CVE-2022-50273

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

f2fs: fix to do sanity check on destination blkaddr during recovery

As Wenqing Liu reported in bugzilla:

https://bugzilla.kernel.org/show_bug.cgi?id=216456

If we enable CONFIG_F2FS_CHECK_FS config, it will trigger a kernel panic instead of warning.

The root cause is: in fuzzed image, SIT table is inconsistent with inode mapping table, result in triggering such warning during SIT table update.

This patch introduces a new flag DATA_GENERIC_ENHANCE_UPDATE, w/ this flag, data block recovery flow can check destination blkaddr's validation in SIT table, and skip f2fs_replace_block() to avoid inconsistent status.

Detalles técnicos trazas, registros y código del informe original

loop5: detected capacity change from 0 to 131072
F2FS-fs (loop5): recover_inode: ino = 6, name = hln, inline = 1
F2FS-fs (loop5): recover_data: ino = 6 (i_size: recover) err = 0
F2FS-fs (loop5): recover_inode: ino = 6, name = hln, inline = 1
F2FS-fs (loop5): recover_data: ino = 6 (i_size: recover) err = 0
F2FS-fs (loop5): recover_inode: ino = 6, name = hln, inline = 1
F2FS-fs (loop5): recover_data: ino = 6 (i_size: recover) err = 0
F2FS-fs (loop5): Bitmap was wrongly set, blk:5634
------------[ cut here ]------------
WARNING: CPU: 3 PID: 1013 at fs/f2fs/segment.c:2198
RIP: 0010:update_sit_entry+0xa55/0x10b0 [f2fs]
Call Trace:
 <TASK>
 f2fs_do_replace_block+0xa98/0x1890 [f2fs]
 f2fs_replace_block+0xeb/0x180 [f2fs]
 recover_data+0x1a69/0x6ae0 [f2fs]
 f2fs_recover_fsync_data+0x120d/0x1fc0 [f2fs]
 f2fs_fill_super+0x4665/0x61e0 [f2fs]
 mount_bdev+0x2cf/0x3b0
 legacy_get_tree+0xed/0x1d0
 vfs_get_tree+0x81/0x2b0
 path_mount+0x47e/0x19d0
 do_mount+0xce/0xf0
 __x64_sys_mount+0x12c/0x1a0
 do_syscall_64+0x38/0x90
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 5.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.16%
Percentil entre todas las CVEs puntuadas: 4
Fecha de la puntuación: 5/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

NVD-CWE-noinfo

Referencias

JSON original (NVD)

Mostrar

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          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to do sanity check on destination blkaddr during recovery\n\nAs Wenqing Liu reported in bugzilla:\n\nhttps://bugzilla.kernel.org/show_bug.cgi?id=216456\n\nloop5: detected capacity change from 0 to 131072\nF2FS-fs (loop5): recover_inode: ino = 6, name = hln, inline = 1\nF2FS-fs (loop5): recover_data: ino = 6 (i_size: recover) err = 0\nF2FS-fs (loop5): recover_inode: ino = 6, name = hln, inline = 1\nF2FS-fs (loop5): recover_data: ino = 6 (i_size: recover) err = 0\nF2FS-fs (loop5): recover_inode: ino = 6, name = hln, inline = 1\nF2FS-fs (loop5): recover_data: ino = 6 (i_size: recover) err = 0\nF2FS-fs (loop5): Bitmap was wrongly set, blk:5634\n------------[ cut here ]------------\nWARNING: CPU: 3 PID: 1013 at fs/f2fs/segment.c:2198\nRIP: 0010:update_sit_entry+0xa55/0x10b0 [f2fs]\nCall Trace:\n <TASK>\n f2fs_do_replace_block+0xa98/0x1890 [f2fs]\n f2fs_replace_block+0xeb/0x180 [f2fs]\n recover_data+0x1a69/0x6ae0 [f2fs]\n f2fs_recover_fsync_data+0x120d/0x1fc0 [f2fs]\n f2fs_fill_super+0x4665/0x61e0 [f2fs]\n mount_bdev+0x2cf/0x3b0\n legacy_get_tree+0xed/0x1d0\n vfs_get_tree+0x81/0x2b0\n path_mount+0x47e/0x19d0\n do_mount+0xce/0xf0\n __x64_sys_mount+0x12c/0x1a0\n do_syscall_64+0x38/0x90\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nIf we enable CONFIG_F2FS_CHECK_FS config, it will trigger a kernel panic\ninstead of warning.\n\nThe root cause is: in fuzzed image, SIT table is inconsistent with inode\nmapping table, result in triggering such warning during SIT table update.\n\nThis patch introduces a new flag DATA_GENERIC_ENHANCE_UPDATE, w/ this\nflag, data block recovery flow can check destination blkaddr's validation\nin SIT table, and skip f2fs_replace_block() to avoid inconsistent status."
    }
  ],
  "lastModified": "2026-08-15T13:17:31.530",
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