In the Linux kernel, the following vulnerability has been resolved:

tpm: Lock TPM chip in tpm_pm_suspend() first

Setting TPM_CHIP_FLAG_SUSPENDED in the end of tpm_pm_suspend() can be racy
according, as this leaves window for tpm_hwrng_read() to be called while
the operation is in progress. The recent bug report gives also evidence of
this behaviour.

Aadress this by locking the TPM chip before checking any chip->flags both
in tpm_pm_suspend() and tpm_hwrng_read(). Move TPM_CHIP_FLAG_SUSPENDED
check inside tpm_get_random() so that it will be always checked only when
the lock is reserved.

References

• https://nvd.nist.gov/vuln/detail/CVE-2024-53085
• https://git.kernel.org/stable/c/9265fed6db601ee2ec47577815387458ef4f047a
• https://git.kernel.org/stable/c/bc203fe416abdd1c29da594565a7c3c4e979488e
• https://git.kernel.org/stable/c/cfaf83501a0cbb104499c5b0892ee5ebde4e967f