18.3",
                      "versionStartIncluding": "3.8",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.19",
                      "versionStartIncluding": "3.8",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix use-after-free in ext4_rename_dir_prepare\n\nWe got issue as follows:\nEXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue\next4_get_first_dir_block: bh-\u003eb_data=0xffff88810bee6000 len=34478\next4_get_first_dir_block: *parent_de=0xffff88810beee6ae bh-\u003eb_data=0xffff88810bee6000\next4_rename_dir_prepare: [1] parent_de=0xffff88810beee6ae\n==================================================================\nBUG: KASAN: use-after-free in ext4_rename_dir_prepare+0x152/0x220\nRead of size 4 at addr ffff88810beee6ae by task rep/1895\n\nCPU: 13 PID: 1895 Comm: rep Not tainted 5.10.0+ #241\nCall Trace:\n dump_stack+0xbe/0xf9\n print_address_description.constprop.0+0x1e/0x220\n kasan_report.cold+0x37/0x7f\n ext4_rename_dir_prepare+0x152/0x220\n ext4_rename+0xf44/0x1ad0\n ext4_rename2+0x11c/0x170\n vfs_rename+0xa84/0x1440\n do_renameat2+0x683/0x8f0\n __x64_sys_renameat+0x53/0x60\n do_syscall_64+0x33/0x40\n entry_SYSCALL_64_after_hwframe+0x44/0xa9\nRIP: 0033:0x7f45a6fc41c9\nRSP: 002b:00007ffc5a470218 EFLAGS: 00000246 ORIG_RAX: 0000000000000108\nRAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f45a6fc41c9\nRDX: 0000000000000005 RSI: 0000000020000180 RDI: 0000000000000005\nRBP: 00007ffc5a470240 R08: 00007ffc5a470160 R09: 0000000020000080\nR10: 00000000200001c0 R11: 0000000000000246 R12: 0000000000400bb0\nR13: 00007ffc5a470320 R14: 0000000000000000 R15: 0000000000000000\n\nThe buggy address belongs to the page:\npage:00000000440015ce refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x10beee\nflags: 0x200000000000000()\nraw: 0200000000000000 ffffea00043ff4c8 ffffea0004325608 0000000000000000\nraw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000\npage dumped because: kasan: bad access detected\n\nMemory state around the buggy address:\n ffff88810beee580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n ffff88810beee600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n\u003effff88810beee680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n                                  ^\n ffff88810beee700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n ffff88810beee780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n==================================================================\nDisabling lock debugging due to kernel taint\next4_rename_dir_prepare: [2] parent_de-\u003einode=3537895424\next4_rename_dir_prepare: [3] dir=0xffff888124170140\next4_rename_dir_prepare: [4] ino=2\next4_rename_dir_prepare: ent-\u003edir-\u003ei_ino=2 parent=-757071872\n\nReason is first directory entry which \u0027rec_len\u0027 is 34478, then will get illegal\nparent entry. Now, we do not check directory entry after read directory block\nin \u0027ext4_get_first_dir_block\u0027.\nTo solve this issue, check directory entry in \u0027ext4_get_first_dir_block\u0027.\n\n[ Trigger an ext4_error() instead of just warning if the directory is\n  missing a \u0027.\u0027 or \u0027..\u0027 entry.   Also make sure we return an error code\n  if the file system is corrupted.  -TYT ]"
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-11T18:57:58.831Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/1a3a15bf6f9963d755270cbdb282863b84839195"
            },
            {
              "url": "https://git.kernel.org/stable/c/97f802a652a749422dede32071d29a53cf4bd034"
            },
            {
              "url": "https://git.kernel.org/stable/c/10801095224de0d0ab06ae60698680c1f883a3ae"
            },
            {
              "url": "https://git.kernel.org/stable/c/eaecf7ebfd5dd09038a80b14be46b844f54cfc5c"
            },
            {
              "url": "https://git.kernel.org/stable/c/dd887f83ea54aea5b780a84527e23ab95f777fed"
            },
            {
              "url": "https://git.kernel.org/stable/c/364380c00912bed9b5d99eb485018360b0ecf64f"
            },
            {
              "url": "https://git.kernel.org/stable/c/0ff38b99fa075ddd246487a28cb9af049f4ceef1"
            },
            {
              "url": "https://git.kernel.org/stable/c/4a2bea60cf7ff957b3eda0b17750d483876a02fa"
            },
            {
              "url": "https://git.kernel.org/stable/c/0be698ecbe4471fcad80e81ec6a05001421041b3"
            }
          ],
          "title": "ext4: fix use-after-free in ext4_rename_dir_prepare",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2022-49349",
        "datePublished": "2025-02-26T02:11:02.993Z",
        "dateReserved": "2025-02-26T02:08:31.544Z",
        "dateUpdated": "2026-05-11T18:57:58.831Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.

Sightings

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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.


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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.