Answer in brief
CVE-2026-43391 records a Unknown severity vulnerability in nsfs: tighten permission checks for handle opening. 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 | >=5222470b2fbb3740f931f189db33dd1367b1ae75 <1797ee11451f1b2be69863a9f5bd43b948813fdf || >=5222470b2fbb3740f931f189db33dd1367b1ae75 <d2324a9317f00013facb0ba00b00440e19d2af5e | 1797ee11451f1b2be69863a9f5bd43b948813fdf, d2324a9317f00013facb0ba00b00440e19d2af5e |
| Linux/Linuxgeneric | 6.18 | 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 handle opening 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-2026-43391 records a Unknown severity vulnerability in nsfs: tighten permission checks for handle opening. 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 | >=5222470b2fbb3740f931f189db33dd1367b1ae75 <1797ee11451f1b2be69863a9f5bd43b948813fdf || >=5222470b2fbb3740f931f189db33dd1367b1ae75 <d2324a9317f00013facb0ba00b00440e19d2af5e | 1797ee11451f1b2be69863a9f5bd43b948813fdf, d2324a9317f00013facb0ba00b00440e19d2af5e |
| Linux/Linuxgeneric | 6.18 | 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 handle opening 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.