CVE-2026-43070

{"id": "CVE-2026-43070", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4c03342e5ac532fb34d13a7b51dd7261dfc48963", "lessThan": "a17443af874229408ce6b78e2c8a2b5adeb4b7d8", "versionType": "git"}, {"status": "affected", "version": "d00ce96623a69a100ad79675d0e85fda3c50d89b", "lessThan": "0d15c3611a2cc5d08993545d4032055ae10ae2c1", "versionType": "git"}, {"status": "affected", "version": "9d21199842247ab05c675fb9b6c6ca393a5c0024", "lessThan": "a3125bc01884431d30d731461634c8295b6f0529", "versionType": "git"}], "programFiles": ["kernel/bpf/verifier.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.18.17", "lessThan": "6.18.21", "versionType": "semver"}, {"status": "affected", "version": "6.19.7", "lessThan": "6.19.11", "versionType": "semver"}], "programFiles": ["kernel/bpf/verifier.c"], "defaultStatus": "unaffected"}]}], "published": "2026-05-05T16:16:16.320", "references": [{"url": "https://git.kernel.org/stable/c/0d15c3611a2cc5d08993545d4032055ae10ae2c1", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/a17443af874229408ce6b78e2c8a2b5adeb4b7d8", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/a3125bc01884431d30d731461634c8295b6f0529", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-125"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reset register ID for BPF_END value tracking\n\nWhen a register undergoes a BPF_END (byte swap) operation, its scalar\nvalue is mutated in-place. If this register previously shared a scalar ID\nwith another register (e.g., after an `r1 = r0` assignment), this tie must\nbe broken.\n\nCurrently, the verifier misses resetting `dst_reg->id` to 0 for BPF_END.\nConsequently, if a conditional jump checks the swapped register, the\nverifier incorrectly propagates the learned bounds to the linked register,\nleading to false confidence in the linked register's value and potentially\nallowing out-of-bounds memory accesses.\n\nFix this by explicitly resetting `dst_reg->id` to 0 in the BPF_END case\nto break the scalar tie, similar to how BPF_NEG handles it via\n`__mark_reg_known`."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbpf: Restablecer ID de registro para el seguimiento de valores BPF_END\n\nCuando un registro se somete a una operaci\u00f3n BPF_END (intercambio de bytes), su valor escalar se muta in situ. Si este registro previamente compart\u00eda un ID escalar con otro registro (por ejemplo, despu\u00e9s de una asignaci\u00f3n \u2019r1 = r0\u2019), este v\u00ednculo debe romperse.\n\nActualmente, el verificador omite restablecer \u2019dst_reg -> id\u2019 a 0 para BPF_END. En consecuencia, si un salto condicional verifica el registro intercambiado, el verificador propaga incorrectamente los l\u00edmites aprendidos al registro vinculado, lo que lleva a una falsa confianza en el valor del registro vinculado y potencialmente permitiendo accesos a memoria fuera de l\u00edmites.\n\nSolucionar esto restableciendo expl\u00edcitamente \u2019dst_reg -> id\u2019 a 0 en el caso BPF_END para romper el v\u00ednculo escalar, similar a c\u00f3mo BPF_NEG lo maneja a trav\u00e9s de \u2019__mark_reg_known\u2019."}], "lastModified": "2026-11-11T21:10:00.200", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3EF23CE5-8E2E-47D1-9B2C-449AA5BB1870", "versionEndExcluding": "6.18.21", "versionStartIncluding": "6.18.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0F154E5F-DF7A-4EB9-BAFA-13EC093D679A", "versionEndExcluding": "6.19.11", "versionStartIncluding": "6.19.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}