dma-buf: heaps: Fix off-by-one in CMA heap fault handler

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Summary

CVECVE-2024-46852
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-09-27 13:15:16 UTC
Updated2026-05-05 15:20:17 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: dma-buf: heaps: Fix off-by-one in CMA heap fault handler Until VM_DONTEXPAND was added in commit 1c1914d6e8c6 ("dma-buf: heaps: Don't track CMA dma-buf pages under RssFile") it was possible to obtain a mapping larger than the buffer size via mremap and bypass the overflow check in dma_buf_mmap_internal. When using such a mapping to attempt to fault past the end of the buffer, the CMA heap fault handler also checks the fault offset against the buffer size, but gets the boundary wrong by 1. Fix the boundary check so that we don't read off the end of the pages array and insert an arbitrary page in the mapping.

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-193

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 Debian Debian Linux 11.0 All All All
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a5d2d29e24be8967ef78a1b1fb2292413e3b3df9 79cce5e81d20fa9ad553be439d665ac3302d3c95 git Not specified
CNA Linux Linux affected a5d2d29e24be8967ef78a1b1fb2292413e3b3df9 84175dc5b2c932266a50c04e5ce342c30f817a2f git Not specified
CNA Linux Linux affected a5d2d29e24be8967ef78a1b1fb2292413e3b3df9 eb7fc8b65cea22f9038c52398c8b22849e9620ea git Not specified
CNA Linux Linux affected a5d2d29e24be8967ef78a1b1fb2292413e3b3df9 e79050882b857c37634baedbdcf7c2047c24cbff git Not specified
CNA Linux Linux affected a5d2d29e24be8967ef78a1b1fb2292413e3b3df9 ea5ff5d351b520524019f7ff7f9ce418de2dad87 git Not specified
CNA Linux Linux affected 5.11 Not specified
CNA Linux Linux unaffected 5.11 semver Not specified
CNA Linux Linux unaffected 5.15.168 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.111 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.52 6.6.* semver Not specified
CNA Linux Linux unaffected 6.10.11 6.10.* semver Not specified
CNA Linux Linux unaffected 6.11 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/79cce5e81d20fa9ad553be439d665ac3302d3c95 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e79050882b857c37634baedbdcf7c2047c24cbff 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/eb7fc8b65cea22f9038c52398c8b22849e9620ea 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/84175dc5b2c932266a50c04e5ce342c30f817a2f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/01/msg00001.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/ea5ff5d351b520524019f7ff7f9ce418de2dad87 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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