drivers/virt/acrn: fix PFNMAP PTE checks in acrn_vm_ram_map()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2024-38610
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-06-19 14:15:20 UTC
Updated2026-08-04 11:18:51 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drivers/virt/acrn: fix PFNMAP PTE checks in acrn_vm_ram_map() Patch series "mm: follow_pte() improvements and acrn follow_pte() fixes". Patch #1 fixes a bunch of issues I spotted in the acrn driver. It compiles, that's all I know. I'll appreciate some review and testing from acrn folks. Patch #2+#3 improve follow_pte(), passing a VMA instead of the MM, adding more sanity checks, and improving the documentation. Gave it a quick test on x86-64 using VM_PAT that ends up using follow_pte(). This patch (of 3): We currently miss handling various cases, resulting in a dangerous follow_pte() (previously follow_pfn()) usage. (1) We're not checking PTE write permissions. Maybe we should simply always require pte_write() like we do for pin_user_pages_fast(FOLL_WRITE)? Hard to tell, so let's check for ACRN_MEM_ACCESS_WRITE for now. (2) We're not rejecting refcounted pages. As we are not using MMU notifiers, messing with refcounted pages is dangerous and can result in use-after-free. Let's make sure to reject them. (3) We are only looking at the first PTE of a bigger range. We only lookup a single PTE, but memmap->len may span a larger area. Let's loop over all involved PTEs and make sure the PFN range is actually contiguous. Reject everything else: it couldn't have worked either way, and rather made use access PFNs we shouldn't be accessing.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-416

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b9c43aa0b18da5619aac347d54cb67fe30d1f884 5c6705aa47b5b78d7ad36fea832bb69caa5bf49a git Not specified
CNA Linux Linux affected 8a6e85f75a83d16a71077e41f2720c691f432002 afeb0e69627695f759fc73c39c1640dbf8649b32 git Not specified
CNA Linux Linux affected 8a6e85f75a83d16a71077e41f2720c691f432002 e873f36ec890bece26ecce850e969917bceebbb6 git Not specified
CNA Linux Linux affected 8a6e85f75a83d16a71077e41f2720c691f432002 4c4ba3cf3a15ccfbaf787d0296fa42cdb00da9b4 git Not specified
CNA Linux Linux affected 8a6e85f75a83d16a71077e41f2720c691f432002 2c8d6e24930b8ef7d4a81787627c559ae0e0d3bb git Not specified
CNA Linux Linux affected 8a6e85f75a83d16a71077e41f2720c691f432002 3d6586008f7b638f91f3332602592caa8b00b559 git Not specified
CNA Linux Linux affected 149d5fb7e0124c3763e92edd1fde19417f4d2d09 git Not specified
CNA Linux Linux affected 02098ac42b7ff055ec72cd083ee1eb0a23481a19 git Not specified
CNA Linux Linux affected 5.15.33 5.15.161 semver Not specified
CNA Linux Linux affected 5.16.19 5.17 semver Not specified
CNA Linux Linux affected 5.17.2 5.18 semver Not specified
CNA Linux Linux affected 5.18 Not specified
CNA Linux Linux unaffected 5.18 semver Not specified
CNA Linux Linux unaffected 5.15.161 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.93 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.33 6.6.* semver Not specified
CNA Linux Linux unaffected 6.8.12 6.8.* semver Not specified
CNA Linux Linux unaffected 6.9.3 6.9.* semver Not specified
CNA Linux Linux unaffected 6.10 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e873f36ec890bece26ecce850e969917bceebbb6 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/5c6705aa47b5b78d7ad36fea832bb69caa5bf49a af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/2c8d6e24930b8ef7d4a81787627c559ae0e0d3bb af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/3d6586008f7b638f91f3332602592caa8b00b559 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/afeb0e69627695f759fc73c39c1640dbf8649b32 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/4c4ba3cf3a15ccfbaf787d0296fa42cdb00da9b4 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
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