riscv: mm: Fix the out of bound issue of vmemmap address

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Summary

CVECVE-2024-57945
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-01-21 13:15:09 UTC
Updated2026-06-01 17:16:32 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: riscv: mm: Fix the out of bound issue of vmemmap address In sparse vmemmap model, the virtual address of vmemmap is calculated as: ((struct page *)VMEMMAP_START - (phys_ram_base >> PAGE_SHIFT)). And the struct page's va can be calculated with an offset: (vmemmap + (pfn)). However, when initializing struct pages, kernel actually starts from the first page from the same section that phys_ram_base belongs to. If the first page's physical address is not (phys_ram_base >> PAGE_SHIFT), then we get an va below VMEMMAP_START when calculating va for it's struct page. For example, if phys_ram_base starts from 0x82000000 with pfn 0x82000, the first page in the same section is actually pfn 0x80000. During init_unavailable_range(), we will initialize struct page for pfn 0x80000 with virtual address ((struct page *)VMEMMAP_START - 0x2000), which is below VMEMMAP_START as well as PCI_IO_END. This commit fixes this bug by introducing a new variable 'vmemmap_start_pfn' which is aligned with memory section size and using it to calculate vmemmap address instead of phys_ram_base.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

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

Problem Types: CWE-125

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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 8af1c121b0102041809bc137ec600d1865eaeedd 04350304428063da6a55a8a4597d409dc69148b2 git Not specified
CNA Linux Linux affected 8310080799b40fd9f2a8b808c657269678c149af 92f08673d3f1893191323572f60e3c62f2e57c2f git Not specified
CNA Linux Linux affected a278d5c60f21aa15d540abb2f2da6e6d795c3e6e a4a7ac3d266008018f05fae53060fcb331151a14 git Not specified
CNA Linux Linux affected a11dd49dcb9376776193e15641f84fcc1e5980c9 d2bd51954ac8377c2f1eb1813e694788998add66 git Not specified
CNA Linux Linux affected a11dd49dcb9376776193e15641f84fcc1e5980c9 f754f27e98f88428aaf6be6e00f5cbce97f62d4b git Not specified
CNA Linux Linux affected 5941a90c55d3bfba732b32208d58d997600b44ef git Not specified
CNA Linux Linux affected 2a1728c15ec4f45ed9248ae22f626541c179bfbe git Not specified
CNA Linux Linux affected 5.10.212 5.10.258 semver Not specified
CNA Linux Linux affected 6.1.81 6.1.140 semver Not specified
CNA Linux Linux affected 6.6.21 6.6.72 semver Not specified
CNA Linux Linux affected 5.15.151 5.16 semver Not specified
CNA Linux Linux affected 6.7.9 6.8 semver Not specified
CNA Linux Linux affected 6.8 Not specified
CNA Linux Linux unaffected 6.8 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 6.1.140 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.72 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.10 6.12.* semver Not specified
CNA Linux Linux unaffected 6.13 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a4a7ac3d266008018f05fae53060fcb331151a14 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d2bd51954ac8377c2f1eb1813e694788998add66 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/08/msg00010.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/04350304428063da6a55a8a4597d409dc69148b2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f754f27e98f88428aaf6be6e00f5cbce97f62d4b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/92f08673d3f1893191323572f60e3c62f2e57c2f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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