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Review reviewHigh

CVE-2024-50250

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: fsdax: dax_unshare_iter needs to copy entire blocks The code that copies data from srcmap to iomap in dax_unshare_iter is very very broken, which bfoster's recent fsx changes have exposed. If the pos and len passed to dax_file_unshare are not aligned to an fsblock boundary, the iter pos and length in the _iter function will reflect this unalignment. dax_iomap_direct_access always returns a pointer to the start of the kmapped fsdax page, even if its pos argument is in the middle of that page. This is catastrophic for data in...

CVSS
7.1
EPSS
-
- percentile
CISA KEV
Not listed
Published
2024.11.09
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.1

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: fsdax: dax_unshare_iter needs to copy entire blocks The code that copies data from srcmap to iomap in dax_unshare_iter is very very broken, which bfoster's recent fsx changes have exposed. If the pos and len passed to dax_file_unshare are not aligned to an fsblock boundary, the iter pos and length in the _iter function will reflect this unalignment. dax_iomap_direct_access always returns a pointer to the start of the kmapped fsdax page, even if its pos argument is in the middle of that page. This is catastrophic for data in...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 1bec6782a25c9b92c203ea7a1b3e3dc6a468cbc4 < bdbc96c23197d773a7d1bf03e4f11de593b0ff28, >= d984648e428bf88cbd94ebe346c73632cb92fffb < 9bc18bb476e50e32e5d08f2734d63d63e0fa528c, >= d984648e428bf88cbd94ebe346c73632cb92fffb < 8e9c0f500b42216ef930f5c0d1703989a451913d, >= d984648e428bf88cbd94ebe346c73632cb92fffb < 50793801fc7f6d08def48754fb0f0706b0cfc394, >= 6.1.113 < 6.1.116, >= 6.2, >= 6.2 < 6.6.60, >= 6.7 < 6.11.7, 6.12
Fixed versions
6.1.116, 6.6.60, 6.11.7

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux 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:N
CWE
Not available