CVE-2026-43306

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43306", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:56.000Z", "datePublished": "2026-05-08T13:11:25.624Z", "dateUpdated": "2026-05-11T22:22:00.468Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T22:22:00.468Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: crypto: Use the correct destructor kfunc type\n\nWith CONFIG_CFI enabled, the kernel strictly enforces that indirect\nfunction calls use a function pointer type that matches the target\nfunction. I ran into the following type mismatch when running BPF\nself-tests:\n\n CFI failure at bpf_obj_free_fields+0x190/0x238 (target:\n bpf_crypto_ctx_release+0x0/0x94; expected type: 0xa488ebfc)\n Internal error: Oops - CFI: 00000000f2008228 [#1] SMP\n ...\n\nAs bpf_crypto_ctx_release() is also used in BPF programs and using\na void pointer as the argument would make the verifier unhappy, add\na simple stub function with the correct type and register it as the\ndestructor kfunc instead."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/crypto.c"], "versions": [{"version": "3e1c6f35409f9e447bf37f64840f5b65576bfb78", "lessThan": "4e3e57dbf46dad3498f8c4219ce2dba756875962", "status": "affected", "versionType": "git"}, {"version": "3e1c6f35409f9e447bf37f64840f5b65576bfb78", "lessThan": "50d6fd69388cc7b05dce72f09080674dcede4ac9", "status": "affected", "versionType": "git"}, {"version": "3e1c6f35409f9e447bf37f64840f5b65576bfb78", "lessThan": "3979a550fe06b370d73647f59cf462fa525c9ec4", "status": "affected", "versionType": "git"}, {"version": "3e1c6f35409f9e447bf37f64840f5b65576bfb78", "lessThan": "b40a5d724f29fc2eed23ff353808a9aae616b48a", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/crypto.c"], "versions": [{"version": "6.10", "status": "affected"}, {"version": "0", "lessThan": "6.10", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.75", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.16", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.6", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.12.75"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.18.16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.19.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4e3e57dbf46dad3498f8c4219ce2dba756875962"}, {"url": "https://git.kernel.org/stable/c/50d6fd69388cc7b05dce72f09080674dcede4ac9"}, {"url": "https://git.kernel.org/stable/c/3979a550fe06b370d73647f59cf462fa525c9ec4"}, {"url": "https://git.kernel.org/stable/c/b40a5d724f29fc2eed23ff353808a9aae616b48a"}], "title": "bpf: crypto: Use the correct destructor kfunc type", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/bpf/crypto.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "4e3e57dbf46dad3498f8c4219ce2dba756875962", "status": "affected", "version": "3e1c6f35409f9e447bf37f64840f5b65576bfb78", "versionType": "git"}, {"lessThan": "50d6fd69388cc7b05dce72f09080674dcede4ac9", "status": "affected", "version": "3e1c6f35409f9e447bf37f64840f5b65576bfb78", "versionType": "git"}, {"lessThan": "3979a550fe06b370d73647f59cf462fa525c9ec4", "status": "affected", "version": "3e1c6f35409f9e447bf37f64840f5b65576bfb78", "versionType": "git"}, {"lessThan": "b40a5d724f29fc2eed23ff353808a9aae616b48a", "status": "affected", "version": "3e1c6f35409f9e447bf37f64840f5b65576bfb78", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/bpf/crypto.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.10"}, {"lessThan": "6.10", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.75", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.16", "versionType": "semver"}, {"lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "CB67FC73-CF7B-41DB-A5A5-423C53BE93EF", "versionEndExcluding": "6.12.75", "versionStartIncluding": "6.10", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B", "versionEndExcluding": "6.18.16", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67", "versionEndExcluding": "6.19.6", "versionStartIncluding": "6.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: crypto: Use the correct destructor kfunc type\n\nWith CONFIG_CFI enabled, the kernel strictly enforces that indirect\nfunction calls use a function pointer type that matches the target\nfunction. I ran into the following type mismatch when running BPF\nself-tests:\n\n CFI failure at bpf_obj_free_fields+0x190/0x238 (target:\n bpf_crypto_ctx_release+0x0/0x94; expected type: 0xa488ebfc)\n Internal error: Oops - CFI: 00000000f2008228 [#1] SMP\n ...\n\nAs bpf_crypto_ctx_release() is also used in BPF programs and using\na void pointer as the argument would make the verifier unhappy, add\na simple stub function with the correct type and register it as the\ndestructor kfunc instead."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbpf: crypto: Usar el tipo de kfunc de destructor correcto\n\nCon CONFIG_CFI habilitado, el kernel aplica estrictamente que las llamadas a funciones indirectas usen un tipo de puntero de funci\u00f3n que coincida con la funci\u00f3n objetivo. Me encontr\u00e9 con la siguiente falta de coincidencia de tipo al ejecutar las auto-pruebas de BPF:\n\n Fallo de CFI en bpf_obj_free_fields+0x190/0x238 (objetivo:\n bpf_crypto_ctx_release+0x0/0x94; tipo esperado: 0x a488ebfc)\n Error interno: Oops - CFI: 00000000f2008228 [#1] SMP\n ...\n\nComo bpf_crypto_ctx_release() tambi\u00e9n se usa en programas BPF y usar un puntero void como argumento har\u00eda que el verificador no estuviera satisfecho, a\u00f1adir una funci\u00f3n stub simple con el tipo correcto y registrarla como el kfunc de destructor en su lugar."}], "id": "CVE-2026-43306", "lastModified": "2026-11-11T20:10:00.273", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-05-08T14:16:37.913", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3979a550fe06b370d73647f59cf462fa525c9ec4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4e3e57dbf46dad3498f8c4219ce2dba756875962"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/50d6fd69388cc7b05dce72f09080674dcede4ac9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b40a5d724f29fc2eed23ff353808a9aae616b48a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: bpf: crypto: Use the correct destructor kfunc type", "id": "2468100", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468100"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-843", "details": ["A flaw was found in the Linux kernel's Berkeley Packet Filter (BPF) crypto component. A local attacker, by running a specially crafted BPF program, could trigger a type mismatch in function pointers when Control Flow Integrity (CFI) is enabled. This can lead to a kernel internal error, resulting in a system crash and a Denial of Service (DoS)."], "name": "CVE-2026-43306", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43306\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43306\nhttps://lore.kernel.org/linux-cve-announce/2026050858-CVE-2026-43306-f687@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,4e3e57dbf46dad3498f8c4219ce2dba756875962)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,50d6fd69388cc7b05dce72f09080674dcede4ac9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,3979a550fe06b370d73647f59cf462fa525c9ec4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,b40a5d724f29fc2eed23ff353808a9aae616b48a)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.75,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.16,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.6,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-08T15:15:10.794822+00:00", "updated": "2026-05-15T22:00:12.876673+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}