CVE-2026-43117 (GCVE-0-2026-43117)
Vulnerability from cvelistv5
Published
2026-05-06 07:40
Modified
2026-08-05 12:26
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
Impacted products
Vendor Product Version
Linux Linux Version: bc074524e123ded281cde25ebc5661910f9679e3
Version: bc074524e123ded281cde25ebc5661910f9679e3
Version: bc074524e123ded281cde25ebc5661910f9679e3
Version: bc074524e123ded281cde25ebc5661910f9679e3
Version: bc074524e123ded281cde25ebc5661910f9679e3
Version: bc074524e123ded281cde25ebc5661910f9679e3
Version: bc074524e123ded281cde25ebc5661910f9679e3
Version: bc074524e123ded281cde25ebc5661910f9679e3
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/trace/events/btrfs.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "bc074524e123ded281cde25ebc5661910f9679e3",
              "versionType": "git"
            },
            {
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              "versionType": "git"
            },
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        {
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.8"
            },
            {
              "lessThan": "4.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.258",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.136",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.83",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.24",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.258",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.209",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.175",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.136",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.83",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.24",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.14",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file()\n\nIf overlay is used on top of btrfs, dentry-\u003ed_sb translates to overlay\u0027s\nsuper block and fsid assignment will lead to a crash.\n\nUse file_inode(file)-\u003ei_sb to always get btrfs_sb."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
}


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