What’s Vulnerable › Vulnerabilities

CVE-2024-53085: tpm: Lock TPM chip in tpm_pm_suspend() first

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-11-19 · updated 2026-06-17
• Weakness: CWE-667

Description

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.

Affected products

• Linux kernel: from 6.4 before 6.11.8; 6.12-rc1, 6.12-rc2, 6.12-rc3, 6.12-rc4, 6.12-rc5, 6.12-rc6 — fixed in 6.11.8

How to fix

Upgrade to a fixed version: Linux kernel 6.11.8. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/9265fed6db601ee2ec47577815387458ef4f047a
• https://git.kernel.org/stable/c/bc203fe416abdd1c29da594565a7c3c4e979488e
• https://git.kernel.org/stable/c/cfaf83501a0cbb104499c5b0892ee5ebde4e967f

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