Use After Free in Linux
CVE-2026-23432
In the Linux kernel, the following vulnerability has been resolved: mshv: Fix use-after-free in mshv_map_user_memory error path In the error path of mshv_map_user_memory(), calling vfree() directly on the region leaves the MMU notifier registered. When userspace later unmaps the memory, the notifier fires and accesses the freed region, causing a use-after-free and potential kernel panic. Replace vfree() with mshv_partition_put() to properly unregister the MMU notifier before freeing the region.
Vulnerability class: Use-After-Free
EPSS: 0.001 (2.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Linux — versions b9a66cd5ccbb9fade15d0e427e19470d8ad35b75, 6.19, 0
- Linux Linux_kernel — versions 6.19, 7.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-23432?
- CVE-2026-23432 is a high-severity vulnerability in Linux, classified under Use After Free. CVSS score: 7.8/10. Published 2026-04-03.
- How severe is CVE-2026-23432?
- High severity. CVSS v3 base score is 7.8 out of 10.