CVE-2026-43403
Description
In the Linux kernel, the following vulnerability has been resolved: nsfs: tighten permission checks for ns iteration ioctls Even privileged services should not necessarily be able to see other privileged service's namespaces so they can't leak information to each other. Use may_see_all_namespaces() helper that centralizes this policy until the nstree adapts.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2026-43403
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2026-43403.html
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/e6b899f08066e744f89df16ceb782e06868bd148
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/3376b345df155ca36d8611857b41ff7d5183fc38
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/2f3dea284c761c890d676f77d5e55c0c496b4ef4
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/0ad650e60150eda789deca5e78a6a09d26bf8fc9
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 0 |
| debian | bullseye | fixed | 0 |
| debian | forky | fixed | 6.19.10-1 |
| debian | sid | fixed | 6.19.10-1 |
| debian | trixie | fixed | 6.12.85-1 |
| linux-kernel | affected | 6.12.78 | |
| linux-kernel | 7.0 | affected | |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| gcp | | |
References
- https://git.kernel.org/stable/c/0ad650e60150eda789deca5e78a6a09d26bf8fc9
- https://git.kernel.org/stable/c/2f3dea284c761c890d676f77d5e55c0c496b4ef4
- https://git.kernel.org/stable/c/3376b345df155ca36d8611857b41ff7d5183fc38
- https://git.kernel.org/stable/c/e6b899f08066e744f89df16ceb782e06868bd148
- https://www.suse.com/security/cve/CVE-2026-43403.html
- https://security-tracker.debian.org/tracker/CVE-2026-43403
Verify integrity in audit chain (admin only). AS-IS.