CVE-2026-40216 · Package
NO FIX YET · SEE WHAT TO DO
Hyperscan, Intel's regular expression matching library, has an out-of-bounds read in versions before v5.4.2.1 when run in user space. A local user with an account can trigger it to cause a denial of service.
first public Nov 10, 2026 · 1 source
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Applications that embed Hyperscan in user space and run it on machines where untrusted local users have accounts are the ones exposed. The sources do not describe a network-facing trigger, and systems without local untrusted users are less exposed.
Not affected if hyperscan-v5.4.2.1-or-later, no-local-untrusted-users
Who cares hyperscan, intel, local-users
v5.4.2.1 or later.Out-of-bounds read for some Hyperscan before version v5.4.2.1 within Ring 3: User Applications may allow a denial of service. Unprivileged software adversary with an authenticated user combined with a low complexity attack may enable denial of service. This result may potentially occur via local access when attack requirements are not present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (low), integrity (none) and availability (low) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.
This page as .md · .json · CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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