s390/vfio_ccw: Limit the number of channel program segments (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.20 % · percentile 9 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Received
Description
In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Limit the number of channel program segments The processing of channel programs, and the CCWs within them, is done recursively. As such, there is an arbitrary (but not architectural) limit to the number of CCWs that can exist in a single channel program. The vfio-ccw logic breaks these channel programs into segments whenever it encounters a Transfer-In-Channel (TIC) CCW, and the combined number of segments count towards the global limit. Impose an equivalent limit to the number of segments until such logic can be made non-recursive.
References
- https://git.kernel.org/stable/c/2ce00bb19db13606cda79f4b7aae4d9775de3096
- https://git.kernel.org/stable/c/15fb4559a7fdf0b8725e433a71cfd03a1313a48b
- https://git.kernel.org/stable/c/a1625f66eaa1200068a0e2c05bc90e65182fc4e3
- https://git.kernel.org/stable/c/06f4d6e5a8af6c2072e8cd39dbc512c683ca7fb2
- https://git.kernel.org/stable/c/4ee94790490ae8dcc97df8597f07836c8a81bbcf
- https://git.kernel.org/stable/c/5405c90d6a47b3014e74ee0618a162449abbbc93
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | CRITICAL 9.3 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H | Linux |
| CVSS 3.1 | CRITICAL 9.3 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H | NVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary) |
European references
- ENISA EUVD · EUVD-2026-66469
- GCVE · GCVE-0-2026-80554
CERT-FR advisories
- CERTFR-2026-AVI-1286 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1232 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 0a19e61e6d4c6192077ead760ba0a2d350987d4c < 2ce00bb19db13606cda79f4b7aae4d9775de3096 ; affected 0a19e61e6d4c6192077ead760ba0a2d350987d4c < 15fb4559a7fdf0b8725e433a71cfd03a1313a48b ; affected 0a19e61e6d4c6192077ead760ba0a2d350987d4c < a1625f66eaa1200068a0e2c05bc90e65182fc4e3 ; affected 0a19e61e6d4c6192077ead760ba0a2d350987d4c < 06f4d6e5a8af6c2072e8cd39dbc512c683ca7fb2 ; affected 0a19e61e6d4c6192077ead760ba0a2d350987d4c < 4ee94790490ae8dcc97df8597f07836c8a81bbcf ; affected 0a19e61e6d4c6192077ead760ba0a2d350987d4c < 5405c90d6a47b3014e74ee0618a162449abbbc93 |
| Linux · Linux | affected 4.12 ; unaffected 0 < 4.12 ; unaffected 6.1.191 ≤ 6.1.* ; unaffected 6.6.153 ≤ 6.6.* ; unaffected 6.12.105 ≤ 6.12.* ; unaffected 6.18.46 ≤ 6.18.* |
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 |