Vulnerability-Lookup

GHSA-73F2-5QH8-H6CG

Vulnerability from github – Published: 2026-10-18 18:31 – Updated: 2026-10-30 15:33

Details

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

perf: Require kernel access for text poke events

Perf events with exclude_kernel=1 can be opened without kernel perf access. However, exclude_kernel does not suppress text-poke sideband records. Every PERF_RECORD_TEXT_POKE is marked PERF_RECORD_MISC_KERNEL and contains a raw kernel instruction address.

An unprivileged task can therefore open and mmap a task-local software event with text_poke=1. Both opening a count-only tracepoint event and configuring UDP GRO for ESP-in-UDP cause updates to inline static calls; the observer receives the relocated addresses of the modified instructions. For a known kernel image, any such address reveals the runtime kernel text base despite KASLR.

Call perf_allow_kernel() whenever attr.text_poke is set, regardless of exclude_kernel. Events that neither monitor kernel execution nor request text-poke records retain their existing permissions.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-98655"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-18T16:17:18Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Require kernel access for text poke events\n\nPerf events with exclude_kernel=1 can be opened without kernel perf\naccess. However, exclude_kernel does not suppress text-poke sideband\nrecords. Every PERF_RECORD_TEXT_POKE is marked PERF_RECORD_MISC_KERNEL\nand contains a raw kernel instruction address.\n\nAn unprivileged task can therefore open and mmap a task-local software\nevent with text_poke=1. Both opening a count-only tracepoint event and\nconfiguring UDP GRO for ESP-in-UDP cause updates to inline static calls;\nthe observer receives the relocated addresses of the modified instructions.\nFor a known kernel image, any such address reveals the runtime kernel\ntext base despite KASLR.\n\nCall perf_allow_kernel() whenever attr.text_poke is set, regardless of\nexclude_kernel. Events that neither monitor kernel execution nor request\ntext-poke records retain their existing permissions.",
  "id": "GHSA-73f2-5qh8-h6cg",
  "modified": "2026-10-30T15:33:54Z",
  "published": "2026-10-18T18:31:58Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98655"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0e26d44b7c64b045adebcf5d614140f811f09752"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/357e8a77a501d96c9517f01f4a211eed5e9c9184"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4d8fc6290d14aa9e4c3b620fe3e5dc8ba3bea7e3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/677d0b51ac1a0db55d768c4c6399210b3de0795b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8c38cb055f6a9651198780e4e4d5283de4039f79"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c30886396eb1c0e9fdc4296398dea0db0ab37610"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e506333d1b9f42f1e402acebf1283af3c44a3809"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98655 (GCVE-0-2026-98655)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:44 – Updated: 2026-10-30 12:38

Title

perf: Require kernel access for text poke events

Summary

In the Linux kernel, the following vulnerability has been resolved: perf: Require kernel access for text poke events Perf events with exclude_kernel=1 can be opened without kernel perf access. However, exclude_kernel does not suppress text-poke sideband records. Every PERF_RECORD_TEXT_POKE is marked PERF_RECORD_MISC_KERNEL and contains a raw kernel instruction address. An unprivileged task can therefore open and mmap a task-local software event with text_poke=1. Both opening a count-only tracepoint event and configuring UDP GRO for ESP-in-UDP cause updates to inline static calls; the observer receives the relocated addresses of the modified instructions. For a known kernel image, any such address reveals the runtime kernel text base despite KASLR. Call perf_allow_kernel() whenever attr.text_poke is set, regardless of exclude_kernel. Events that neither monitor kernel execution nor request text-poke records retain their existing permissions.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6820 records in the last 180 days details

References

8 references

URL	Tags
https://git.kernel.org/stable/c/4d8fc6290d14aa9e4…
https://git.kernel.org/stable/c/c30886396eb1c0e9f…
https://git.kernel.org/stable/c/0e26d44b7c64b045a…
https://git.kernel.org/stable/c/8c38cb055f6a96511…
https://git.kernel.org/stable/c/8473f44db9f710ea6…
https://git.kernel.org/stable/c/e506333d1b9f42f1e…
https://git.kernel.org/stable/c/677d0b51ac1a0db55…
https://git.kernel.org/stable/c/357e8a77a501d96c9…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: e17d43b93e544f5016c0251d2074c15568d5d963 , < 4d8fc6290d14aa9e4c3b620fe3e5dc8ba3bea7e3 (git) Affected: e17d43b93e544f5016c0251d2074c15568d5d963 , < c30886396eb1c0e9fdc4296398dea0db0ab37610 (git) Affected: e17d43b93e544f5016c0251d2074c15568d5d963 , < 0e26d44b7c64b045adebcf5d614140f811f09752 (git) Affected: e17d43b93e544f5016c0251d2074c15568d5d963 , < 8c38cb055f6a9651198780e4e4d5283de4039f79 (git) Affected: e17d43b93e544f5016c0251d2074c15568d5d963 , < 8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7 (git) Affected: e17d43b93e544f5016c0251d2074c15568d5d963 , < e506333d1b9f42f1e402acebf1283af3c44a3809 (git) Affected: e17d43b93e544f5016c0251d2074c15568d5d963 , < 677d0b51ac1a0db55d768c4c6399210b3de0795b (git) Affected: e17d43b93e544f5016c0251d2074c15568d5d963 , < 357e8a77a501d96c9517f01f4a211eed5e9c9184 (git)
Linux	Linux	Affected: 5.9 Unaffected: 0 , < 5.9 (semver) Unaffected: 5.10.273 , ≤ 5.10.* (semver) Unaffected: 5.15.224 , ≤ 5.15.* (semver) Unaffected: 6.1.191 , ≤ 6.1.* (semver) Unaffected: 6.6.160 , ≤ 6.6.* (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)

