PT-2026-39095 · Linux · Linux Kernel

CVE-2026-43434 · Published 2026-05-08 · Updated 2026-05-21

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in Rust Binder where the system fails to verify ownership before using a Virtual Memory Area (VMA). When installing or zapping missing pages, Rust Binder looks up the VMA by address; however, if the VMA is closed and replaced by another at the same address, pages may be installed into the incorrect VMA. If a page is installed into a writable VMA, it allows writing to binder pages that are typically read-only, which can lead to further security complications.

Recommendations Store a pointer in vm private data and verify that the VMA returned by vma lookup() possesses the correct vm ops and vm private data before use.

Exploit

Fix

Related Identifiers

CVE-2026-43434

Affected Products

Linux Kernel

References · 17

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43434.json · Exploit
• https://ubuntu.com/security/CVE-2026-43434 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-43434 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43434 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43434 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-43434 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-43434 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-43434 · Security Note
• https://osv.dev/vulnerability/CVE-2026-43434 · Vendor Advisory
• https://git.kernel.org/stable/c/20a01f20d1f4064d90a8627aa41b5987f0220bb9 · Note
• https://git.kernel.org/linus/8ef2c15aeae07647f530d30f6daaf79eb801bcd1 · Note
• https://twitter.com/CVEnew/status/2052767636392640550 · Twitter Post
• https://git.kernel.org/stable/c/8ef2c15aeae07647f530d30f6daaf79eb801bcd1 · Note
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git · Note
• https://twitter.com/hetmehtaa/status/2055151398283837677 · Twitter Post