CVE-2026-43117 btrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file()

What is CVE-2026-43117?

CVE-2026-43117 is a critical vulnerability in Linux kernel, published on 6 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

btrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file()

If overlay is used on top of btrfs, dentry->d_sb translates to overlay's super block and fsid assignment will lead to a crash.

Use file_inode(file)->i_sb to always get btrfs_sb.

Weakness: CWE-476

Which versions are affected by CVE-2026-43117?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-43117?

Apply the vendor's patch.

Is CVE-2026-43117 being exploited?

There is no known exploitation of CVE-2026-43117 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2026-43117, DEBIAN-CVE-2026-43117, GHSA-8r24-mq27-r6cw, ROOT-OS-DEBIAN-11-CVE-2026-43117, ROOT-OS-DEBIAN-12-CVE-2026-43117, ROOT-OS-UBUNTU-2204-CVE-2026-43117 and 2 more.