CVE-2022-49072

Summary

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

gpio: Restrict usage of GPIO chip irq members before initialization

GPIO chip irq members are exposed before they could be completely initialized and this leads to race conditions.

One such issue was observed for the gc->irq.domain variable which was accessed through the I2C interface in gpiochip_to_irq() before it could be initialized by gpiochip_add_irqchip(). This resulted in Kernel NULL pointer dereference.

Following are the logs for reference :-

kernel: Call Trace: kernel: gpiod_to_irq+0x53/0x70 kernel: acpi_dev_gpio_irq_get_by+0x113/0x1f0 kernel: i2c_acpi_get_irq+0xc0/0xd0 kernel: i2c_device_probe+0x28a/0x2a0 kernel: really_probe+0xf2/0x460 kernel: RIP: 0010:gpiochip_to_irq+0x47/0xc0

To avoid such scenarios, restrict usage of GPIO chip irq members before they are completely initialized.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux48057ed1840fde9239b1e000bea1a0a1f07c5e99 < 7e88a50704b0c49ad3f2d11e8b963341cf68a89faffected
LinuxLinux48057ed1840fde9239b1e000bea1a0a1f07c5e99 < 0912cf021fb5749372b3782611d8b1de4986c13aaffected
LinuxLinux48057ed1840fde9239b1e000bea1a0a1f07c5e99 < 2c1fa3614795e2b24da1ba95de0b27b8f6ea4537affected
LinuxLinux48057ed1840fde9239b1e000bea1a0a1f07c5e99 < f8dea54f74cae8c2e4d7b2952e8fed7743a85c87affected
LinuxLinux48057ed1840fde9239b1e000bea1a0a1f07c5e99 < 5467801f1fcbdc46bc7298a84dbf3ca1ff2a7320affected
LinuxLinux44dfa46aaf7cf594ac89bc1a0c0e56c498b31269affected
LinuxLinux5.2.14 < 5.3affected
LinuxLinux5.3affected
LinuxLinux0 < 5.3unaffected
LinuxLinux5.10.111 <= 5.10.*unaffected
LinuxLinux5.15.34 <= 5.15.*unaffected
LinuxLinux5.16.20 <= 5.16.*unaffected
LinuxLinux5.17.3 <= 5.17.*unaffected
LinuxLinux5.18 <= *unaffected

Weaknesses

References