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CVE-2022-50307 PUBLISHED

Reported by Linux · Published September 15, 2025

In the Linux kernel, the following vulnerability has been resolved: s390/cio: fix out-of-bounds access on cio_ignore free The channel-subsystem-driver scans for newly available devices whenever device-IDs are removed from the cio_ignore list using a command such as: echo free >/proc/cio_ignore Since an I/O device scan might interfer with running I/Os, commit 172da89ed0ea ("s390/cio: avoid excessive path-verification requests") introduced an optimization to exclude online devices from the scan. The newly added check for online devices incorrectly assumes that an I/O-subchannel's drvdata points to a struct io_subchannel_private. For devices that are bound to a non-default I/O subchannel driver, such as the vfio_ccw driver, this results in an out-of-bounds read access during each scan. Fix this by changing the scan logic to rely on a driver-independent online indication. For this we can use struct subchannel->config.ena, which is the driver's requested subchannel-enabled state. Since I/Os can only be started on enabled subchannels, this matches the intent of the original optimization of not scanning devices where I/O might be running.

EPSS 0.02% · 4.9th percentile

Risk Scores

EPSS Score
0.02%
4.9th percentile

Affected Products

VendorProductVersions
LinuxLinux172da89ed0eaf9d9348f5decb86ad04c624b39d1, 172da89ed0eaf9d9348f5decb86ad04c624b39d1, 172da89ed0eaf9d9348f5decb86ad04c624b39d1
LinuxLinux5.15, 0, 5.15.78
LinuxLinux172da89ed0eaf9d9348f5decb86ad04c624b39d1, 172da89ed0eaf9d9348f5decb86ad04c624b39d1, 172da89ed0eaf9d9348f5decb86ad04c624b39d1
linuxlinux_kernel5.15, 5.15, 5.15

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