CVE-2026-89994 in Linux
要約
〜によって MITRE • 2026年09月16日
In the Linux kernel, the following vulnerability has been resolved:
dmaengine: fsl-edma: tracing: no ptr dereference during log output
The fsl edma events store a pointer to a struct fsl_edma_engine in the ringbuffer and dereference it when a log entry is printed. At this time, the pointer may no longer be valid.
Event injection can be used to trigger a crash:
$ cd /sys/kernel/tracing $ echo 'value = 0' > events/fsl_edma/edma_writeb/inject $ cat trace
The log output needs only edma->membase. Add a membase field at the end of the event and use the new field for log output. Keep the existing fields for backward compatibility.
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