Vulnerability-Lookup

GHSA-4J6H-QQH4-VPW7

Vulnerability from github – Published: 2026-05-06 12:30 – Updated: 2026-05-08 15:31

Details

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

eventpoll: defer struct eventpoll free to RCU grace period

In certain situations, ep_free() in eventpoll.c will kfree the epi->ep eventpoll struct while it still being used by another concurrent thread. Defer the kfree() to an RCU callback to prevent UAF.

Severity ?

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-43074"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-401"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-06T10:16:20Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\neventpoll: defer struct eventpoll free to RCU grace period\n\nIn certain situations, ep_free() in eventpoll.c will kfree the epi-\u003eep\neventpoll struct while it still being used by another concurrent thread.\nDefer the kfree() to an RCU callback to prevent UAF.",
  "id": "GHSA-4j6h-qqh4-vpw7",
  "modified": "2026-05-08T15:31:15Z",
  "published": "2026-05-06T12:30:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43074"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/07712db80857d5d09ae08f3df85a708ecfc3b61f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5b1173b165421561db29f30afc7e97d940a398a9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7e8083f5eeedab0f460063b9c2c14c9a4e71a427"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a6566cd33f6f967a7651ebf2ce0dd31572e319cf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ae0bb9c1fb7c2594519aeeb096cf2c3b7837b322"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-43074 (GCVE-0-2026-43074)

Vulnerability from cvelistv5 – Published: 2026-05-06 07:21 – Updated: 2026-05-11 22:17

Title

eventpoll: defer struct eventpoll free to RCU grace period

Summary

In the Linux kernel, the following vulnerability has been resolved: eventpoll: defer struct eventpoll free to RCU grace period In certain situations, ep_free() in eventpoll.c will kfree the epi->ep eventpoll struct while it still being used by another concurrent thread. Defer the kfree() to an RCU callback to prevent UAF.

Severity ?

7.8 (High)


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

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/a6566cd33f6f967a7…
https://git.kernel.org/stable/c/5b1173b165421561d…
https://git.kernel.org/stable/c/7e8083f5eeedab0f4…
https://git.kernel.org/stable/c/ae0bb9c1fb7c25945…
https://git.kernel.org/stable/c/07712db80857d5d09…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 58c9b016e12855286370dfb704c08498edbc857a , < a6566cd33f6f967a7651ebf2ce0dd31572e319cf (git) Affected: 58c9b016e12855286370dfb704c08498edbc857a , < 5b1173b165421561db29f30afc7e97d940a398a9 (git) Affected: 58c9b016e12855286370dfb704c08498edbc857a , < 7e8083f5eeedab0f460063b9c2c14c9a4e71a427 (git) Affected: 58c9b016e12855286370dfb704c08498edbc857a , < ae0bb9c1fb7c2594519aeeb096cf2c3b7837b322 (git) Affected: 58c9b016e12855286370dfb704c08498edbc857a , < 07712db80857d5d09ae08f3df85a708ecfc3b61f (git)
Linux	Linux	Affected: 6.4 Unaffected: 0 , < 6.4 (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)

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JSON

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{
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/eventpoll.c"
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              "versionType": "git"
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              "versionType": "git"
            }
          ]
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          ],
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          "versions": [
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              "lessThanOrEqual": "6.12.*",
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              "versionType": "semver"
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            {
              "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": [
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          "nodes": [
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      ],
      "metrics": [
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          "cvssV3_1": {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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        "dateUpdated": "2026-05-11T22:17:13.022Z",
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        {
          "url": "https://git.kernel.org/stable/c/07712db80857d5d09ae08f3df85a708ecfc3b61f"
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    "datePublished": "2026-05-06T07:21:58.210Z",
    "dateReserved": "2026-05-01T14:12:55.982Z",
    "dateUpdated": "2026-05-11T22:17:13.022Z",
    "state": "PUBLISHED"
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}

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.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-4J6H-QQH4-VPW7

CVE-2026-43074 (GCVE-0-2026-43074)

Tags

Sightings

Nomenclature