CVE-2026-93798

CVE CVE-2026-93798EUVD EUVD-2026-86185Published 2026-09-24T16:02:31.000ZLast changed 2026-09-25T12:43:04.000ZCVSS 7.8

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 5.7.11 <5.8; ee08663380ffd5a45a1c87580fbc305e8413c235; 1dae7e0e58b484eaa43d530f211098fdeeb0f404 <63d6b1f04cd91c825329712aa526215ffa5d11ca; 1dae7e0e58b484eaa43d530f211098fdeeb0f404 <ab48583aa9948205ff9a6470e23dbff74c565e24; 33823378ff2b510fd7b566f25bb18438aeb9b23b; patch: 7.2; patch: 6.12.111; patch: 6.18.53; 5.8; 5.4.54 <5.5; 1dae7e0e58b484eaa43d530f211098fdeeb0f404 <b78fe9563e2d5ae47805f1e5dc722c91fd30e1f8; patch: 0

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

Linux — Linux

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