CVE-2022-49286

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/[email protected]/ 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.

• linux linux kernel (>= 4.12 < 5.4.188) • linux linux kernel (>= 5.5 < 5.10.109) • linux linux kernel (>= 5.11 < 5.15.32) • linux linux kernel (>= 5.16 < 5.16.18) • linux linux kernel 5.17