CVE-2026-68145iomap: fix out-of-bounds bitmap_set() with zero-length range
- 7.8HighCVSS base score
- 0.14%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: iomap: fix out-of-bounds bitmap_set() with zero-length range ifs_set_range_dirty() and ifs_set_range_uptodate() compute last_blk as (off + len - 1) >> i_blkbits. When off is 0 and len is 0, the unsigned subtraction underflows to SIZE_MAX, producing a huge last_blk and nr_blks value that causes bitmap_set() to write far beyond the ifs->state allocation. Regarding ifs_set_range_uptodate(), it is temporarily safe because len cannot be passed in as 0. However, for ifs_set_range_dirty() this is reachable from __iomap_write_end(): when copy_folio_from_iter_atomic() returns 0 (e.g. user buffer fault) and the folio is already uptodate, the guard at the top of __iomap_write_end() does not trigger because !folio_test_uptodate() is false, and iomap_set_range_dirty() is called with copied == 0. Add a !len guard to both functions before the computation, so that a zero-length range is a no-op.
Timeline
ID reserved
By Linux
- 11 days later
· 11 days later
Published
- 2 months later
· 2 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.14% · top 97% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 4ce02c67972211be488408c275c8fbf19faf29b3 – < 48829622212f6b8f49155889aecc818ba28ba680
- affected 4ce02c67972211be488408c275c8fbf19faf29b3 – < fb4fad9105c88b1d82f1b3c39e3b6abea8249af6
- affected 4ce02c67972211be488408c275c8fbf19faf29b3 – < 7037e7bdcd26f46c080b8ce307dee5cb471c4b7c
- affected 4ce02c67972211be488408c275c8fbf19faf29b3 – < c5b6a48a8a716a7730e39af1cad083dc4ec955ce
- affected 4ce02c67972211be488408c275c8fbf19faf29b3 – < 9c7d8f7c8994c790fca501dc45ce66e7356cbe05
- affected 6.6
- unaffected < 6.6
- unaffected 6.6.153 – ≤ 6.6.*
- unaffected 6.12.101 – ≤ 6.12.*
- unaffected 6.18.42 – ≤ 6.18.*
- unaffected 7.1.6 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References5
- https://git.kernel.org/stable/c/48829622212f6b8f49155889aecc818ba28ba680 (opens in a new tab)
- https://git.kernel.org/stable/c/fb4fad9105c88b1d82f1b3c39e3b6abea8249af6 (opens in a new tab)
- https://git.kernel.org/stable/c/7037e7bdcd26f46c080b8ce307dee5cb471c4b7c (opens in a new tab)
- https://git.kernel.org/stable/c/c5b6a48a8a716a7730e39af1cad083dc4ec955ce (opens in a new tab)
- https://git.kernel.org/stable/c/9c7d8f7c8994c790fca501dc45ce66e7356cbe05 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-55529 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-68145)Record last updated .