Show details on NVD website

JSON

To clipboard

{
  "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": "4d8fc6290d14aa9e4c3b620fe3e5dc8ba3bea7e3",
              "status": "affected",
              "version": "e17d43b93e544f5016c0251d2074c15568d5d963",
              "versionType": "git"
            },
            {
              "lessThan": "c30886396eb1c0e9fdc4296398dea0db0ab37610",
              "status": "affected",
              "version": "e17d43b93e544f5016c0251d2074c15568d5d963",
              "versionType": "git"
            },
            {
              "lessThan": "0e26d44b7c64b045adebcf5d614140f811f09752",
              "status": "affected",
              "version": "e17d43b93e544f5016c0251d2074c15568d5d963",
              "versionType": "git"
            },
            {
              "lessThan": "8c38cb055f6a9651198780e4e4d5283de4039f79",
              "status": "affected",
              "version": "e17d43b93e544f5016c0251d2074c15568d5d963",
              "versionType": "git"
            },
            {
              "lessThan": "8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7",
              "status": "affected",
              "version": "e17d43b93e544f5016c0251d2074c15568d5d963",
              "versionType": "git"
            },
            {
              "lessThan": "e506333d1b9f42f1e402acebf1283af3c44a3809",
              "status": "affected",
              "version": "e17d43b93e544f5016c0251d2074c15568d5d963",
              "versionType": "git"
            },
            {
              "lessThan": "677d0b51ac1a0db55d768c4c6399210b3de0795b",
              "status": "affected",
              "version": "e17d43b93e544f5016c0251d2074c15568d5d963",
              "versionType": "git"
            },
            {
              "lessThan": "357e8a77a501d96c9517f01f4a211eed5e9c9184",
              "status": "affected",
              "version": "e17d43b93e544f5016c0251d2074c15568d5d963",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/events/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.9"
            },
            {
              "lessThan": "5.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.273",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.224",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.273",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.224",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.191",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.160",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.113",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.56",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.10",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Require kernel access for text poke events\n\nPerf events with exclude_kernel=1 can be opened without kernel perf\naccess. However, exclude_kernel does not suppress text-poke sideband\nrecords. Every PERF_RECORD_TEXT_POKE is marked PERF_RECORD_MISC_KERNEL\nand contains a raw kernel instruction address.\n\nAn unprivileged task can therefore open and mmap a task-local software\nevent with text_poke=1. Both opening a count-only tracepoint event and\nconfiguring UDP GRO for ESP-in-UDP cause updates to inline static calls;\nthe observer receives the relocated addresses of the modified instructions.\nFor a known kernel image, any such address reveals the runtime kernel\ntext base despite KASLR.\n\nCall perf_allow_kernel() whenever attr.text_poke is set, regardless of\nexclude_kernel. Events that neither monitor kernel execution nor request\ntext-poke records retain their existing permissions."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:38:27.085Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4d8fc6290d14aa9e4c3b620fe3e5dc8ba3bea7e3"
        },
        {
          "url": "https://git.kernel.org/stable/c/c30886396eb1c0e9fdc4296398dea0db0ab37610"
        },
        {
          "url": "https://git.kernel.org/stable/c/0e26d44b7c64b045adebcf5d614140f811f09752"
        },
        {
          "url": "https://git.kernel.org/stable/c/8c38cb055f6a9651198780e4e4d5283de4039f79"
        },
        {
          "url": "https://git.kernel.org/stable/c/8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7"
        },
        {
          "url": "https://git.kernel.org/stable/c/e506333d1b9f42f1e402acebf1283af3c44a3809"
        },
        {
          "url": "https://git.kernel.org/stable/c/677d0b51ac1a0db55d768c4c6399210b3de0795b"
        },
        {
          "url": "https://git.kernel.org/stable/c/357e8a77a501d96c9517f01f4a211eed5e9c9184"
        }
      ],
      "title": "perf: Require kernel access for text poke events",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98655",
    "datePublished": "2026-10-18T15:44:05.722Z",
    "dateReserved": "2026-09-25T10:25:14.362Z",
    "dateUpdated": "2026-10-30T12:38:27.085Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted