CVE-2022-50295

Estado: AnalizadaMedia (5.5)—

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

io_uring/msg_ring: Fix NULL pointer dereference in io_msg_send_fd()

Syzkaller produced the below call trace:

We don't have a NULL check on file_ptr in io_msg_send_fd() function, so when file_ptr is NUL src_file is also NULL and get_file() dereferences a NULL pointer and leads to above crash.

Add a NULL check to fix this issue.

Detalles técnicos trazas, registros y código del informe original

 BUG: KASAN: null-ptr-deref in io_msg_ring+0x3cb/0x9f0
 Write of size 8 at addr 0000000000000070 by task repro/16399

 CPU: 0 PID: 16399 Comm: repro Not tainted 6.1.0-rc1 #28
 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7
 Call Trace:
  <TASK>
  dump_stack_lvl+0xcd/0x134
  ? io_msg_ring+0x3cb/0x9f0
  kasan_report+0xbc/0xf0
  ? io_msg_ring+0x3cb/0x9f0
  kasan_check_range+0x140/0x190
  io_msg_ring+0x3cb/0x9f0
  ? io_msg_ring_prep+0x300/0x300
  io_issue_sqe+0x698/0xca0
  io_submit_sqes+0x92f/0x1c30
  __do_sys_io_uring_enter+0xae4/0x24b0
....
 RIP: 0033:0x7f2eaf8f8289
 RSP: 002b:00007fff40939718 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2eaf8f8289
 RDX: 0000000000000000 RSI: 0000000000006f71 RDI: 0000000000000004
 RBP: 00007fff409397a0 R08: 0000000000000000 R09: 0000000000000039
 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004006d0
 R13: 00007fff40939880 R14: 0000000000000000 R15: 0000000000000000
  </TASK>
 Kernel panic - not syncing: panic_on_warn set ...

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: 0.14%
Percentil entre todas las CVEs puntuadas: 3
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

CWE-476

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2022-50295",
  "cveTags": [],
  "metrics": {
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        "type": "Primary",
        "source": "nvd@nist.gov",
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          "attackVector": "LOCAL",
          "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",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
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        "exploitabilityScore": 1.8
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              "versionType": "git"
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  "published": "2025-09-15T15:15:40.880",
  "references": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
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          "value": "CWE-476"
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/msg_ring: Fix NULL pointer dereference in io_msg_send_fd()\n\nSyzkaller produced the below call trace:\n\n BUG: KASAN: null-ptr-deref in io_msg_ring+0x3cb/0x9f0\n Write of size 8 at addr 0000000000000070 by task repro/16399\n\n CPU: 0 PID: 16399 Comm: repro Not tainted 6.1.0-rc1 #28\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7\n Call Trace:\n  <TASK>\n  dump_stack_lvl+0xcd/0x134\n  ? io_msg_ring+0x3cb/0x9f0\n  kasan_report+0xbc/0xf0\n  ? io_msg_ring+0x3cb/0x9f0\n  kasan_check_range+0x140/0x190\n  io_msg_ring+0x3cb/0x9f0\n  ? io_msg_ring_prep+0x300/0x300\n  io_issue_sqe+0x698/0xca0\n  io_submit_sqes+0x92f/0x1c30\n  __do_sys_io_uring_enter+0xae4/0x24b0\n....\n RIP: 0033:0x7f2eaf8f8289\n RSP: 002b:00007fff40939718 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa\n RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2eaf8f8289\n RDX: 0000000000000000 RSI: 0000000000006f71 RDI: 0000000000000004\n RBP: 00007fff409397a0 R08: 0000000000000000 R09: 0000000000000039\n R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004006d0\n R13: 00007fff40939880 R14: 0000000000000000 R15: 0000000000000000\n  </TASK>\n Kernel panic - not syncing: panic_on_warn set ...\n\nWe don't have a NULL check on file_ptr in io_msg_send_fd() function,\nso when file_ptr is NUL src_file is also NULL and get_file()\ndereferences a NULL pointer and leads to above crash.\n\nAdd a NULL check to fix this issue."
    }
  ],
  "lastModified": "2026-06-17T05:23:10.470",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
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              "versionEndExcluding": "6.0.6",
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            {
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              "matchCriteriaId": "E7E331DA-1FB0-4DEC-91AC-7DA69D461C11"
            }
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          "operator": "OR"
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}