Vulnerability Description
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 block offset when calculating how many bytes can be skipped for uptodate blocks.
References
- https://git.kernel.org/stable/c/12053695c8ef5410e8cc6c9ed4c0db9cd9c82b3e
- https://git.kernel.org/stable/c/142194fb21afe964d2d194cab1fc357cbf87e899
- https://git.kernel.org/stable/c/7aa6bc3e8766990824f66ca76c19596ce10daf3e
- https://git.kernel.org/stable/c/82b60ffbb532d919959702768dca04c3c0500ae5
FAQ
What is CVE-2025-68794?
CVE-2025-68794 is a documented vulnerability. 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 ...
How severe is CVE-2025-68794?
CVSS scoring is not yet available for CVE-2025-68794. Check NVD for updates.
Is there a patch for CVE-2025-68794?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.