CVE-2024-47703

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This is a constrained delegated privilege whose stated boundary is verifier soundness, not administrative control of the kernel.\nUI:N - The attacker performs every step in its own processes \u2014 load, attach, and then trigger with its own `open()` call. No victim action, mount, or file access by another user is required.\nS:U - Both the flawed component (BPF verifier return-value check) and the impacted component (VFS/kernel memory) are the kernel itself under a single security authority; no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - The unchecked positive return becomes an attacker-chosen `struct file *` in the `[1, 0x7FFFFFFF]` user range that `IS_ERR()` fails to reject, so a pre-mapped fake `struct file` with a controlled `f_op` yields arbitrary kernel-memory reads and disclosure; the verifier bypass also lets LSM access-control verdicts be forged, defeating confidentiality enforcement.\nI:H - A verifier-sanctioned out-of-contract return value hands the VFS a fully attacker-controlled `struct file`, the canonical primitive for arbitrary kernel write and control-flow hijack via `f_op` after `fd_install()`, and independently allows LSM allow/deny decisions to be forged.\nA:H - The commit message documents that a positive `file_alloc_security` return \"makes kernel panic\" because the filesystem dereferences it as a file pointer; any `open()` on the system then oopses, giving a trivially repeatable full denial of service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/bpf.h", "include/linux/bpf_lsm.h", "kernel/bpf/bpf_lsm.c", "kernel/bpf/btf.c", "kernel/bpf/verifier.c"], "versions": [{"version": "520b7aa00d8cd8e411ecc09f63a2acd90feb6d29", "lessThan": "1050727d83e70449991c29dd1cf29fe936a63da3", "status": "affected", "versionType": "git"}, {"version": "520b7aa00d8cd8e411ecc09f63a2acd90feb6d29", "lessThan": "27ca3e20fe80be85a92b10064dfeb56cb2564b1c", "status": "affected", "versionType": "git"}, {"version": "520b7aa00d8cd8e411ecc09f63a2acd90feb6d29", "lessThan": "5d99e198be279045e6ecefe220f5c52f8ce9bfd5", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/bpf.h", "include/linux/bpf_lsm.h", "kernel/bpf/bpf_lsm.c", "kernel/bpf/btf.c", "kernel/bpf/verifier.c"], "versions": [{"version": "5.7", "status": "affected"}, {"version": "0", "lessThan": "5.7", "status": "unaffected", "versionType": "semver"}, {"version": "6.10.13", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.11.2", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12", "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": "5.7", "versionEndExcluding": "6.10.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.11.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.12"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/1050727d83e70449991c29dd1cf29fe936a63da3"}, {"url": "https://git.kernel.org/stable/c/27ca3e20fe80be85a92b10064dfeb56cb2564b1c"}, {"url": "https://git.kernel.org/stable/c/5d99e198be279045e6ecefe220f5c52f8ce9bfd5"}], "title": "bpf, lsm: Add check for BPF LSM return value", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-47703", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-10-21T13:04:16.628163Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-21T13:14:13.303Z"}}]}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["include/linux/bpf.h", "include/linux/bpf_lsm.h", "kernel/bpf/bpf_lsm.c", "kernel/bpf/btf.c", "kernel/bpf/verifier.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "1050727d83e70449991c29dd1cf29fe936a63da3", "status": "affected", "version": "520b7aa00d8cd8e411ecc09f63a2acd90feb6d29", "versionType": "git"}, {"lessThan": "27ca3e20fe80be85a92b10064dfeb56cb2564b1c", "status": "affected", "version": "520b7aa00d8cd8e411ecc09f63a2acd90feb6d29", "versionType": "git"}, {"lessThan": "5d99e198be279045e6ecefe220f5c52f8ce9bfd5", "status": "affected", "version": "520b7aa00d8cd8e411ecc09f63a2acd90feb6d29", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["include/linux/bpf.h", "include/linux/bpf_lsm.h", "kernel/bpf/bpf_lsm.c", "kernel/bpf/btf.c", "kernel/bpf/verifier.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.7"}, {"lessThan": "5.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.10.*", "status": "unaffected", "version": "6.10.13", "versionType": "semver"}, {"lessThanOrEqual": "6.11.