CVE-2024-42072

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It's not correct to prune\nexploration of the program at this point.\nNote, that this check doesn't limit the program to only one may_goto insn,\nsince 2nd and any further may_goto will increment may_goto_depth only\nin the queued state pushed for future exploration. The current state\nwill have may_goto_depth == 0 regardless of number of may_goto insns\nand the verifier has to explore the program until bpf_exit."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerability is reached through the bpf(BPF_PROG_LOAD) syscall, which requires local access to the machine; the mis-patched program is then run by attaching it to the attacker's own socket. No network-facing service parses the malicious input.\nAC:L - The attacker fully authors the BPF program and chooses the negative may_goto offset, so the 3-instruction control-flow skew is deterministic and reproducible on every load \u2014 no race, timing window, or unpredictable memory layout is involved.\nPR:L - may_goto carries no capability check in the verifier, and an unprivileged local user can load a BPF_PROG_TYPE_SOCKET_FILTER program whenever kernel.unprivileged_bpf_disabled is 0, or via a delegated BPF token / container-granted CAP_BPF (syscall.c:2753). Basic local user access is sufficient.\nUI:N - The attacker loads and attaches the program entirely on their own; execution is triggered by their own socket traffic with no action by any other user or administrator.\nS:U - The corruption occurs in kernel memory of the same host and results in a conventional local privilege escalation; no VM, IOMMU, or other security-authority boundary is crossed.\nC:H - The verified-vs-executed control-flow divergence lets the attacker skip the bounds/mask instructions guarding a load, turning it into a read from an attacker-chosen address \u2014 an arbitrary kernel memory read primitive that discloses arbitrary kernel data.\nI:H - The same primitive applied to a store gives an arbitrary kernel memory write with attacker-controlled address and value, a full verifier bypass that enables control-flow hijacking and privilege escalation.\nA:H - With off == -3 the patched JEQ becomes a self-jump, producing an unbreakable in-kernel loop (hard lockup / RCU stall), and the broken is_state_visited() check independently lets genuinely infinite loops pass verification; corrupted memory accesses also readily panic the kernel."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/verifier.c"], "versions": [{"version": "011832b97b311bb9e3c27945bc0d1089a14209c9", "lessThan": "175827e04f4be53f3dfb57edf12d0d49b18fd939", "status": "affected", "versionType": "git"}, {"version": "011832b97b311bb9e3c27945bc0d1089a14209c9", "lessThan": "2b2efe1937ca9f8815884bd4dcd5b32733025103", "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/verifier.c"], "versions": [{"version": "6.9", "status": "affected"}, {"version": "0", "lessThan": "6.9", "status": "unaffected", "versionType": "semver"}, {"version": "6.9.8", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.10", "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": "6.9", "versionEndExcluding": "6.9.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.10"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/175827e04f4be53f3dfb57edf12d0d49b18fd939"}, {"url": "https://git.kernel.org/stable/c/2b2efe1937ca9f8815884bd4dcd5b32733025103"}], "title": "bpf: Fix may_goto with negative offset.", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T04:54:31.986Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/175827e04f4be53f3dfb57edf12d0d49b18fd939", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/2b2efe1937ca9f8815884bd4dcd5b32733025103", "tags": ["x_transferred"]}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-42072", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T16:19:39.749938Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:33:57.942Z"}}]}}

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When offset is negative\nit should be patched differently.\nThe 2nd bug is in the verifier:\nwhen current state may_goto_depth is equal to visited state may_goto_depth\nit means there is an actual infinite loop. It's not correct to prune\nexploration of the program at this point.\nNote, that this check doesn't limit the program to only one may_goto insn,\nsince 2nd and any further may_goto will increment may_goto_depth only\nin the queued state pushed for future exploration. The current state\nwill have may_goto_depth == 0 regardless of number of may_goto insns\nand the verifier has to explore the program until bpf_exit."}, {"lang": "es", "value": " En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: bpf: corrige may_goto con desplazamiento negativo. El syzbot de Zac cre\u00f3 un programa bpf que expuso dos errores en may_goto. El primer error es la forma en que se parchea may_goto. Cuando el desplazamiento es negativo, se debe parchear de manera diferente. El segundo error est\u00e1 en el verificador: cuando el estado actual may_goto_ Depth es igual al estado visitado may_goto_ Depth, significa que hay un bucle infinito real. No es correcto podar la exploraci\u00f3n del programa en este momento. Tenga en cuenta que esta verificaci\u00f3n no limita el programa a solo un may_goto insn, ya que el segundo may_goto y cualquier otro may_goto incrementar\u00e1 may_goto_profundidad solo en el estado en cola enviado para exploraci\u00f3n futura. El estado actual tendr\u00e1 may_goto_ Depth == 0 independientemente del n\u00famero de may_goto insns y el verificador tiene que explorar el programa hasta bpf_exit."}], "id": "CVE-2024-42072", "lastModified": "2026-08-04T11:19:31.700", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-42072", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T16:19:39.749938Z", "version": "2.0.3"}}]}, "published": "2024-07-29T16:15:06.693", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/175827e04f4be53f3dfb57edf12d0d49b18fd939"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2b2efe1937ca9f8815884bd4dcd5b32733025103"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/175827e04f4be53f3dfb57edf12d0d49b18fd939"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2b2efe1937ca9f8815884bd4dcd5b32733025103"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: bpf: Fix may_goto with negative offset.", "id": "2300510", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2300510"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.2", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:H", "status": "draft"}, "cwe": "CWE-822", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbpf: Fix may_goto with negative offset.\nZac's syzbot crafted a bpf prog that exposed two bugs in may_goto.\nThe 1st bug is the way may_goto is patched. When offset is negative\nit should be patched differently.\nThe 2nd bug is in the verifier:\nwhen current state may_goto_depth is equal to visited state may_goto_depth\nit means there is an actual infinite loop. It's not correct to prune\nexploration of the program at this point.\nNote, that this check doesn't limit the program to only one may_goto insn,\nsince 2nd and any further may_goto will increment may_goto_depth only\nin the queued state pushed for future exploration. The current state\nwill have may_goto_depth == 0 regardless of number of may_goto insns\nand the verifier has to explore the program until bpf_exit."], "name": "CVE-2024-42072", "package_state": [{"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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "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": "2024-07-29T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-42072\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-42072\nhttps://lore.kernel.org/linux-cve-announce/2024072953-CVE-2024-42072-d6af@gregkh/T"], "threat_severity": "Low"}

{}