CVE-2024-49858

Description

In the Linux kernel, the following vulnerability has been resolved: efistub/tpm: Use ACPI reclaim memory for event log to avoid corruption The TPM event log table is a Linux specific construct, where the data produced by the GetEventLog() boot service is cached in memory, and passed on to the OS using an EFI configuration table. The use of EFI_LOADER_DATA here results in the region being left unreserved in the E820 memory map constructed by the EFI stub, and this is the memory description that is passed on to the incoming kernel by kexec, which is therefore unaware that the region should be reserved. Even though the utility of the TPM2 event log after a kexec is questionable, any corruption might send the parsing code off into the weeds and crash the kernel. So let's use EFI_ACPI_RECLAIM_MEMORY instead, which is always treated as reserved by the E820 conversion logic.

Gravité et risque d'exploitation

CVE-2024-49858 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.21 %, ce qui la place devant 11.0 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions 6.12, <5b22c038fb2757c652642933de5664da471f8cb7, <=6.1.*, <=6.11.*, <4.16, 6.10.13, 0, <19fd2f2c5fb36b61506d3208474bfd8fdf1cada3, <f76b69ab9cf04358266e3cea5748c0c2791fbb08, <=5.10.*, <=6.6.*, <38d9b07d99b789efb6d8dda21f1aaad636c38993, <77d48d39e99170b528e4f2e9fc5d1d64cdedd386, <=6.10.*, 6.6.54, 6.1.113, 4.16, 33b6d03469b2206fb51ecc37f40411a857ad8fff, <=*, <=5.15.*, <11690d7e76842f29b60fbb5b35bc97d206ea0e83, 5.10.227, 5.15.168, 6.11.2, <2e6871a632a99d9b9e2ce3a7847acabe99e5a26e) est présent sur votre parc.
• Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
• À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
• Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

• https://git.kernel.org/stable/c/f76b69ab9cf04358266e3cea5748c0c2791fbb08
• https://git.kernel.org/stable/c/11690d7e76842f29b60fbb5b35bc97d206ea0e83
• https://git.kernel.org/stable/c/5b22c038fb2757c652642933de5664da471f8cb7
• https://git.kernel.org/stable/c/19fd2f2c5fb36b61506d3208474bfd8fdf1cada3
• https://git.kernel.org/stable/c/38d9b07d99b789efb6d8dda21f1aaad636c38993
• https://git.kernel.org/stable/c/2e6871a632a99d9b9e2ce3a7847acabe99e5a26e
• https://git.kernel.org/stable/c/77d48d39e99170b528e4f2e9fc5d1d64cdedd386