Bug 2327358 (CVE-2024-53085)

Summary: CVE-2024-53085 kernel: tpm: Lock TPM chip in tpm_pm_suspend() first
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Bug Depends On: 2327466    
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Description OSIDB Bzimport 2024-11-19 18:02:52 UTC 
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.
Comment 1 Robb Gatica 2024-11-19 21:09:14 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024111905-CVE-2024-53085-9cf3@gregkh/T
Comment 2 errata-xmlrpc 2025-05-13 08:35:57 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:6966 https://access.redhat.com/errata/RHSA-2025:6966