cifs: fix loff_t underflow in cifs_remap_file_range() when len == 0 (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.13 % · percentile 2 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Received
Description
In the Linux kernel, the following vulnerability has been resolved: cifs: fix loff_t underflow in cifs_remap_file_range() when len == 0 With len == 0 (clone to EOF), the effective length is computed as: len = src_inode->i_size - off; If off > i_size, this is a negative loff_t, corrupting the ByteCount in the FSCTL_DUPLICATE_EXTENTS_TO_FILE request and inverting the range in filemap_write_and_wait_range(). The existing off >= i_size check fires only after the ioctl has already been sent. Snapshot i_size_read() once for both the bounds check and the length calculation, eliminating the TOCTOU and 32-bit torn-read risk. Reject off > src_size with -EINVAL. Treat off == src_size as a no-op, consistent with __generic_remap_file_range_prep().
References
- https://git.kernel.org/stable/c/2c6eede83b3de1268db92c7e49741761c954aa26
- https://git.kernel.org/stable/c/ce813e5eebf46851e872ce59bdc34dc5dd4e29a4
- https://git.kernel.org/stable/c/f3d1ae1e6bc4a9f559185b6e7bd2b6375ec2fdd4
- https://git.kernel.org/stable/c/7f62817fe049b0f3652518c1ba72631ec1e0a322
- https://git.kernel.org/stable/c/b098f5e5858797827666e6cd73033f52fc39b5f6
- https://git.kernel.org/stable/c/c2a0dcb5a7a1516aa6eb6d5cedca6a8e76527028
- https://git.kernel.org/stable/c/b057ca17b656345d04669cb87f2aff9b31d873db
- https://git.kernel.org/stable/c/6c322f5cf7476ded7a9a20f7be72462065a03c68
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H | Linux |
| CVSS 3.1 | HIGH 7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H | NVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary) |
European references
- ENISA EUVD · EUVD-2026-76552
- GCVE · GCVE-0-2026-89640
CERT-FR advisories
- CERTFR-2026-AVI-1432 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1375 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1289 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1253 — Multiples vulnérabilités dans le noyau Linux de Debian · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 04b38d601239b4d9be641b412cf4b7456a041c67 < 2c6eede83b3de1268db92c7e49741761c954aa26 ; affected 04b38d601239b4d9be641b412cf4b7456a041c67 < ce813e5eebf46851e872ce59bdc34dc5dd4e29a4 ; affected 04b38d601239b4d9be641b412cf4b7456a041c67 < f3d1ae1e6bc4a9f559185b6e7bd2b6375ec2fdd4 ; affected 04b38d601239b4d9be641b412cf4b7456a041c67 < 7f62817fe049b0f3652518c1ba72631ec1e0a322 ; affected 04b38d601239b4d9be641b412cf4b7456a041c67 < b098f5e5858797827666e6cd73033f52fc39b5f6 ; affected 04b38d601239b4d9be641b412cf4b7456a041c67 < c2a0dcb5a7a1516aa6eb6d5cedca6a8e76527028 |
| Linux · Linux | affected 4.5 ; unaffected 0 < 4.5 ; unaffected 5.10.273 ≤ 5.10.* ; unaffected 5.15.224 ≤ 5.15.* ; unaffected 6.1.188 ≤ 6.1.* ; unaffected 6.6.157 ≤ 6.6.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |