Vulnerability details
CVE-2026-43074
Linux LinuxSiemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
eventpoll: defer struct eventpoll free to RCU grace period
CVSS 3.1
7.8High
Official description
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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.8High | 3.1 | CVEProject cvelistV5 (CNA) (Linux) | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Linux | Linux | 6.4 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 58c9b016e12855286370dfb704c08498edbc857a ≤ v < a6566cd33f6f967a7651ebf2ce0dd31572e319cf | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 58c9b016e12855286370dfb704c08498edbc857a ≤ v < 5b1173b165421561db29f30afc7e97d940a398a9 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 58c9b016e12855286370dfb704c08498edbc857a ≤ v < 07712db80857d5d09ae08f3df85a708ecfc3b61f | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 58c9b016e12855286370dfb704c08498edbc857a ≤ v < 7e8083f5eeedab0f460063b9c2c14c9a4e71a427 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 58c9b016e12855286370dfb704c08498edbc857a ≤ v < ae0bb9c1fb7c2594519aeeb096cf2c3b7837b322 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | a1f93804449d13f97dabd4b996817de4bf1ed67a ≤ v < a6d57084372161f86660bc4607784420e00efe2c | CVEProject cvelistV5 (CNA) |
| Linux | Linux | f2451def095c1743adcfcb0cb5dadc86034e162a ≤ v < 902120be4f44947df6311002addc7faf69bdbff1 | CVEProject cvelistV5 (CNA) |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem | All | CVEProject cvelistV5 (CNA) |
References and advisories
8- https://git.kernel.org/stable/c/902120be4f44947df6311002addc7faf69bdbff1
- https://git.kernel.org/stable/c/a6d57084372161f86660bc4607784420e00efe2c
- https://git.kernel.org/stable/c/a6566cd33f6f967a7651ebf2ce0dd31572e319cf
- https://git.kernel.org/stable/c/5b1173b165421561db29f30afc7e97d940a398a9
- https://git.kernel.org/stable/c/7e8083f5eeedab0f460063b9c2c14c9a4e71a427
- https://git.kernel.org/stable/c/ae0bb9c1fb7c2594519aeeb096cf2c3b7837b322
- https://git.kernel.org/stable/c/07712db80857d5d09ae08f3df85a708ecfc3b61f
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
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Details
- Published
- 2026-05-06
- Last updated
- 2026-10-19
- State
- Published
- Assigner (CNA)
- Linux
Exploit prediction (EPSS)
0.48%
Probability of exploitation in 30 days
41.8%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-416Use After Free