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Test your applicationsUpgrade Amazon-Linux:2023
perf
to version 0:6.1.10-15.42.amzn2023 or higher.
This issue was patched in ALAS2023-2023-070
.
Note: Versions mentioned in the description apply only to the upstream perf
package and not the perf
package as distributed by Amazon-Linux
.
See How to fix?
for Amazon-Linux:2023
relevant fixed versions and status.
There exists a use-after-free in io_uring in the Linux kernel. Signalfd_poll() and binder_poll() use a waitqueue whose lifetime is the current task. It will send a POLLFREE notification to all waiters before the queue is freed. Unfortunately, the io_uring poll doesn't handle POLLFREE. This allows a use-after-free to occur if a signalfd or binder fd is polled with io_uring poll, and the waitqueue gets freed. We recommend upgrading past commit fc78b2fc21f10c4c9c4d5d659a685710ffa63659