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Review reviewHigh

CVE-2024-46852

Linux Linux, debian linux, linux kernel

In 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 d...

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2024.09.27
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

In 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 d...

Affected product and versions

Product
Linux Linux, debian linux, linux kernel
Affected versions
>= a5d2d29e24be8967ef78a1b1fb2292413e3b3df9 < 79cce5e81d20fa9ad553be439d665ac3302d3c95, >= a5d2d29e24be8967ef78a1b1fb2292413e3b3df9 < 84175dc5b2c932266a50c04e5ce342c30f817a2f, >= a5d2d29e24be8967ef78a1b1fb2292413e3b3df9 < eb7fc8b65cea22f9038c52398c8b22849e9620ea, >= a5d2d29e24be8967ef78a1b1fb2292413e3b3df9 < e79050882b857c37634baedbdcf7c2047c24cbff, >= a5d2d29e24be8967ef78a1b1fb2292413e3b3df9 < ea5ff5d351b520524019f7ff7f9ce418de2dad87, >= 5.11, 11.0, >= 5.11 < 5.15.168, >= 5.16 < 6.1.111, >= 6.2 < 6.6.52, >= 6.7 < 6.10.11, 6.11
Fixed versions
5.15.168, 6.1.111, 6.6.52, 6.10.11

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, debian linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-193