Answer in brief
CVE-2026-72436 records a Critical severity (CVSS 9.8) vulnerability in netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types. 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 9.8. 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 | >=18f84d41d34fa35d0d64bbaea01fe664553ecc06 <c107233d2ff4fd7cef5d02f9124b99194957a710 || >=18f84d41d34fa35d0d64bbaea01fe664553ecc06 <6329d3a9afe715fddda0460cfa46b496d61c2fe0 || >=18f84d41d34fa35d0d64bbaea01fe664553ecc06 <7445fe965b7d8756070a40e80f8b73348ccda1d7 || >=18f84d41d34fa35d0d64bbaea01fe664553ecc06 <c4d257734e91bfcdc71d41843392dd6400b5bb1b || >=18f84d41d34fa35d0d64bbaea01fe664553ecc06 <3219d74e4536658c937fd878a327257b86ce80dd || >=18f84d41d34fa35d0d64bbaea01fe664553ecc06 <e4b4984e28c16406ecb318444dea4a8bf47def3e | c107233d2ff4fd7cef5d02f9124b99194957a710, 6329d3a9afe715fddda0460cfa46b496d61c2fe0, 7445fe965b7d8756070a40e80f8b73348ccda1d7, c4d257734e91bfcdc71d41843392dd6400b5bb1b, 3219d74e4536658c937fd878a327257b86ce80dd, e4b4984e28c16406ecb318444dea4a8bf47def3e |
| Linux/Linuxgeneric | 4.2 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types Sashiko pointed out that there are a few lockless RCU readers using test_bit() which is a relaxed atomic operation and provides no memory barrier guarantees. Use test_bit_acquire() instead where the operation may run parallel with add/del/gc, i.e. is not one from the next cases - protected by region lock - in a set destroy phase - in a new/temporary set creation phase
Quoted source text, attributed separately from HOL analysis.