{"api_version":"1","generated_at":"2026-07-23T15:28:05+00:00","cve":"CVE-2026-43333","urls":{"html":"https://cve.report/CVE-2026-43333","api":"https://cve.report/api/cve/CVE-2026-43333.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-43333","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-43333"},"summary":{"title":"bpf: reject direct access to nullable PTR_TO_BUF pointers","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: reject direct access to nullable PTR_TO_BUF pointers\n\ncheck_mem_access() matches PTR_TO_BUF via base_type() which strips\nPTR_MAYBE_NULL, allowing direct dereference without a null check.\n\nMap iterator ctx->key and ctx->value are PTR_TO_BUF | PTR_MAYBE_NULL.\nOn stop callbacks these are NULL, causing a kernel NULL dereference.\n\nAdd a type_may_be_null() guard to the PTR_TO_BUF branch, matching the\nexisting PTR_TO_BTF_ID pattern.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-08 14:16:43","updated_at":"2026-05-15 20:07:34"},"problem_types":["CWE-476"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"5.5","severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}}],"references":[{"url":"https://git.kernel.org/stable/c/4f6c99dc0420f1a3d671c1b8ab8a7ac84d9cba09","name":"https://git.kernel.org/stable/c/4f6c99dc0420f1a3d671c1b8ab8a7ac84d9cba09","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/21a10c06ffae24cb01fd174a7ab7736001d2ea56","name":"https://git.kernel.org/stable/c/21a10c06ffae24cb01fd174a7ab7736001d2ea56","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/10bc4a4dcded509c5d5c67d497900c3922c604cd","name":"https://git.kernel.org/stable/c/10bc4a4dcded509c5d5c67d497900c3922c604cd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/70abd9d118da2f56beb4ec22e3a29becae373535","name":"https://git.kernel.org/stable/c/70abd9d118da2f56beb4ec22e3a29becae373535","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/63276547debc4d8a73eefb2c5273b2a905c961b0","name":"https://git.kernel.org/stable/c/63276547debc4d8a73eefb2c5273b2a905c961b0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8755066f7bd0f4ac46a29d1708c7b20894539252","name":"https://git.kernel.org/stable/c/8755066f7bd0f4ac46a29d1708c7b20894539252","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b0db1accbc7395657c2b79db59fa9fae0d6656f3","name":"https://git.kernel.org/stable/c/b0db1accbc7395657c2b79db59fa9fae0d6656f3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-43333","name":"CVE 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reject direct access to nullable PTR_TO_BUF pointers","CVE":"CVE-2026-43333","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"43333","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: reject direct access to nullable PTR_TO_BUF pointers\n\ncheck_mem_access() matches PTR_TO_BUF via base_type() which strips\nPTR_MAYBE_NULL, allowing direct dereference without a null check.\n\nMap iterator ctx->key and ctx->value are PTR_TO_BUF | PTR_MAYBE_NULL.\nOn stop callbacks these are NULL, causing a kernel NULL dereference.\n\nAdd a type_may_be_null() guard to the PTR_TO_BUF branch, matching the\nexisting PTR_TO_BTF_ID pattern.","Type":"Description","Title":"bpf: reject direct access to nullable PTR_TO_BUF pointers"}]}}}