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  4. CVE 2026 43333 bpf reject direct access to nullable ptrtobuf
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Back to active CVEs
Unknown severity · Source severity not reportedCVE-2026-43333

bpf: reject direct access to nullable PTR_TO_BUF pointersCVE-2026-43333

Answer in brief

CVE-2026-43333 records a Unknown severity vulnerability in bpf: reject direct access to nullable PTR_TO_BUF pointers. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published May 8, 2026Updated Nov 6, 2026Source checked Nov 6, 2026First seen by HOL Nov 6, 2026Material review Nov 6, 2026
Upstream Advisory

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Nov 6, 2026
References
7 linked sources
Open source record

Key facts

Risk
Unknown severitySource severity not reported
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=b453361384c2db1c703dacb806d5fd36aec4ceca <10bc4a4dcded509c5d5c67d497900c3922c604cd || >=20b2aff4bc15bda809f994761d5719827d66c0b4 <21a10c06ffae24cb01fd174a7ab7736001d2ea56 || >=20b2aff4bc15bda809f994761d5719827d66c0b4 <8755066f7bd0f4ac46a29d1708c7b20894539252 || >=20b2aff4bc15bda809f994761d5719827d66c0b4 <70abd9d118da2f56beb4ec22e3a29becae373535 || >=20b2aff4bc15bda809f994761d5719827d66c0b4 <63276547debc4d8a73eefb2c5273b2a905c961b0 || >=20b2aff4bc15bda809f994761d5719827d66c0b4 <4f6c99dc0420f1a3d671c1b8ab8a7ac84d9cba09 || >=20b2aff4bc15bda809f994761d5719827d66c0b4 <b0db1accbc7395657c2b79db59fa9fae0d6656f3 || e982070f8970bb62e69ed7c9cafff886ed200349 || >=5.15.37 <5.15.203 || >=5.16.11 <5.1710bc4a4dcded509c5d5c67d497900c3922c604cd, 21a10c06ffae24cb01fd174a7ab7736001d2ea56, 8755066f7bd0f4ac46a29d1708c7b20894539252, 70abd9d118da2f56beb4ec22e3a29becae373535, 63276547debc4d8a73eefb2c5273b2a905c961b0, 4f6c99dc0420f1a3d671c1b8ab8a7ac84d9cba09, b0db1accbc7395657c2b79db59fa9fae0d6656f3, 5.15.203, 5.17
Linux/Linuxgeneric5.17Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to 10bc4a4dcded509c5d5c67d497900c3922c604cd if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    May 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 6, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.