CVE-2021-31440 (GCVE-0-2021-31440)

Vulnerability from cvelistv5 – Published: 2021-05-21 14:30 – Updated: 2024-08-03 22:55
VLAI
Summary
This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel 5.11.15. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the handling of eBPF programs. The issue results from the lack of proper validation of user-supplied eBPF programs prior to executing them. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel. Was ZDI-CAN-13661.
Severity
8.8 (High)
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE
Assigner
zdi
References
Impacted products
Vendor Product Version
Linux Kernel Affected: 5.11.15
Create a notification for this product.
Credits
Manfred Paul
Show details on NVD website
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T05:24:22+00:00",
      "cve": "CVE-2021-31440",
      "id": "CVE-2021-31440",
      "initial_release_date": "2021-05-21T00:00:00+00:00",
      "product_status:fixed": "150",
      "product_status:known_not_affected": "149",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: local escalation of privileges in handling of eBPF programs",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-31440.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2025-08-06T03:04:53Z",
      "cve": "CVE-2021-31440",
      "id": "CVE-2021-31440",
      "initial_release_date": "2023-02-15T03:41:24Z",
      "product_status:known_affected": "2",
      "product_status:known_not_affected": "268",
      "product_status:recommended": "29",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-31440",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-31440.json",
      "version": "12"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.