CVE-2022-50272 media: dvb-usb: az6027: fix null-ptr-deref in az6027_i2c_xfer()
A null pointer dereference in the Linux kernel's az6027 USB driver allows local attackers to cause a system crash via crafted I2C ioctl calls.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-50272?
CVE-2022-50272 is a medium-severity vulnerability in Linux kernel, published on 15 Sep 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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().
Weakness: CWE-476
Which versions are affected by CVE-2022-50272?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-50272?
Apply the vendor's patch.
Is CVE-2022-50272 being exploited?
There is no known exploitation of CVE-2022-50272 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-50272, GHSA-q5mm-hfp5-3xxh, UBUNTU-CVE-2022-50272.