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CVE-2026-43333 (GCVE-0-2026-43333)

Vulnerability from cvelistv5 – Published: 2026-05-08 13:31 – Updated: 2026-05-23 16:06
VLAI
Title
bpf: reject direct access to nullable PTR_TO_BUF pointers
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: reject direct access to nullable PTR_TO_BUF pointers check_mem_access() matches PTR_TO_BUF via base_type() which strips PTR_MAYBE_NULL, allowing direct dereference without a null check. Map iterator ctx->key and ctx->value are PTR_TO_BUF | PTR_MAYBE_NULL. On stop callbacks these are NULL, causing a kernel NULL dereference. Add a type_may_be_null() guard to the PTR_TO_BUF branch, matching the existing PTR_TO_BTF_ID pattern.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b453361384c2db1c703dacb806d5fd36aec4ceca , < 10bc4a4dcded509c5d5c67d497900c3922c604cd (git)
Affected: 20b2aff4bc15bda809f994761d5719827d66c0b4 , < 21a10c06ffae24cb01fd174a7ab7736001d2ea56 (git)
Affected: 20b2aff4bc15bda809f994761d5719827d66c0b4 , < 8755066f7bd0f4ac46a29d1708c7b20894539252 (git)
Affected: 20b2aff4bc15bda809f994761d5719827d66c0b4 , < 70abd9d118da2f56beb4ec22e3a29becae373535 (git)
Affected: 20b2aff4bc15bda809f994761d5719827d66c0b4 , < 63276547debc4d8a73eefb2c5273b2a905c961b0 (git)
Affected: 20b2aff4bc15bda809f994761d5719827d66c0b4 , < 4f6c99dc0420f1a3d671c1b8ab8a7ac84d9cba09 (git)
Affected: 20b2aff4bc15bda809f994761d5719827d66c0b4 , < b0db1accbc7395657c2b79db59fa9fae0d6656f3 (git)
Affected: e982070f8970bb62e69ed7c9cafff886ed200349 (git)
Affected: 5.15.37 , < 5.15.203 (semver)
Affected: 5.16.11 , < 5.17 (semver)
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Linux Linux Affected: 5.17
Unaffected: 0 , < 5.17 (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.134 , ≤ 6.6.* (semver)
Unaffected: 6.12.81 , ≤ 6.12.* (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:36:56+00:00",
      "cve": "CVE-2026-43333",
      "id": "CVE-2026-43333",
      "initial_release_date": "2026-05-08T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: reject direct access to nullable PTR_TO_BUF pointers",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43333.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:18:38Z",
      "cve": "CVE-2026-43333",
      "id": "CVE-2026-43333",
      "initial_release_date": "2026-05-11T14:14:10Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "528",
      "product_status:known_not_affected": "175",
      "product_status:recommended": "279",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43333",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43333.json",
      "version": "21"
    }
  }
}



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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.

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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.


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.