KVM: nSVM: Ignore nCR3[4:0] when loading PDPTEs from memory (Linux Linux)

CVE-2024-50115
HIGH 8.4

En bref

Source
NVD
EPSS
EPSS 0.24 % · centile 16 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Ignore nCR3[4:0] when loading PDPTEs from memory Ignore nCR3[4:0] when loading PDPTEs from memory for nested SVM, as bits 4:0 of CR3 are ignored when PAE paging is used, and thus VMRUN doesn't enforce 32-byte alignment of nCR3. In the absolute worst case scenario, failure to ignore bits 4:0 can result in an out-of-bounds read, e.g. if the target page is at the end of a memslot, and the VMM isn't using guard pages. Per the APM: The CR3 register points to the base address of the page-directory-pointer table. The page-directory-pointer table is aligned on a 32-byte boundary, with the low 5 address bits 4:0 assumed to be 0. And the SDM's much more explicit: 4:0 Ignored Note, KVM gets this right when loading PDPTRs, it's only the nSVM flow that is broken.

Faiblesses (CWE)

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1HIGH 8.4CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:HLinux
CVSS 3.1HIGH 7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:HCISA-ADP
CVSS 3.1HIGH 8.4CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)
CVSS 3.1HIGH 7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:HNVD · nvd@nist.gov (Primary)
CVSS 3.1HIGH 7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:HNVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected e4e517b4be019787ada4cbbce2f04570c21b0cbd < 76ce386feb14ec9a460784fcd495d8432acce7a5 ; affected e4e517b4be019787ada4cbbce2f04570c21b0cbd < 58cb697d80e669c56197f703e188867c8c54c494 ; affected e4e517b4be019787ada4cbbce2f04570c21b0cbd < 6876793907cbe19d42e9edc8c3315a21e06c32ae ; affected e4e517b4be019787ada4cbbce2f04570c21b0cbd < 2c4adc9b192a0815fe58a62bc0709449416cc884 ; affected e4e517b4be019787ada4cbbce2f04570c21b0cbd < 426682afec71ea3f889b972d038238807b9443e4 ; affected e4e517b4be019787ada4cbbce2f04570c21b0cbd < f559b2e9c5c5308850544ab59396b7d53cfc67bd
Linux · Linuxaffected 3.2 ; unaffected 0 < 3.2 ; unaffected 5.10.229 ≤ 5.10.* ; unaffected 5.15.170 ≤ 5.15.* ; unaffected 6.1.115 ≤ 6.1.* ; unaffected 6.6.59 ≤ 6.6.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD