{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-93798",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-93798"
  ],
  "published": "2026-09-24T16:08:25Z",
  "summary": "btrfs: fix reloc root cleanup in merge_reloc_roots()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix reloc root cleanup in merge_reloc_roots()\n\nIf the root we got has zero root refs in its root item, we are resetting\nthe root's ->reloc_root without using barriers like we do everywhere else.\nSashiko complained about this while reviewing another patch, and it's\ncorrect (see the Link tag below).\n\nAlso, we should not clear BTRFS_ROOT_DEAD_RELOC_TREE from the root unless\nthe root points to the reloc root we have.\n\nFix this by using clear_reloc_root(), which issues the memory barrier\nafter setting the root's ->reloc_root to NULL and before clearing the bit\nBTRFS_ROOT_DEAD_RELOC_TREE from the root.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-93798"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/29531470b1bf1e8bd2df4941fe913106edbca615"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/415f8665a969d3c906e4fd7c90fcbb4b357886f6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ee695a968aa73b1e67ccbf2133dc0e54381d32b2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0bc25f0a2d1b3e0a691431c4d7aef36afcd527c5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ab48583aa9948205ff9a6470e23dbff74c565e24"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/63d6b1f04cd91c825329712aa526215ffa5d11ca"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b78fe9563e2d5ae47805f1e5dc722c91fd30e1f8"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-03T11:04:09Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - merge_reloc_roots() is reached from local VFS activity: unlink/write call btrfs_update_block_group() which btrfs_mark_bg_to_reclaim(); btrfs_reclaim_bgs_work() then runs btrfs_relocate_chunk()->btrfs_relocate_block_group()->relocate_block_group()->prepare_to_merge()->merge_reloc_roots(). No network protocol supplies the causing state.\nAC:L - When relocate_block_group() fails (the attacker can force ENOSPC via extra allocations), prepare_to_merge() leaves reloc roots at 0 refs and merge_reloc_roots() NULLs root->reloc_root then clear_bit(BTRFS_ROOT_DEAD_RELOC_TREE) without smp_wmb(). Concurrent writes invoke btrfs_init_reloc_root()/have_reloc_root() on that same root, so the attacker drives both sides.\nPR:L - BTRFS_IOC_BALANCE requires capable(CAP_SYS_ADMIN), but btrfs_buffered_write() and unlink used to mark a block group reclaimable have no capability gate. btrfs_fs_type lacks FS_USERNS_MOUNT, so the volume is admin-mounted, yet any unprivileged uid with write permission on that mount can induce reclaim into merge_reloc_roots().\nUI:N - The attacker induces the 0-ref merge_reloc_roots() cleanup with their own writes and deletions on a btrfs they can already write, then races have_reloc_root() with further writes or btrfs_ioctl_snap_create(); no second user needs to mount an image or run balance.\nS:U - The use-after-free is of the struct btrfs_root stored in fs_root->reloc_root inside the same host kernel that mounted the volume; merge_reloc_roots() does not cross a VM, IOMMU, or sandbox authority.\nC:H - Missing smp_wmb() in merge_reloc_roots() lets have_reloc_root() see BTRFS_ROOT_DEAD_RELOC_TREE already clear while still loading the old root->reloc_root pointer; btrfs_should_ignore_reloc_root() then reads reloc_root->commit_root after the matching btrfs_put_root() dropped that reloc root.\nI:H - The same stale reloc_root is written by btrfs_init_reloc_root() via btrfs_set_root_last_trans() and by commit_fs_roots()->btrfs_update_reloc_root() which mutates reloc_root->root_item, giving a write-after-free of struct btrfs_root.\nA:H - Using the dangling reloc_root after merge_reloc_roots()'s btrfs_put_root() oopses; if clear_bit(BTRFS_ROOT_DEAD_RELOC_TREE) becomes visible while the pointer still refers to the 0-ref tree, btrfs_reloc_pre_snapshot() hits BUG_ON(btrfs_root_refs(&root->root_item)==0)."
    }
  }
}