Vulnerability-Lookup

FKIE_CVE-2026-43117

Vulnerability from fkie_nvd - Published: 2026-05-06 10:16 - Updated: 2026-06-17 10:48

Severity

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

Summary

In the Linux kernel, the following vulnerability has been resolved: btrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file() If overlay is used on top of btrfs, dentry->d_sb translates to overlay's super block and fsid assignment will lead to a crash. Use file_inode(file)->i_sb to always get btrfs_sb.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2e4adfaec97ee053ad1bdfb5036845e66f7e0d8a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/32372781d664a9b03c40343e96c29d0a6139f97d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4a7bab35fad5251c8cb738161152578cd83b6b9c
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/520e8b4bcf872a534a7bf61ccf880047642df296
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a85b46db143fda5869e7d8df8f258ccef5fa1719	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c09a7446aab5773f38d6abb25fce99b8e1dfbc97	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d110d7cdb045715c0b45b0dfd974525bb38f653d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e252db8ca2a01f82d472091f35d549b313278636

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

{
  "affected": [
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      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/trace/events/btrfs.h"
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    }
  ],
  "id": "CVE-2026-43117",
  "lastModified": "2026-06-17T10:48:58.083",
  "metrics": {
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
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        "type": "Secondary"
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  "published": "2026-05-06T10:16:25.513",
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  "vulnStatus": "Modified",
  "weaknesses": [
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          "value": "NVD-CWE-noinfo"
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      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2026-43117 (GCVE-0-2026-43117)

Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-08-05 12:26

Title

btrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file()

Summary

Severity

9.1 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/4a7bab35fad5251c8…
https://git.kernel.org/stable/c/520e8b4bcf872a534…
https://git.kernel.org/stable/c/e252db8ca2a01f82d…
https://git.kernel.org/stable/c/c09a7446aab5773f3…
https://git.kernel.org/stable/c/32372781d664a9b03…
https://git.kernel.org/stable/c/2e4adfaec97ee053a…
https://git.kernel.org/stable/c/d110d7cdb045715c0…
https://git.kernel.org/stable/c/a85b46db143fda586…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: bc074524e123ded281cde25ebc5661910f9679e3 , < 4a7bab35fad5251c8cb738161152578cd83b6b9c (git) Affected: bc074524e123ded281cde25ebc5661910f9679e3 , < 520e8b4bcf872a534a7bf61ccf880047642df296 (git) Affected: bc074524e123ded281cde25ebc5661910f9679e3 , < e252db8ca2a01f82d472091f35d549b313278636 (git) Affected: bc074524e123ded281cde25ebc5661910f9679e3 , < c09a7446aab5773f38d6abb25fce99b8e1dfbc97 (git) Affected: bc074524e123ded281cde25ebc5661910f9679e3 , < 32372781d664a9b03c40343e96c29d0a6139f97d (git) Affected: bc074524e123ded281cde25ebc5661910f9679e3 , < 2e4adfaec97ee053ad1bdfb5036845e66f7e0d8a (git) Affected: bc074524e123ded281cde25ebc5661910f9679e3 , < d110d7cdb045715c0b45b0dfd974525bb38f653d (git) Affected: bc074524e123ded281cde25ebc5661910f9679e3 , < a85b46db143fda5869e7d8df8f258ccef5fa1719 (git)
Linux	Linux	Affected: 4.8 Unaffected: 0 , < 4.8 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.136 , ≤ 6.6.* (semver) Unaffected: 6.12.83 , ≤ 6.12.* (semver) Unaffected: 6.18.24 , ≤ 6.18.* (semver) Unaffected: 6.19.14 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/trace/events/btrfs.h"
          ],
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            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable tracepoint is reachable through fsync/flush paths, and a severe reasonable deployment is an NFS/ksmbd-exported overlay filesystem backed by btrfs where a remote client can issue COMMIT/FLUSH into btrfs_sync_file(). Local fsync paths also reach it, but the network file-server path is the highest reasonable vector.\nAC:L - Once the btrfs_sync_file tracepoint/perf event is active, triggering the bug is a deterministic fsync/flush on an overlay-backed btrfs file with no race or timing requirement. Overlay-on-btrfs is a normal supported configuration.\nPR:N - A remote client can plausibly reach the fsync path through a guest or writable NFS/SMB export without privileges on the vulnerable host. When uncertain, the higher severity no-privilege scenario is defensible.\nUI:N - No victim action is needed after the filesystem/export/tracing environment exists; the attacker only sends or performs the fsync/flush operation. Mounting or tracing setup is environmental, not per-exploit user interaction.\nS:U - The impact is within the same kernel security authority and does not cross a hypervisor, IOMMU, or sandbox boundary. Standard kernel crash or kernel-memory exposure remains scope unchanged.\nC:H - The bug type-confuses an overlay superblock as btrfs_fs_info and copies through the bogus fs_devices pointer into trace/perf data. If the pointer resolves to valid kernel memory, this can expose kernel memory, so the higher severity confidentiality impact is selected.\nI:N - The vulnerable operations are invalid reads and writes only to the trace record buffer, not attacker-controlled writes to kernel objects. No direct integrity modification or control-flow overwrite was found.\nA:H - The fix commit explicitly states the bad fsid assignment can crash, and the invalid superblock/fs_devices dereference can oops or panic the kernel. This is high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:26:03.902Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4a7bab35fad5251c8cb738161152578cd83b6b9c"
        },
        {
          "url": "https://git.kernel.org/stable/c/520e8b4bcf872a534a7bf61ccf880047642df296"
        },
        {
          "url": "https://git.kernel.org/stable/c/e252db8ca2a01f82d472091f35d549b313278636"
        },
        {
          "url": "https://git.kernel.org/stable/c/c09a7446aab5773f38d6abb25fce99b8e1dfbc97"
        },
        {
          "url": "https://git.kernel.org/stable/c/32372781d664a9b03c40343e96c29d0a6139f97d"
        },
        {
          "url": "https://git.kernel.org/stable/c/2e4adfaec97ee053ad1bdfb5036845e66f7e0d8a"
        },
        {
          "url": "https://git.kernel.org/stable/c/d110d7cdb045715c0b45b0dfd974525bb38f653d"
        },
        {
          "url": "https://git.kernel.org/stable/c/a85b46db143fda5869e7d8df8f258ccef5fa1719"
        }
      ],
      "title": "btrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43117",
    "datePublished": "2026-05-06T07:40:41.862Z",
    "dateReserved": "2026-05-01T14:12:55.987Z",
    "dateUpdated": "2026-08-05T12:26:03.902Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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FKIE_CVE-2026-43117

CVE-2026-43117 (GCVE-0-2026-43117)

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Sightings

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