CVE-2024-45020

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More specifically, it is the following code:\n\n if (exact != NOT_EXACT &&\n old->stack[spi].slot_type[i % BPF_REG_SIZE] !=\n cur->stack[spi].slot_type[i % BPF_REG_SIZE])\n return false;\n\nThe 'i' iterates old->allocated_stack.\nIf cur->allocated_stack < old->allocated_stack the out-of-bound\naccess will happen.\n\nTo fix the issue add 'i >= cur->allocated_stack' check such that if\nthe condition is true, stacksafe() should fail. Otherwise,\ncur->stack[spi].slot_type[i % BPF_REG_SIZE] memory access is legal."}], "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 system; there is no remote or adjacent-network path to the verifier.\nAC:L - The attacker fully authors the BPF program and deterministically constructs two converging paths with differing allocated_stack under an exact-comparison loop (as the upstream selftest demonstrates); no race or uncontrolled precondition is involved.\nPR:L - With unprivileged_bpf_disabled=0 an unprivileged local user can load SOCKET_FILTER/CGROUP_SKB programs, and BPF tokens (bpf_token_capable) delegate prog-load into unprivileged user namespaces; in both cases the verifier itself is the security boundary being broken.\nUI:N - The attacker triggers the bug entirely from their own process by loading a crafted BPF program; no action by any other user is required.\nS:U - The out-of-bounds access occurs in kernel memory within the same security authority as the attacking process; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is an out-of-bounds slab read reaching up to ~8KB past a small kmalloc'd bpf_stack_state array, far beyond a few bounded bytes, and the read bytes are compared against attacker-chosen slot_type values whose outcome is observable through verifier log/state-pruning behaviour, forming a heap-content oracle.\nI:H - Uncontrolled out-of-bounds heap data drives the state-equivalence verdict in exact-comparison mode, the mechanism that guarantees soundness of iterator and loop convergence; a wrongly-equal verdict prunes paths that were never verified, and an accepted unsafe program yields arbitrary kernel memory writes.\nA:H - When the compared frame has allocated_stack==0 the stack pointer is NULL/ZERO_SIZE_PTR, so the access is a deterministic kernel oops (the originally reported \"kernel verifier crash\"), and the slab case produces KASAN reports or faults on unmapped pages."}]}], "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": "ab470fefce2837e66b771c60858118d50bb5bb10", "lessThan": "7cad3174cc79519bf5f6c4441780264416822c08", "status": "affected", "versionType": "git"}, {"version": "2793a8b015f7f1caadb9bce9c63dc659f7522676", "lessThan": "6e3987ac310c74bb4dd6a2fa8e46702fe505fb2b", "status": "affected", "versionType": "git"}, {"version": "2793a8b015f7f1caadb9bce9c63dc659f7522676", "lessThan": "bed2eb964c70b780fb55925892a74f26cb590b25", "status": "affected", "versionType": "git"}, {"version": "6.6.15", "lessThan": "6.6.48", "status": "affected", "versionType": "semver"}]}, {"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": "6.7", "status": "affected"}, {"version": "0", "lessThan": "6.7", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.48", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.10.7", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.11", "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": "6.6.15", "versionEndExcluding": "6.6.48"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.10.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.11"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/7cad3174cc79519bf5f6c4441780264416822c08"}, {"url": "https://git.kernel.org/stable/c/6e3987ac310c74bb4dd6a2fa8e46702fe505fb2b"}, {"url": "https://git.kernel.org/stable/c/bed2eb964c70b780fb55925892a74f26cb590b25"}], "title": "bpf: Fix a kernel verifier crash in stacksafe()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-09-29T15:48:14.999365Z", "id": "CVE-2024-45020", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-29T15:48:29.786Z"}}]}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/bpf/verifier.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "7cad3174cc79519bf5f6c4441780264416822c08", "status": "affected", "version": "ab470fefce2837e66b771c60858118d50bb5bb10", "versionType": "git"}, {"lessThan": "6e3987ac310c74bb4dd6a2fa8e46702fe505fb2b", "status": "affected", "version": "2793a8b015f7f1caadb9bce9c63dc659f7522676", "versionType": "git"}, {"lessThan": "bed2eb964c70b780fb55925892a74f26cb590b25", "status": "affected", "version": "2793a8b015f7f1caadb9bce9c63dc659f7522676", "versionType": "git"}, {"lessThan": "6.6.48", "status": "affected", "version": "6.6.15", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/bpf/verifier.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.7"}, {"lessThan": "6.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.48", "versionType": "semver"}, {"lessThanOrEqual": "6.10.*", "status": "unaffected", "version": "6.10.7", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.11", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "FE59A694-DE72-41A4-A18F-3B41532FCE94", "versionEndExcluding": "6.6.48", "versionStartIncluding": "6.6.15", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D2AFDFD1-D95A-4EB7-843B-5E7659518B67", "versionEndExcluding": "6.10.7", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:*", "matchCriteriaId": "8B3CE743-2126-47A3-8B7C-822B502CF119", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:*", "matchCriteriaId": "4DEB27E7-30AA-45CC-8934-B89263EF3551", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc3:*:*:*:*:*:*", "matchCriteriaId": "E0005AEF-856E-47EB-BFE4-90C46899394D", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix a kernel verifier crash in stacksafe()\n\nDaniel Hodges reported a kernel verifier crash when playing with sched-ext.\nFurther investigation shows that the crash is due to invalid memory access\nin stacksafe(). More specifically, it is the following code:\n\n if (exact != NOT_EXACT &&\n old->stack[spi].slot_type[i % BPF_REG_SIZE] !=\n cur->stack[spi].slot_type[i % BPF_REG_SIZE])\n return false;\n\nThe 'i' iterates old->allocated_stack.\nIf cur->allocated_stack < old->allocated_stack the out-of-bound\naccess will happen.\n\nTo fix the issue add 'i >= cur->allocated_stack' check such that if\nthe condition is true, stacksafe() should fail. Otherwise,\ncur->stack[spi].slot_type[i % BPF_REG_SIZE] memory access is legal."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: Se corrige un fallo del verificador del kernel en stacksafe() Daniel Hodges inform\u00f3 de un fallo del verificador del kernel al jugar con sched-ext. Una investigaci\u00f3n m\u00e1s profunda muestra que el fallo se debe a un acceso a memoria no v\u00e1lido en stacksafe(). M\u00e1s espec\u00edficamente, es el siguiente c\u00f3digo: if (exact != NOT_EXACT &amp;&amp; old-&gt;stack[spi].slot_type[i % BPF_REG_SIZE] != cur-&gt;stack[spi].slot_type[i % BPF_REG_SIZE]) return false; La 'i' itera old-&gt;allocated_stack. Si cur-&gt;allocated_stack &lt; old-&gt;allocated_stack, se producir\u00e1 el acceso fuera de l\u00edmites. Para solucionar el problema, agregue la comprobaci\u00f3n 'i &gt;= cur-&gt;allocated_stack' de modo que, si la condici\u00f3n es verdadera, stacksafe() deber\u00eda fallar. De lo contrario, el acceso a la memoria cur-&gt;stack[spi].slot_type[i % BPF_REG_SIZE] es legal."}], "id": "CVE-2024-45020", "lastModified": "2026-08-04T11:20:11.413", "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": 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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-45020", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-29T15:48:14.999365Z", "version": "2.0.3"}}]}, "published": "2024-09-11T16:15:07.050", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6e3987ac310c74bb4dd6a2fa8e46702fe505fb2b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7cad3174cc79519bf5f6c4441780264416822c08"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bed2eb964c70b780fb55925892a74f26cb590b25"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2024:11486", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.19.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-12-19T00:00:00Z"}, {"advisory": "RHSA-2024:11486", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.19.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-12-19T00:00:00Z"}], "bugzilla": {"description": "kernel: bpf: Fix a kernel verifier crash in stacksafe()", "id": "2311717", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2311717"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H", "status": "verified"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbpf: Fix a kernel verifier crash in stacksafe()\nDaniel Hodges reported a kernel verifier crash when playing with sched-ext.\nFurther investigation shows that the crash is due to invalid memory access\nin stacksafe(). More specifically, it is the following code:\nif (exact != NOT_EXACT &&\nold->stack[spi].slot_type[i % BPF_REG_SIZE] !=\ncur->stack[spi].slot_type[i % BPF_REG_SIZE])\nreturn false;\nThe 'i' iterates old->allocated_stack.\nIf cur->allocated_stack < old->allocated_stack the out-of-bound\naccess will happen.\nTo fix the issue add 'i >= cur->allocated_stack' check such that if\nthe condition is true, stacksafe() should fail. Otherwise,\ncur->stack[spi].slot_type[i % BPF_REG_SIZE] memory access is legal."], "name": "CVE-2024-45020", "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-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-09-11T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-45020\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-45020\nhttps://lore.kernel.org/linux-cve-announce/2024091108-CVE-2024-45020-afcc@gregkh/T"], "threat_severity": "Moderate"}

{}