What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-06 · updated 2026-10-19
• Weakness: CWE-476

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.

Affected products

• Linux kernel: from 4.8 before 6.6.136; from 6.7 before 6.12.83; from 6.13 before 6.18.24; from 6.19 before 6.19.14; 7.0-rc1, 7.0-rc2, 7.0-rc3, 7.0-rc4, 7.0-rc5 — fixed in 6.12.83, 6.18.24, 6.19.14, 6.6.136

How to fix

Upgrade to a fixed version: Linux kernel 6.12.83, 6.18.24, 6.19.14, 6.6.136. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2e4adfaec97ee053ad1bdfb5036845e66f7e0d8a
• https://git.kernel.org/stable/c/32372781d664a9b03c40343e96c29d0a6139f97d
• https://git.kernel.org/stable/c/4a7bab35fad5251c8cb738161152578cd83b6b9c
• https://git.kernel.org/stable/c/520e8b4bcf872a534a7bf61ccf880047642df296
• https://git.kernel.org/stable/c/a85b46db143fda5869e7d8df8f258ccef5fa1719
• https://git.kernel.org/stable/c/c09a7446aab5773f38d6abb25fce99b8e1dfbc97
• https://git.kernel.org/stable/c/d110d7cdb045715c0b45b0dfd974525bb38f653d
• https://git.kernel.org/stable/c/e252db8ca2a01f82d472091f35d549b313278636
• https://cert-portal.siemens.com/productcert/html/ssa-784472.html

Get alerted when CVE-2026-43117 or the next vulnerability affects your stack