*", "status": "unaffected", "version": "6.11.2", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.12", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E1F96D11-7ACD-40CC-B672-1636AFCE5B49", "versionEndExcluding": "6.10.13", "versionStartIncluding": "5.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "AB755D26-97F4-43B6-8604-CD076811E181", "versionEndExcluding": "6.11.2", "versionStartIncluding": "6.11", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, lsm: Add check for BPF LSM return value\n\nA bpf prog returning a positive number attached to file_alloc_security\nhook makes kernel panic.\n\nThis happens because file system can not filter out the positive number\nreturned by the LSM prog using IS_ERR, and misinterprets this positive\nnumber as a file pointer.\n\nGiven that hook file_alloc_security never returned positive number\nbefore the introduction of BPF LSM, and other BPF LSM hooks may\nencounter similar issues, this patch adds LSM return value check\nin verifier, to ensure no unexpected value is returned."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf, lsm: Agregar comprobaci\u00f3n para el valor de retorno de BPF LSM Un programa bpf que devuelve un n\u00famero positivo adjunto al gancho file_alloc_security hace que el kernel entre en p\u00e1nico. Esto sucede porque el sistema de archivos no puede filtrar el n\u00famero positivo devuelto por el programa LSM usando IS_ERR y malinterpreta este n\u00famero positivo como un puntero de archivo. Dado que el gancho file_alloc_security nunca devolvi\u00f3 un n\u00famero positivo antes de la introducci\u00f3n de BPF LSM, y otros ganchos BPF LSM pueden encontrar problemas similares, este parche agrega la comprobaci\u00f3n del valor de retorno de LSM en el verificador, para garantizar que no se devuelva ning\u00fan valor inesperado."}], "id": "CVE-2024-47703", "lastModified": "2026-08-04T11:20:42.450", "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-2024-47703", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-10-21T13:04:16.628163Z", "version": "2.0.3"}}]}, "published": "2024-10-21T12:15:06.823", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1050727d83e70449991c29dd1cf29fe936a63da3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/27ca3e20fe80be85a92b10064dfeb56cb2564b1c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5d99e198be279045e6ecefe220f5c52f8ce9bfd5"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2025:6966", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}, {"advisory": "RHSA-2025:6966", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}], "bugzilla": {"description": "kernel: bpf, lsm: Add check for BPF LSM return value", "id": "2320249", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2320249"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-681", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbpf, lsm: Add check for BPF LSM return value\nA bpf prog returning a positive number attached to file_alloc_security\nhook makes kernel panic.\nThis happens because file system can not filter out the positive number\nreturned by the LSM prog using IS_ERR, and misinterprets this positive\nnumber as a file pointer.\nGiven that hook file_alloc_security never returned positive number\nbefore the introduction of BPF LSM, and other BPF LSM hooks may\nencounter similar issues, this patch adds LSM return value check\nin verifier, to ensure no unexpected value is returned."], "name": "CVE-2024-47703", "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": "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": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-10-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-47703\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-47703\nhttps://lore.kernel.org/linux-cve-announce/2024102115-CVE-2024-47703-36ea@gregkh/T"], "statement": "The default Red Hat Enterprise Linux kernel prevents unprivileged users from being able to use eBPF by the kernel.unprivileged_bpf_disabled sysctl. This would require a privileged user with CAP_SYS_ADMIN or root to be able to abuse this flaw reducing its attack space.\nFor the Red Hat Enterprise Linux 9 to confirm the current state, inspect the sysctl with the command:\ncat /proc/sys/kernel/unprivileged_bpf_disabled\nThe setting of 1 would mean that unprivileged users can not use eBPF, mitigating the flaw.", "threat_severity": "Moderate"}

{}