Critical 9.8Published Jan 13, 2026

CVE-2025-68794iomap: adjust read range correctly for non-block-aligned positions

Updated under an hour ago (Oct 28, 2026, 2:30 PM ET)

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Exploited in the last 30 days

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: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-190
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Deferred
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 9dc55f1389f9569acf9659e58dd836a9c70df217 before ce20f49ac9194cf81a77f01d1c316d7c17ae753c; from 9dc55f1389f9569acf9659e58dd836a9c70df217 before 275b37a1e5c2c8abd313e8075f6aec9a349f291b; from 9dc55f1389f9569acf9659e58dd836a9c70df217 before b8c9f25fd84328c5fcc4f70c6d1e8f1d4787eaac; from 9dc55f1389f9569acf9659e58dd836a9c70df217 before 82b60ffbb532d919959702768dca04c3c0500ae5; from 9dc55f1389f9569acf9659e58dd836a9c70df217 before 12053695c8ef5410e8cc6c9ed4c0db9cd9c82b3e; from 9dc55f1389f9569acf9659e58dd836a9c70df217 before 142194fb21afe964d2d194cab1fc357cbf87e899; 9dc55f1389f9569acf9659e58dd836a9c70df217 builds before 7aa6bc3e8766990824f66ca76c19596ce10daf3e	CNA record

References

References

https://git.kernel.org/stable/c/ce20f49ac9194cf81a77f01d1c316d7c17ae753c
https://git.kernel.org/stable/c/275b37a1e5c2c8abd313e8075f6aec9a349f291b
https://git.kernel.org/stable/c/b8c9f25fd84328c5fcc4f70c6d1e8f1d4787eaac
https://git.kernel.org/stable/c/82b60ffbb532d919959702768dca04c3c0500ae5
https://git.kernel.org/stable/c/12053695c8ef5410e8cc6c9ed4c0db9cd9c82b3e
https://git.kernel.org/stable/c/142194fb21afe964d2d194cab1fc357cbf87e899
https://git.kernel.org/stable/c/7aa6bc3e8766990824f66ca76c19596ce10daf3e

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.