CVE-2025-68794

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.

CVSS 3.1

9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.7% chance of exploitation in the next 30 days; higher than 52% of CVEs (scores of 2026-10-25)

CWE

CWE-190

Published

2026-01-13

Modified

2026-10-19

Record from

the NVD, synced 2026-10-21

References

• https://git.kernel.org/stable/c/12053695c8ef5410e8cc6c9ed4c0db9cd9c82b3e
• https://git.kernel.org/stable/c/142194fb21afe964d2d194cab1fc357cbf87e899
• https://git.kernel.org/stable/c/275b37a1e5c2c8abd313e8075f6aec9a349f291b
• https://git.kernel.org/stable/c/7aa6bc3e8766990824f66ca76c19596ce10daf3e
• https://git.kernel.org/stable/c/82b60ffbb532d919959702768dca04c3c0500ae5

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