CVE-2026-68098
ksmbd: bound DACL dedup walk to copied ACEs
At a glance
- Source
- NVD
- EPSS
- EPSS 0.41 % · percentile 36 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Received
Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: bound DACL dedup walk to copied ACEs set_ntacl_dacl() can stop copying ACEs before consuming the full input DACL when size accounting overflows. When that happens, num_aces reflects only the ACEs that were actually copied into the output DACL, but set_posix_acl_entries_dacl() still receives nt_num_aces and uses it to walk the existing ACE array during dedup. That makes the dedup walk scan past the copied ACE array and inspect buffer tail that does not contain valid ACEs. Split the two meanings currently carried by the NT ACE count. Pass the number of copied NT ACEs to bound the dedup walk, and preserve the original "input DACL had NT ACEs" state separately for the Everyone/default ACL fallback. This keeps the dedup walk aligned with the ACEs that are actually present in the rebuilt DACL.
Weaknesses (CWE)
- CWE-125 — Out-of-bounds Read
References
- https://git.kernel.org/stable/c/6d9d7aa4a2c99c31acfa28921c30b684110cf66c
- https://git.kernel.org/stable/c/b057a851129c6a084e7e393b62ca3abf6c2660bc
- https://git.kernel.org/stable/c/f1eba60db813ec28732bf18b5f0a67ebac9c3100
- https://git.kernel.org/stable/c/a0ebdaa79e10210d4e8ed9fe138e8f4d569719e3
- https://git.kernel.org/stable/c/58d97fcd0bf1aee694e244cc28635b9df95b543b
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | Linux |
| CVSS 3.1 | HIGH 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary) |
European references
- ENISA EUVD · EUVD-2026-55479
- GCVE · GCVE-0-2026-68098
CERT-FR advisories
- CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1333 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1286 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1069 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 6d9d7aa4a2c99c31acfa28921c30b684110cf66c ; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < b057a851129c6a084e7e393b62ca3abf6c2660bc ; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < f1eba60db813ec28732bf18b5f0a67ebac9c3100 ; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < a0ebdaa79e10210d4e8ed9fe138e8f4d569719e3 ; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 58d97fcd0bf1aee694e244cc28635b9df95b543b |
| Linux · Linux | affected 5.15 ; unaffected 0 < 5.15 ; unaffected 6.6.148 ≤ 6.6.* ; unaffected 6.12.101 ≤ 6.12.* ; unaffected 6.18.42 ≤ 6.18.* ; unaffected 7.1.6 ≤ 7.1.* |
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 |