Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix reloc root cleanup in merge_reloc_roots() If the root we got has zero root refs in its root item, we are resetting the root's ->reloc_root without using barriers like we do everywhere else. Sashiko complained about this while reviewing another patch, and it's correct (see the Link tag below). Also, we should not clear BTRFS_ROOT_DEAD_RELOC_TREE from the root unless the root points to the reloc root we have. Fix this by using clear_reloc_root(), which issues the memory barrier after setting the root's ->reloc_root to NULL and before clearing the bit BTRFS_ROOT_DEAD_RELOC_TREE from the root.
CVSS Score
HIGH
References
- https://git.kernel.org/stable/c/0bc25f0a2d1b3e0a691431c4d7aef36afcd527c5
- https://git.kernel.org/stable/c/29531470b1bf1e8bd2df4941fe913106edbca615
- https://git.kernel.org/stable/c/415f8665a969d3c906e4fd7c90fcbb4b357886f6
- https://git.kernel.org/stable/c/63d6b1f04cd91c825329712aa526215ffa5d11ca
- https://git.kernel.org/stable/c/ab48583aa9948205ff9a6470e23dbff74c565e24
- https://git.kernel.org/stable/c/b78fe9563e2d5ae47805f1e5dc722c91fd30e1f8
- https://git.kernel.org/stable/c/ee695a968aa73b1e67ccbf2133dc0e54381d32b2
FAQ
What is CVE-2026-93798?
CVE-2026-93798 is a vulnerability with a CVSS score of 7.8 (HIGH). In the Linux kernel, the following vulnerability has been resolved: btrfs: fix reloc root cleanup in merge_reloc_roots() If the root we got has zero root refs in its root item, we are resetting the ...
How severe is CVE-2026-93798?
CVE-2026-93798 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-93798?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.