Overview
About vulnerability
In the Linux kernel, the following vulnerability has been resolved:
comedi: das16m1: Fix bit shift out of bounds
When checking for a supported IRQ number, the following test is used:
/* only irqs 2, 3, 4, 5, 6, 7, 10, 11, 12, 14, and 15 are valid */ if ((1 « it->options[1]) & 0xdcfc) {
However, it->options[i] is an unchecked int value from userspace, so
the shift amount could be negative or out of bounds. Fix the test by
requiring it->options[1] to be within bounds before proceeding with
the original test.
Details
- Affected product:
- AlmaLinux 9.2 ESU , CentOS 8.4 ELS , CentOS 8.5 ELS , CentOS Stream 8 ELS , Oracle Linux 7 ELS , TuxCare 9.6 ESU , Ubuntu 16.04 ELS , Ubuntu 18.04 ELS , Ubuntu 20.04 ELS
- Affected packages:
- kernel @ 4.18.0 (+9 more)
In the Linux kernel, the following vulnerability has been resolved:
comedi: das16m1: Fix bit shift out of bounds
When checking for a supported IRQ number, the following test is used:
/* only irqs 2, 3, 4, 5, 6, 7, 10, 11, 12, 14, and 15 are valid */ if ((1 « it->options[1]) & 0xdcfc) {
However, it->options[i] is an unchecked int value from userspace, so
the shift amount could be negative or out of bounds. Fix the test by
requiring it->options[1] to be within bounds before proceeding with
the original test.