Vulnerability-Lookup

FKIE_CVE-2023-53618

Vulnerability from fkie_nvd - Published: 2025-10-07 16:15 - Updated: 2026-02-05 14:58

Severity ?

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/314135b7bae9618a317874ae195272682cf2d5d4	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3ae93b316ca4b8b3c33798ef1d210355f2fb9318	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6ebcd021c92b8e4b904552e4d87283032100796d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/84256e00eeca73c529fc6196e478cc89b8098157	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.5
linux	linux_kernel	6.5
linux	linux_kernel	6.5
linux	linux_kernel	6.5
linux	linux_kernel	6.5

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "versionEndExcluding": "5.3",
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: reject invalid reloc tree root keys with stack dump\n\n[BUG]\nSyzbot reported a crash that an ASSERT() got triggered inside\nprepare_to_merge().\n\nThat ASSERT() makes sure the reloc tree is properly pointed back by its\nsubvolume tree.\n\n[CAUSE]\nAfter more debugging output, it turns out we had an invalid reloc tree:\n\n  BTRFS error (device loop1): reloc tree mismatch, root 8 has no reloc root, expect reloc root key (-8, 132, 8) gen 17\n\nNote the above root key is (TREE_RELOC_OBJECTID, ROOT_ITEM,\nQUOTA_TREE_OBJECTID), meaning it\u0027s a reloc tree for quota tree.\n\nBut reloc trees can only exist for subvolumes, as for non-subvolume\ntrees, we just COW the involved tree block, no need to create a reloc\ntree since those tree blocks won\u0027t be shared with other trees.\n\nOnly subvolumes tree can share tree blocks with other trees (thus they\nhave BTRFS_ROOT_SHAREABLE flag).\n\nThus this new debug output proves my previous assumption that corrupted\non-disk data can trigger that ASSERT().\n\n[FIX]\nBesides the dedicated fix and the graceful exit, also let tree-checker to\ncheck such root keys, to make sure reloc trees can only exist for subvolumes."
    }
  ],
  "id": "CVE-2023-53618",
  "lastModified": "2026-02-05T14:58:43.870",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-10-07T16:15:44.297",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "value": "NVD-CWE-noinfo"
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      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2025-10-07 15:19 – Updated: 2026-01-05 10:21

Title

btrfs: reject invalid reloc tree root keys with stack dump

Summary

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/314135b7bae9618a3…
	https://git.kernel.org/stable/c/3ae93b316ca4b8b3c…
	https://git.kernel.org/stable/c/84256e00eeca73c52…
	https://git.kernel.org/stable/c/6ebcd021c92b8e4b9…

Impacted products

Vendor

Product

Version

Linux

Affected: 259ee7754b6793af8bdd77f9ca818bc41cfe9541 , < 314135b7bae9618a317874ae195272682cf2d5d4 (git)
Affected: 259ee7754b6793af8bdd77f9ca818bc41cfe9541 , < 3ae93b316ca4b8b3c33798ef1d210355f2fb9318 (git)
Affected: 259ee7754b6793af8bdd77f9ca818bc41cfe9541 , < 84256e00eeca73c529fc6196e478cc89b8098157 (git)
Affected: 259ee7754b6793af8bdd77f9ca818bc41cfe9541 , < 6ebcd021c92b8e4b904552e4d87283032100796d (git)
Affected: 3d95c52d789ca99e344061d7f6dadb2519adbcf5 (git)
Affected: fba904d68c8bbfcc89c2210cfcb2351be90bc3e5 (git)

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)

Show details on NVD website

JSON

To clipboard

{
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/disk-io.c",
            "fs/btrfs/tree-checker.c"
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            },
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          "product": "Linux",
          "programFiles": [
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            "fs/btrfs/tree-checker.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "version": "5.4"
            },
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    "datePublished": "2025-10-07T15:19:25.303Z",
    "dateReserved": "2025-10-07T15:16:59.655Z",
    "dateUpdated": "2026-01-05T10:21:34.482Z",
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}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2023-53618

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

Tags

Sightings

Nomenclature