PT-2026-37427 · Linux · Linux Kernel

Published 2026-05-06 · Updated 2026-06-01 · CVE-2026-43117

Positive Technologies (AI Summary)

CVSS v3.1

9.1

Critical

Base vector

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

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

Description A crash can occur in the Linux kernel when using overlay on top of btrfs. This happens because the btrfs sync file() function incorrectly references the superblock from the dentry, which translates to the overlay's super block instead of the btrfs super block during fsid assignment.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Related Identifiers

CVE-2026-43117

OESA-2026-2492

Affected Products

Linux Kernel

References · 39

• https://nvd.nist.gov/vuln/detail/CVE-2023-54237 · Security Note
• https://ubuntu.com/security/CVE-2026-43117 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-43040 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-43289 · Security Note
• https://git.kernel.org/stable/c/d110d7cdb045715c0b45b0dfd974525bb38f653d · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-31729 · Security Note
• https://git.kernel.org/stable/c/c09a7446aab5773f38d6abb25fce99b8e1dfbc97 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2025-40273 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-43407 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-43053 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2022-50762 · Security Note
• https://git.kernel.org/stable/c/2e4adfaec97ee053ad1bdfb5036845e66f7e0d8a · Patch
• https://cve.org/CVERecord?id=CVE-2026-43117 · Security Note
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2204-CVE-2026-43117 · Vendor Advisory
• https://git.kernel.org/stable/c/32372781d664a9b03c40343e96c29d0a6139f97d · Patch