Answer in brief
CVE-2026-43074 records a High severity (CVSS 7.8) vulnerability in eventpoll: defer struct eventpoll free to RCU grace period. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (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 7.8. 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), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=f2451def095c1743adcfcb0cb5dadc86034e162a <902120be4f44947df6311002addc7faf69bdbff1 || >=a1f93804449d13f97dabd4b996817de4bf1ed67a <a6d57084372161f86660bc4607784420e00efe2c || >=58c9b016e12855286370dfb704c08498edbc857a <a6566cd33f6f967a7651ebf2ce0dd31572e319cf || >=58c9b016e12855286370dfb704c08498edbc857a <5b1173b165421561db29f30afc7e97d940a398a9 || >=58c9b016e12855286370dfb704c08498edbc857a <7e8083f5eeedab0f460063b9c2c14c9a4e71a427 || >=58c9b016e12855286370dfb704c08498edbc857a <ae0bb9c1fb7c2594519aeeb096cf2c3b7837b322 || >=58c9b016e12855286370dfb704c08498edbc857a <07712db80857d5d09ae08f3df85a708ecfc3b61f | 902120be4f44947df6311002addc7faf69bdbff1, a6d57084372161f86660bc4607784420e00efe2c, a6566cd33f6f967a7651ebf2ce0dd31572e319cf, 5b1173b165421561db29f30afc7e97d940a398a9, 7e8083f5eeedab0f460063b9c2c14c9a4e71a427, ae0bb9c1fb7c2594519aeeb096cf2c3b7837b322, 07712db80857d5d09ae08f3df85a708ecfc3b61f |
| Linux/Linuxgeneric | 6.4 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
May 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 15, 2026
In the Linux kernel, the following vulnerability has been resolved: eventpoll: defer struct eventpoll free to RCU grace period In certain situations, ep_free() in eventpoll.c will kfree the epi->ep eventpoll struct while it still being used by another concurrent thread. Defer the kfree() to an RCU callback to prevent UAF.
Quoted source text, attributed separately from HOL analysis.