CVE-2026-46150 (GCVE-0-2026-46150)
Vulnerability from cvelistv5
Published
2026-05-28 09:36
Modified
2026-08-05 12:30
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Summary
In the Linux kernel, the following vulnerability has been resolved: fanotify: fix false positive on permission events fsnotify_get_mark_safe() may return false for a mark on an unrelated group, which results in bypassing the permission check. Fix by skipping over detached marks that are not in the current group.
References
Impacted products
Vendor Product Version
Linux Linux Version: abc77577a669f424c5d0c185b9994f2621c52aa4
Version: abc77577a669f424c5d0c185b9994f2621c52aa4
Version: abc77577a669f424c5d0c185b9994f2621c52aa4
Version: abc77577a669f424c5d0c185b9994f2621c52aa4
Version: abc77577a669f424c5d0c185b9994f2621c52aa4
Version: abc77577a669f424c5d0c185b9994f2621c52aa4
Version: abc77577a669f424c5d0c185b9994f2621c52aa4
Version: abc77577a669f424c5d0c185b9994f2621c52aa4
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/notify/fsnotify.c",
            "fs/notify/mark.c",
            "include/linux/fsnotify_backend.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a24765332e129c1916d5a6615418b75599b8fcdc",
              "status": "affected",
              "version": "abc77577a669f424c5d0c185b9994f2621c52aa4",
              "versionType": "git"
            },
            {
              "lessThan": "4a7611ad653785fcdea5ff5f4441e2b7d05b7f11",
              "status": "affected",
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "abc77577a669f424c5d0c185b9994f2621c52aa4",
              "versionType": "git"
            },
            {
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              "versionType": "git"
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/notify/fsnotify.c",
            "fs/notify/mark.c",
            "include/linux/fsnotify_backend.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.12"
            },
            {
              "lessThan": "4.12",
              "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": "6.6.140",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.88",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.30",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.258",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.209",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.175",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.140",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.88",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.30",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.7",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfanotify: fix false positive on permission events\n\nfsnotify_get_mark_safe() may return false for a mark on an unrelated group,\nwhich results in bypassing the permission check.\n\nFix by skipping over detached marks that are not in the current group."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable code runs in the context of a local file operation (open/read/exec) that triggers the fanotify permission event; the attacker bypasses the control by performing local file ops plus churning a local inotify watch. The fully-controllable, reliable attack is local (a remote file-server scenario would lose attacker control of the race).\nAC:L - The attacker controls both sides of the race \u2014 the lifecycle of the unrelated (unprivileged inotify) mark and the retried file operation \u2014 and each open() is a fresh permission event, so with unlimited retries the bypass is reliably reachable.\nPR:L - Exploitation only needs an unprivileged local account: creating an inotify watch on the parent directory and opening/executing the target file require no capabilities (the privileged CAP_SYS_ADMIN fanotify group is the victim control, not the attacker).\nUI:N - The attacker performs all actions (inotify churn plus repeated file access) with no interaction from any other user.\nS:U - The flaw and its impact are both mediated entirely within the kernel\u0027s own access-control path; no boundary to a separately-managed security authority (VM, IOMMU) is crossed.\nC:H - Bypassing FAN_ACCESS_PERM/FAN_OPEN_PERM lets read access to files the policy (AV/sandbox/EDR) would deny proceed; via targeted retries the attacker can force disclosure of chosen protected files, approaching total loss of confidentiality of protected resources.\nI:H - Bypassing FAN_OPEN_PERM/FAN_OPEN_EXEC_PERM lets writes to protected files and execution of binaries the policy would block proceed, allowing modification of protected resources and execution of disallowed code.\nA:N - The bug is fail-open (it only allows operations that should be blocked); it causes no crash, hang, or resource exhaustion, so availability is unaffected."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:30:03.577Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a24765332e129c1916d5a6615418b75599b8fcdc"
        },
        {
          "url": "https://git.kernel.org/stable/c/4a7611ad653785fcdea5ff5f4441e2b7d05b7f11"
        },
        {
          "url": "https://git.kernel.org/stable/c/04bb66be92f48ed13c3faf1139d892df228789bc"
        },
        {
          "url": "https://git.kernel.org/stable/c/895ebbedf88318607c24acc0f591c74b165e1d0a"
        },
        {
          "url": "https://git.kernel.org/stable/c/f130790f1acc8399f32652846c875a251efd040f"
        },
        {
          "url": "https://git.kernel.org/stable/c/7baa02b0ae9d17ec5f08836d8ea88ce1927d0678"
        },
        {
          "url": "https://git.kernel.org/stable/c/b7b24b28c8cd55844cab908f4f39dded638d5538"
        },
        {
          "url": "https://git.kernel.org/stable/c/7746e3bd4cc19b5092e00d32d676e329bfcb6900"
        }
      ],
      "title": "fanotify: fix false positive on permission events",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46150",
    "datePublished": "2026-05-28T09:36:06.494Z",
    "dateReserved": "2026-05-13T15:03:33.101Z",
    "dateUpdated": "2026-08-05T12:30:03.577Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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