CVE-2024-49851
Description
A flaw was found in the Linux kernel's Trusted Platform Module (TPM) driver. When a TPM command transmission fails, the driver does not properly clean up allocated resources, leading to a leak of transient handles. This resource exhaustion can result in a denial of service, making the TPM device unavailable for further operations.
Mitigation
If the Trusted Platform Module (TPM) functionality is not required, the `tpm_tis` kernel module can be prevented from loading to mitigate this vulnerability.
To blacklist the `tpm_tis` module:
1. Create a new configuration file:
`echo "blacklist tpm_tis" | sudo tee /etc/modprobe.d/blacklist-tpm_tis.conf`
2. Regenerate the initramfs to ensure the blacklist is applied at boot:
`sudo dracut -f` (for systems using dracut) or `sudo mkinitcpio -P` (for systems using mkinitcpio)
3. Reboot the system for the changes to take effect.
This mitigation will disable TPM functionality, which may impact applications or features that rely on it.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.1 | 5.5 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | Low | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | High | None | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Other,Confidentiality,Integrity
Technical Impact: Other; Read Application Data; Modify Application Data; DoS: Resource Consumption (Other)
It is possible to overflow the number of temporary files because directories typically have limits on the number of files allowed. This could create a denial of service problem.
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