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Review reviewCritical

CVE-2025-68794

Linux

In the Linux kernel, the following vulnerability has been resolved: iomap: adjust read range correctly for non-block-aligned positions iomap_adjust_read_range() assumes that the position and length passed in are block-aligned. This is not always the case however, as shown in the syzbot generated case for erofs. This causes too many bytes to be skipped for uptodate blocks, which results in returning the incorrect position and length to read in. If all the blocks are uptodate, this underflows length and returns a position beyond the folio. Fix the calculation to also take into account the blo...

CVSS
9.8
EPSS
0.46%
37.4% percentile
CISA KEV
Not listed
Published
2026.01.14
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.46%
Technical severityCVSS 9.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: iomap: adjust read range correctly for non-block-aligned positions iomap_adjust_read_range() assumes that the position and length passed in are block-aligned. This is not always the case however, as shown in the syzbot generated case for erofs. This causes too many bytes to be skipped for uptodate blocks, which results in returning the incorrect position and length to read in. If all the blocks are uptodate, this underflows length and returns a position beyond the folio. Fix the calculation to also take into account the blo...

Affected product and versions

Product
Linux
Affected versions
>= 9dc55f1389f9569acf9659e58dd836a9c70df217 < 82b60ffbb532d919959702768dca04c3c0500ae5, >= 9dc55f1389f9569acf9659e58dd836a9c70df217 < 12053695c8ef5410e8cc6c9ed4c0db9cd9c82b3e, >= 9dc55f1389f9569acf9659e58dd836a9c70df217 < 142194fb21afe964d2d194cab1fc357cbf87e899, >= 9dc55f1389f9569acf9659e58dd836a9c70df217 < 7aa6bc3e8766990824f66ca76c19596ce10daf3e, >= 4.19
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux 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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available