---
id: CVE-2022-50272
title: 'media: dvb-usb: az6027: fix null-ptr-deref in az6027_i2c_xfer()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  media: dvb-usb: az6027: fix null-ptr-deref in az6027_i2c_xfer()

  Wei Chen reports a kernel bug as blew:

  general protection fault, probably for non-canonical address
  KA…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 76f9a820c8672ada12ffa0903652c9e6f2429462 <
    2b6a8a1a32746981044e7ab06649c804acb4068a
  - >-
    Linux >= 76f9a820c8672ada12ffa0903652c9e6f2429462 <
    c712d1ccbfb787620422b437a5b8fac0802547bd
  - >-
    Linux >= 76f9a820c8672ada12ffa0903652c9e6f2429462 <
    7abfe467cd685f5da7ecb415441e45e3e4e2baa8
  - >-
    Linux >= 76f9a820c8672ada12ffa0903652c9e6f2429462 <
    8b256d23361c51aa4b7fdb71176c1ca50966fb39
  - >-
    Linux >= 76f9a820c8672ada12ffa0903652c9e6f2429462 <
    559891d430e3f3a178040c4371ed419edbfa7d65
  - >-
    Linux >= 76f9a820c8672ada12ffa0903652c9e6f2429462 <
    210fcf64be4db82c0e190e74b5111e4eef661a7a
  - >-
    Linux >= 76f9a820c8672ada12ffa0903652c9e6f2429462 <
    6fbc44731a4665cbe92a5090e9804a388a72214b
  - >-
    Linux >= 76f9a820c8672ada12ffa0903652c9e6f2429462 <
    6b60cf73a931af34b7a0a3f467a79d9fe0df2d70
  - >-
    Linux >= 76f9a820c8672ada12ffa0903652c9e6f2429462 <
    0ed554fd769a19ea8464bb83e9ac201002ef74ad
  - Linux 2.6.34
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:08:25.642549Z'
published: '2025-09-15'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:10:32.172Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2022-50272'
references:
  - url: 'https://git.kernel.org/stable/c/2b6a8a1a32746981044e7ab06649c804acb4068a'
  - url: 'https://git.kernel.org/stable/c/c712d1ccbfb787620422b437a5b8fac0802547bd'
  - url: 'https://git.kernel.org/stable/c/7abfe467cd685f5da7ecb415441e45e3e4e2baa8'
  - url: 'https://git.kernel.org/stable/c/8b256d23361c51aa4b7fdb71176c1ca50966fb39'
  - url: 'https://git.kernel.org/stable/c/559891d430e3f3a178040c4371ed419edbfa7d65'
  - url: 'https://git.kernel.org/stable/c/210fcf64be4db82c0e190e74b5111e4eef661a7a'
  - url: 'https://git.kernel.org/stable/c/6fbc44731a4665cbe92a5090e9804a388a72214b'
  - url: 'https://git.kernel.org/stable/c/6b60cf73a931af34b7a0a3f467a79d9fe0df2d70'
  - url: 'https://git.kernel.org/stable/c/0ed554fd769a19ea8464bb83e9ac201002ef74ad'
tags:
  - cve.org
epss: 0.00163
epssPercentile: 0.05553
ingestedAt: '2026-11-05T22:38:31.716Z'
---

## Overview

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

media: dvb-usb: az6027: fix null-ptr-deref in az6027_i2c_xfer()

Wei Chen reports a kernel bug as blew:

general protection fault, probably for non-canonical address
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
...
Call Trace:
<TASK>
__i2c_transfer+0x77e/0x1930 drivers/i2c/i2c-core-base.c:2109
i2c_transfer+0x1d5/0x3d0 drivers/i2c/i2c-core-base.c:2170
i2cdev_ioctl_rdwr+0x393/0x660 drivers/i2c/i2c-dev.c:297
i2cdev_ioctl+0x75d/0x9f0 drivers/i2c/i2c-dev.c:458
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd834a8bded

In az6027_i2c_xfer(), if msg[i].addr is 0x99,
a null-ptr-deref will caused when accessing msg[i].buf.
For msg[i].len is 0 and msg[i].buf is null.

Fix this by checking msg[i].len in az6027_i2c_xfer().

## Affected

- `Linux >= 76f9a820c8672ada12ffa0903652c9e6f2429462 < 2b6a8a1a32746981044e7ab06649c804acb4068a`
- `Linux >= 76f9a820c8672ada12ffa0903652c9e6f2429462 < c712d1ccbfb787620422b437a5b8fac0802547bd`
- `Linux >= 76f9a820c8672ada12ffa0903652c9e6f2429462 < 7abfe467cd685f5da7ecb415441e45e3e4e2baa8`
- `Linux >= 76f9a820c8672ada12ffa0903652c9e6f2429462 < 8b256d23361c51aa4b7fdb71176c1ca50966fb39`
- `Linux >= 76f9a820c8672ada12ffa0903652c9e6f2429462 < 559891d430e3f3a178040c4371ed419edbfa7d65`
- `Linux >= 76f9a820c8672ada12ffa0903652c9e6f2429462 < 210fcf64be4db82c0e190e74b5111e4eef661a7a`
- `Linux >= 76f9a820c8672ada12ffa0903652c9e6f2429462 < 6fbc44731a4665cbe92a5090e9804a388a72214b`
- `Linux >= 76f9a820c8672ada12ffa0903652c9e6f2429462 < 6b60cf73a931af34b7a0a3f467a79d9fe0df2d70`
- `Linux >= 76f9a820c8672ada12ffa0903652c9e6f2429462 < 0ed554fd769a19ea8464bb83e9ac201002ef74ad`
- `Linux 2.6.34`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.