CVE-2022-49286 Information

Description

In the Linux kernel the following vulnerability has been resolved:

tpm: use try_get_ops() in tpm-space.c

As part of the series conversion to remove nested TPM operations:

https://lore.kernel.org/all/20190205224723.19671-1-jarkko.sakkinen@linux.intel.com/

exposure of the chip->tpm_mutex was removed from much of the upper level code. In this conversion tpm2_del_space() was missed. This didn’t matter much because it’s usually called closely after a converted operation so there’s only a very tiny race window where the chip can be removed before the space flushing is done which causes a NULL deref on the mutex. However there are reports of this window being hit in practice so fix this by converting tpm2_del_space() to use tpm_try_get_ops() which performs all the teardown checks before acquring the mutex.

Reference

https://git.kernel.org/stable/c/476ddd23f818fb94cf86fb5617f3bb9a7c92113d https://git.kernel.org/stable/c/5b1d2561a03e534064b51c50c774657833d3d2cf https://git.kernel.org/stable/c/95193d12f10a8a088843b25e0f5fe1d83ec6b079 https://git.kernel.org/stable/c/ba84f9a48366dcc3cdef978599433efe101dd5bd https://git.kernel.org/stable/c/eda1662cce964c8a65bb86321f8d9cfa6e9ceaab https://git.kernel.org/stable/c/fb5abce6b2bb5cb3d628aaa63fa821da8c4600f9