Answer in brief
CVE-2026-43403 records a Unknown severity vulnerability in nsfs: tighten permission checks for ns iteration ioctls. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=a1d220d9dafa8d76ba60a784a1016c3134e6a1e8 <3376b345df155ca36d8611857b41ff7d5183fc38 || >=a1d220d9dafa8d76ba60a784a1016c3134e6a1e8 <2f3dea284c761c890d676f77d5e55c0c496b4ef4 || >=a1d220d9dafa8d76ba60a784a1016c3134e6a1e8 <0ad650e60150eda789deca5e78a6a09d26bf8fc9 || >=a1d220d9dafa8d76ba60a784a1016c3134e6a1e8 <e6b899f08066e744f89df16ceb782e06868bd148 | 3376b345df155ca36d8611857b41ff7d5183fc38, 2f3dea284c761c890d676f77d5e55c0c496b4ef4, 0ad650e60150eda789deca5e78a6a09d26bf8fc9, e6b899f08066e744f89df16ceb782e06868bd148 |
| Linux/Linuxgeneric | 6.12 | Not reported |
Published upstream
May 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-43403 records a Unknown severity vulnerability in nsfs: tighten permission checks for ns iteration ioctls. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=a1d220d9dafa8d76ba60a784a1016c3134e6a1e8 <3376b345df155ca36d8611857b41ff7d5183fc38 || >=a1d220d9dafa8d76ba60a784a1016c3134e6a1e8 <2f3dea284c761c890d676f77d5e55c0c496b4ef4 || >=a1d220d9dafa8d76ba60a784a1016c3134e6a1e8 <0ad650e60150eda789deca5e78a6a09d26bf8fc9 || >=a1d220d9dafa8d76ba60a784a1016c3134e6a1e8 <e6b899f08066e744f89df16ceb782e06868bd148 | 3376b345df155ca36d8611857b41ff7d5183fc38, 2f3dea284c761c890d676f77d5e55c0c496b4ef4, 0ad650e60150eda789deca5e78a6a09d26bf8fc9, e6b899f08066e744f89df16ceb782e06868bd148 |
| Linux/Linuxgeneric | 6.12 | Not reported |
Published upstream
May 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.