CVE-2022-50435

Estado: AnalizadaMedia (5.5)—

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

ext4: avoid crash when inline data creation follows DIO write

When inode is created and written to using direct IO, there is nothing to clear the EXT4_STATE_MAY_INLINE_DATA flag. Thus when inode gets truncated later to say 1 byte and written using normal write, we will try to store the data as inline data. This confuses the code later because the inode now has both normal block and inline data allocated and the confusion manifests for example as:

Fix the problem by clearing EXT4_STATE_MAY_INLINE_DATA when we are doing direct IO write to a file.

Detalles técnicos trazas, registros y código del informe original

kernel BUG at fs/ext4/inode.c:2721!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 359 Comm: repro Not tainted 5.19.0-rc8-00001-g31ba1e3b8305-dirty #15
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-1.fc36 04/01/2014
RIP: 0010:ext4_writepages+0x363d/0x3660
RSP: 0018:ffffc90000ccf260 EFLAGS: 00010293
RAX: ffffffff81e1abcd RBX: 0000008000000000 RCX: ffff88810842a180
RDX: 0000000000000000 RSI: 0000008000000000 RDI: 0000000000000000
RBP: ffffc90000ccf650 R08: ffffffff81e17d58 R09: ffffed10222c680b
R10: dfffe910222c680c R11: 1ffff110222c680a R12: ffff888111634128
R13: ffffc90000ccf880 R14: 0000008410000000 R15: 0000000000000001
FS:  00007f72635d2640(0000) GS:ffff88811b000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000565243379180 CR3: 000000010aa74000 CR4: 0000000000150eb0
Call Trace:
 <TASK>
 do_writepages+0x397/0x640
 filemap_fdatawrite_wbc+0x151/0x1b0
 file_write_and_wait_range+0x1c9/0x2b0
 ext4_sync_file+0x19e/0xa00
 vfs_fsync_range+0x17b/0x190
 ext4_buffered_write_iter+0x488/0x530
 ext4_file_write_iter+0x449/0x1b90
 vfs_write+0xbcd/0xf40
 ksys_write+0x198/0x2c0
 __x64_sys_write+0x7b/0x90
 do_syscall_64+0x3d/0x90
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
 </TASK>

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: 6/10/2026

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

{
  "id": "CVE-2022-50435",
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          "attackVector": "LOCAL",
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
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        "exploitabilityScore": 1.8
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: avoid crash when inline data creation follows DIO write\n\nWhen inode is created and written to using direct IO, there is nothing\nto clear the EXT4_STATE_MAY_INLINE_DATA flag. Thus when inode gets\ntruncated later to say 1 byte and written using normal write, we will\ntry to store the data as inline data. This confuses the code later\nbecause the inode now has both normal block and inline data allocated\nand the confusion manifests for example as:\n\nkernel BUG at fs/ext4/inode.c:2721!\ninvalid opcode: 0000 [#1] PREEMPT SMP KASAN\nCPU: 0 PID: 359 Comm: repro Not tainted 5.19.0-rc8-00001-g31ba1e3b8305-dirty #15\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-1.fc36 04/01/2014\nRIP: 0010:ext4_writepages+0x363d/0x3660\nRSP: 0018:ffffc90000ccf260 EFLAGS: 00010293\nRAX: ffffffff81e1abcd RBX: 0000008000000000 RCX: ffff88810842a180\nRDX: 0000000000000000 RSI: 0000008000000000 RDI: 0000000000000000\nRBP: ffffc90000ccf650 R08: ffffffff81e17d58 R09: ffffed10222c680b\nR10: dfffe910222c680c R11: 1ffff110222c680a R12: ffff888111634128\nR13: ffffc90000ccf880 R14: 0000008410000000 R15: 0000000000000001\nFS:  00007f72635d2640(0000) GS:ffff88811b000000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000565243379180 CR3: 000000010aa74000 CR4: 0000000000150eb0\nCall Trace:\n <TASK>\n do_writepages+0x397/0x640\n filemap_fdatawrite_wbc+0x151/0x1b0\n file_write_and_wait_range+0x1c9/0x2b0\n ext4_sync_file+0x19e/0xa00\n vfs_fsync_range+0x17b/0x190\n ext4_buffered_write_iter+0x488/0x530\n ext4_file_write_iter+0x449/0x1b90\n vfs_write+0xbcd/0xf40\n ksys_write+0x198/0x2c0\n __x64_sys_write+0x7b/0x90\n do_syscall_64+0x3d/0x90\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n </TASK>\n\nFix the problem by clearing EXT4_STATE_MAY_INLINE_DATA when we are doing\ndirect IO write to a file."
    }
  ],
  "lastModified": "2026-06-17T05:23:33.110",
  "configurations": [
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