🔐 CVE Alert

CVE-2026-93798

HIGH 7.8

btrfs: fix reloc root cleanup in merge_reloc_roots()

CVSS Score
7.8
EPSS Score
0.0%
EPSS Percentile
0th

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.

Vendor linux
Product linux
Ecosystems
Industries
Technology
Published Sep 24, 2026
Last Updated Oct 3, 2026
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CVSS v3 Breakdown

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability

Affected Versions

Linux / Linux
1dae7e0e58b484eaa43d530f211098fdeeb0f404 < 29531470b1bf1e8bd2df4941fe913106edbca615 1dae7e0e58b484eaa43d530f211098fdeeb0f404 < 415f8665a969d3c906e4fd7c90fcbb4b357886f6 1dae7e0e58b484eaa43d530f211098fdeeb0f404 < ee695a968aa73b1e67ccbf2133dc0e54381d32b2 1dae7e0e58b484eaa43d530f211098fdeeb0f404 < 0bc25f0a2d1b3e0a691431c4d7aef36afcd527c5 1dae7e0e58b484eaa43d530f211098fdeeb0f404 < ab48583aa9948205ff9a6470e23dbff74c565e24 1dae7e0e58b484eaa43d530f211098fdeeb0f404 < 63d6b1f04cd91c825329712aa526215ffa5d11ca 1dae7e0e58b484eaa43d530f211098fdeeb0f404 < b78fe9563e2d5ae47805f1e5dc722c91fd30e1f8 ee08663380ffd5a45a1c87580fbc305e8413c235 33823378ff2b510fd7b566f25bb18438aeb9b23b 5.4.54 < 5.5 5.7.11 < 5.8
Linux / Linux
5.8

References

NVD ↗ CVE.org ↗ EPSS Data ↗
git.kernel.org: https://git.kernel.org/stable/c/29531470b1bf1e8bd2df4941fe913106edbca615 git.kernel.org: https://git.kernel.org/stable/c/415f8665a969d3c906e4fd7c90fcbb4b357886f6 git.kernel.org: https://git.kernel.org/stable/c/ee695a968aa73b1e67ccbf2133dc0e54381d32b2 git.kernel.org: https://git.kernel.org/stable/c/0bc25f0a2d1b3e0a691431c4d7aef36afcd527c5 git.kernel.org: https://git.kernel.org/stable/c/ab48583aa9948205ff9a6470e23dbff74c565e24 git.kernel.org: https://git.kernel.org/stable/c/63d6b1f04cd91c825329712aa526215ffa5d11ca git.kernel.org: https://git.kernel.org/stable/c/b78fe9563e2d5ae47805f1e5dc722c91fd30e1f8