High severity · published May 6, 2026
CVE-2026-43074
eventpoll: defer struct eventpoll free to RCU grace period
7.8
CVSS
0.5%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
6.4.1 before 6.6.136; 6.7 before 6.12.83; 6.13 before 6.18.24; 6.19 before 6.19.14; 6.4; 7.0; +6 more · source: NVD
LI
Linux · Linux
f2451def095c1743adcfcb0cb5dadc86034e162a before 902120be4f44947df6311002addc7faf69bdbff1; a1f93804449d13f97dabd4b996817de4bf1ed67a before a6d57084372161f86660bc4607784420e00efe2c; 58c9b016e12855286370dfb704c08498edbc857a before a6566cd33f6f967a7651ebf2ce0dd31572e319cf; 58c9b016e12855286370dfb704c08498edbc857a before 5b1173b165421561db29f30afc7e97d940a398a9; 58c9b016e12855286370dfb704c08498edbc857a before 7e8083f5eeedab0f460063b9c2c14c9a4e71a427; 58c9b016e12855286370dfb704c08498edbc857a before ae0bb9c1fb7c2594519aeeb096cf2c3b7837b322; +2 more · source: vendor
SS
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem · Siemens
0 · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43074
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-43074
Patch
https://git.kernel.org/stable/c/07712db80857d5d09ae08f3df85a708ecfc3b61f
Patch
https://git.kernel.org/stable/c/5b1173b165421561db29f30afc7e97d940a398a9
Patch
https://git.kernel.org/stable/c/7e8083f5eeedab0f460063b9c2c14c9a4e71a427
git.kernel.org
https://git.kernel.org/stable/c/902120be4f44947df6311002addc7faf69bdbff1
Patch
https://git.kernel.org/stable/c/a6566cd33f6f967a7651ebf2ce0dd31572e319cf
git.kernel.org
https://git.kernel.org/stable/c/a6d57084372161f86660bc4607784420e00efe2c
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