CVE-2024-26990
KVM: x86/mmu: Write-protect L2 SPTEs in TDP MMU when clearing dirty status
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
In the Linux kernel, the following vulnerability has been resolved:
KVM: x86/mmu: Write-protect L2 SPTEs in TDP MMU when clearing dirty status
Check kvm_mmu_page_ad_need_write_protect() when deciding whether to
write-protect or clear D-bits on TDP MMU SPTEs, so that the TDP MMU
accounts for any role-specific reasons for disabling D-bit dirty logging.
Specifically, TDP MMU SPTEs must be write-protected when the TDP MMU is
being used to run an L2 (i.e. L1 has disabled EPT) and PML is enabled.
KVM always disables PML when running L2, even when L1 and L2 GPAs are in
the some domain, so failing to write-protect TDP MMU SPTEs will cause
writes made by L2 to not be reflected in the dirty log.
[sean: massage shortlog and changelog, tweak ternary op formatting]
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: x86/mmu: Proteger contra escritura los SPTE L2 en la MMU TDP al borrar el estado sucio. Verifique kvm_mmu_page_ad_need_write_protect() cuando decida si desea proteger contra escritura o borrar los bits D en los SPTE de la MMU TDP. , de modo que la MMU TDP tenga en cuenta cualquier motivo específico de la función para deshabilitar el registro sucio de bits D. Específicamente, los SPTE de TDP MMU deben estar protegidos contra escritura cuando la TDP MMU se utiliza para ejecutar un L2 (es decir, L1 tiene EPT deshabilitado) y PML está habilitado. KVM siempre desactiva PML cuando se ejecuta L2, incluso cuando los GPA L1 y L2 están en algún dominio, por lo que si no se protegen contra escritura los SPTE TDP MMU, las escrituras realizadas por L2 no se reflejarán en el registro sucio. [sean: masajear el registro corto y el registro de cambios, modificar el formato de operación ternario]
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-02-19 CVE Reserved
- 2024-05-01 CVE Published
- 2024-05-13 EPSS Updated
- 2024-12-19 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
References (6)
| URL | Tag | Source |
|---|---|---|
| https://git.kernel.org/stable/c/5982a5392663b30f57ee90b0372c19a7e9cb655a | Vuln. Introduced |
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2024-26990 | 2024-11-12 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2278320 | 2024-11-12 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 6.4 < 6.6.29 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.4 < 6.6.29" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 6.4 < 6.8.8 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.4 < 6.8.8" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 6.4 < 6.9 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.4 < 6.9" | en |
Affected
| ||||||