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CVE-2023-53618 (GCVE-0-2023-53618)

Vulnerability from cvelistv5 – Published: 2025-10-07 15:19 – Updated: 2026-05-23 15:30
VLAI
Title
btrfs: reject invalid reloc tree root keys with stack dump
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: reject invalid reloc tree root keys with stack dump [BUG] Syzbot reported a crash that an ASSERT() got triggered inside prepare_to_merge(). That ASSERT() makes sure the reloc tree is properly pointed back by its subvolume tree. [CAUSE] After more debugging output, it turns out we had an invalid reloc tree: BTRFS error (device loop1): reloc tree mismatch, root 8 has no reloc root, expect reloc root key (-8, 132, 8) gen 17 Note the above root key is (TREE_RELOC_OBJECTID, ROOT_ITEM, QUOTA_TREE_OBJECTID), meaning it's a reloc tree for quota tree. But reloc trees can only exist for subvolumes, as for non-subvolume trees, we just COW the involved tree block, no need to create a reloc tree since those tree blocks won't be shared with other trees. Only subvolumes tree can share tree blocks with other trees (thus they have BTRFS_ROOT_SHAREABLE flag). Thus this new debug output proves my previous assumption that corrupted on-disk data can trigger that ASSERT(). [FIX] Besides the dedicated fix and the graceful exit, also let tree-checker to check such root keys, to make sure reloc trees can only exist for subvolumes.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 259ee7754b6793af8bdd77f9ca818bc41cfe9541 , < 314135b7bae9618a317874ae195272682cf2d5d4 (git)
Affected: 259ee7754b6793af8bdd77f9ca818bc41cfe9541 , < 3ae93b316ca4b8b3c33798ef1d210355f2fb9318 (git)
Affected: 259ee7754b6793af8bdd77f9ca818bc41cfe9541 , < 84256e00eeca73c529fc6196e478cc89b8098157 (git)
Affected: 259ee7754b6793af8bdd77f9ca818bc41cfe9541 , < 6ebcd021c92b8e4b904552e4d87283032100796d (git)
Affected: 3d95c52d789ca99e344061d7f6dadb2519adbcf5 (git)
Affected: fba904d68c8bbfcc89c2210cfcb2351be90bc3e5 (git)
Affected: 5.2.19 , < 5.3 (semver)
Affected: 5.3.4 , < 5.4 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.15.127 , ≤ 5.15.* (semver)
Unaffected: 6.1.46 , ≤ 6.1.* (semver)
Unaffected: 6.4.11 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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      "product_status:known_affected": "42",
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      "title": "kernel: btrfs: reject invalid reloc tree root keys with stack dump",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53618.json",
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}



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