Vulnerability-Lookup

GHSA-5CG4-H7FF-5XR5

Vulnerability from github – Published: 2026-10-23 15:31 – Updated: 2026-10-23 15:31

Details

In the Linux kernel, the following vulnerability has been resolved:

perf/core: Check kernel access when kernel callchains are requested

perf_event_open() currently gates perf_allow_kernel() only on !attr.exclude_kernel.

However, users can still request kernel callchain collection with attr.exclude_callchain_kernel == 0 even when attr.exclude_kernel == 1. That still requires kernel profiling privilege, but the existing check does not enforce it.

Update the permission check to call perf_allow_kernel() when either kernel sampling is requested or kernel callchains are requested.

This keeps permission checks aligned with requested data and prevents unprivileged use of kernel callchain capture.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98937"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-23T13:17:14Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf/core: Check kernel access when kernel callchains are requested\n\nperf_event_open() currently gates perf_allow_kernel() only on\n!attr.exclude_kernel.\n\nHowever, users can still request kernel callchain collection with\nattr.exclude_callchain_kernel == 0 even when attr.exclude_kernel == 1.\nThat still requires kernel profiling privilege, but the existing check\ndoes not enforce it.\n\nUpdate the permission check to call perf_allow_kernel() when either\nkernel sampling is requested or kernel callchains are requested.\n\nThis keeps permission checks aligned with requested data and prevents\nunprivileged use of kernel callchain capture.",
  "id": "GHSA-5cg4-h7ff-5xr5",
  "modified": "2026-10-23T15:31:31Z",
  "published": "2026-10-23T15:31:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98937"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/132bee76097be421ab3012130b5b506324cf2be1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2581b43e162cfc43e6f5d8dd8d2b38f3441550de"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6e187281f978a2bff98ead6aa40f8ddc9a2c9afb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a4573a3838ae4fc73b70019cfa1dac9aaea7cc2f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98937 (GCVE-0-2026-98937)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:11 – Updated: 2026-10-26 06:56

Title

perf/core: Check kernel access when kernel callchains are requested

Summary

In the Linux kernel, the following vulnerability has been resolved: perf/core: Check kernel access when kernel callchains are requested perf_event_open() currently gates perf_allow_kernel() only on !attr.exclude_kernel. However, users can still request kernel callchain collection with attr.exclude_callchain_kernel == 0 even when attr.exclude_kernel == 1. That still requires kernel profiling privilege, but the existing check does not enforce it. Update the permission check to call perf_allow_kernel() when either kernel sampling is requested or kernel callchains are requested. This keeps permission checks aligned with requested data and prevents unprivileged use of kernel callchain capture.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7067 records in the last 180 days details

References

4 references

URL	Tags
https://git.kernel.org/stable/c/132bee76097be421a…
https://git.kernel.org/stable/c/2581b43e162cfc43e…
https://git.kernel.org/stable/c/6e187281f978a2bff…
https://git.kernel.org/stable/c/a4573a3838ae4fc73…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0764771dab80d7b84b9a271bee7f1b21a04a3f0c , < 132bee76097be421ab3012130b5b506324cf2be1 (git) Affected: 0764771dab80d7b84b9a271bee7f1b21a04a3f0c , < 2581b43e162cfc43e6f5d8dd8d2b38f3441550de (git) Affected: 0764771dab80d7b84b9a271bee7f1b21a04a3f0c , < 6e187281f978a2bff98ead6aa40f8ddc9a2c9afb (git) Affected: 0764771dab80d7b84b9a271bee7f1b21a04a3f0c , < a4573a3838ae4fc73b70019cfa1dac9aaea7cc2f (git)
Linux	Linux	Affected: 2.6.31 Unaffected: 0 , < 2.6.31 (semver) Unaffected: 6.12.113 , ≤ 6.12.* (semver) Unaffected: 6.18.56 , ≤ 6.18.* (semver) Unaffected: 7.2.10 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/events/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "132bee76097be421ab3012130b5b506324cf2be1",
              "status": "affected",
              "version": "0764771dab80d7b84b9a271bee7f1b21a04a3f0c",
              "versionType": "git"
            },
            {
              "lessThan": "2581b43e162cfc43e6f5d8dd8d2b38f3441550de",
              "status": "affected",
              "version": "0764771dab80d7b84b9a271bee7f1b21a04a3f0c",
              "versionType": "git"
            },
            {
              "lessThan": "6e187281f978a2bff98ead6aa40f8ddc9a2c9afb",
              "status": "affected",
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            }
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.31"
            },
            {
              "lessThan": "2.6.31",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.56",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "2.6.31",
                  "vulnerable": true
                },
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      "providerMetadata": {
        "dateUpdated": "2026-10-26T06:56:51.396Z",
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    "datePublished": "2026-10-23T12:11:53.327Z",
    "dateReserved": "2026-09-25T10:25:14.381Z",
    "dateUpdated": "2026-10-26T06:56:51.396Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

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