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.
What this means for your business
- An attacker can use it remotely, over a network, without a login, and without anyone at your company clicking anything.
- FIRST's prediction model gives it a 0.6% chance of attack attempts being seen in the next 30 days, ranking above 46% of all known flaws.
What to do
- 1Ask your IT team or provider whether any of your systems use the affected product.
- 2If you do, follow the vendor's guidance. No patch reference has been published yet.
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Scoring
- CVSS
- 9.8 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Assigned by
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Dates
- Published
- 2026-01-13
- Last modified
- 2026-08-27
- Sources
- NVD
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
- https://git.kernel.org/stable/c/b8c9f25fd84328c5fcc4f70c6d1e8f1d4787eaac
- https://git.kernel.org/stable/c/ce20f49ac9194cf81a77f01d1c316d7c17ae753c