Answer in brief
CVE-2026-52921 records a Medium severity (CVSS 5.5) vulnerability in netfilter: ipset: stop hash:* range iteration at end. 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.
CVSS is 5.5. 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 | >=48596a8ddc46f96afb6a2cd72787cb15d6bb01fc <be75218fadea22e59c8673db212f29c681bf45bb || >=48596a8ddc46f96afb6a2cd72787cb15d6bb01fc <383418c20e69f5761b6ec5238f599423f4fb77fb || >=48596a8ddc46f96afb6a2cd72787cb15d6bb01fc <0d7b33ace701fe397e6e4de145f32e098178d901 || >=48596a8ddc46f96afb6a2cd72787cb15d6bb01fc <c281e018af98df91827d65bec00f4956c00a1b02 || >=48596a8ddc46f96afb6a2cd72787cb15d6bb01fc <02f75f041a93ea045834da89cd3234f4c1d749b4 || >=48596a8ddc46f96afb6a2cd72787cb15d6bb01fc <952e988163c2ab9939c3db9f0f8e77af6a1bb436 || >=48596a8ddc46f96afb6a2cd72787cb15d6bb01fc <0b530efb2cc9dbdddfd49d392e3a857f0d4ce8dc || >=48596a8ddc46f96afb6a2cd72787cb15d6bb01fc <0d3a282ab5f165fc207ff49ea5b6ad8f54616bd6 | be75218fadea22e59c8673db212f29c681bf45bb, 383418c20e69f5761b6ec5238f599423f4fb77fb, 0d7b33ace701fe397e6e4de145f32e098178d901, c281e018af98df91827d65bec00f4956c00a1b02, 02f75f041a93ea045834da89cd3234f4c1d749b4, 952e988163c2ab9939c3db9f0f8e77af6a1bb436, 0b530efb2cc9dbdddfd49d392e3a857f0d4ce8dc, 0d3a282ab5f165fc207ff49ea5b6ad8f54616bd6 |
| Linux/Linuxgeneric | 4.14 | Not reported |
Published upstream
Jun 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 24, 2026
In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: stop hash:* range iteration at end The following hash set variants: hash:ip,mark hash:ip,port hash:ip,port,ip hash:ip,port,net iterate IPv4 ranges with a 32-bit iterator. The iterator must stop once the last address in the requested range has been processed. Advancing it once more can move the traversal state past the end of the request, so a later retry may continue from an unintended position. Handle the iterator increment explicitly at the end of the loop and stop once the upper bound has been processed. This keeps the existing retry behaviour intact for valid ranges while preventing traversal from continuing past the original boundary.
Quoted source text, attributed separately from HOL analysis.