CVE-2025-38003

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No remote or adjacent network path reaches the racing procfs reader.\nAC:L - The attacker controls both sides of the race entirely \u2014 one thread loops reading the procfs entry while another loops RX_SETUP/RX_DELETE \u2014 and bcm_proc_show() held no lock whatsoever against the deleter, so the window is hit reliably by simple repetition; a working PoC was produced by the reporter for this bcm series.\nPR:L - can_create() performs no capability check, connect() with ifindex 0 needs no CAN device, and the created proc entry is mode 0644, so any unprivileged local user can drive the whole sequence in its own process (module autoload of can/can-bcm is also unprivileged).\nUI:N - The attacker performs every step itself \u2014 socket setup, op deletion, and reading its own procfs file \u2014 with no action by any other user.\nS:U - The freed object, the disclosure, and the crash are all within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Fields are read from a freed bcm_op and formatted directly into world-readable procfs output; since bcm_op lands in the sprayable kmalloc-512 cache, an attacker reclaiming it controls the list cursor and can steer the walk to arbitrary kernel addresses, leaking their contents to userspace.\nI:H - This is a use-after-free on an attacker-reclaimable slab object whose linkage pointers are dereferenced after free, a primitive that combined with heap grooming is leveraged for kernel state corruption and control-flow influence.\nA:H - A concurrent plain list_del() leaves LIST_POISON1 in the cursor, so the unprotected walker dereferences a non-canonical/freed pointer and oopses; the walk can also spin over reclaimed memory or hit a divide-by-zero on a re-read frames_abs, crashing or hanging the kernel."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/can/bcm.c"], 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Cuando se genera el contenido de procfs para un bcm_op que se va a eliminar, la salida de procfs podr\u00eda mostrar datos no fiables (UAF). Dado que la eliminaci\u00f3n de bcm_op ya est\u00e1 implementada con la gesti\u00f3n de rcu, este parche a\u00f1ade el rcu_read_lock() faltante y garantiza que las entradas de la lista se eliminen correctamente bajo la protecci\u00f3n de rcu."}], "id": "CVE-2025-38003", "lastModified": "2026-07-30T06:22:43.890", "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"}]}, "published": "2025-06-08T11:15:20.990", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0622846db728a5332b917c797c733e202c4620ae"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/19f553a1ddf260da6570ed8f8d91a8c87f49b63a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1f912f8484e9c4396378c39460bbea0af681f319"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/63567ecd99a24495208dc860d50fb17440043006"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/659701c0b954ccdb4a916a4ad59bbc16e726d42c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6d7d458c41b98a5c1670cbd36f2923c37de51cf5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7c9db92d5f0eadca30884af75c53d601edc512ee"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dac5e6249159ac255dad9781793dbe5908ac9ddb"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}], "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: can: bcm: add missing rcu read protection for procfs content", "id": "2370993", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2370993"}, "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"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncan: bcm: add missing rcu read protection for procfs content\nWhen the procfs content is generated for a bcm_op which is in the process\nto be removed the procfs output might show unreliable data (UAF).\nAs the removal of bcm_op's is already implemented with rcu handling this\npatch adds the missing rcu_read_lock() and makes sure the list entries\nare properly removed under rcu protection."], "name": "CVE-2025-38003", "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": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-06-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38003\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38003\nhttps://lore.kernel.org/linux-cve-announce/2025060859-CVE-2025-38003-6565@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-06-24T09:51:37.575443+00:00", "updated": "2025-06-24T09:51:37.575492+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}