CVE-2021-47235

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It can cause use-after-free when accessing priv\npointer. So, fix it by moving free_netdev() after pci_iounmap()\ncalls."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/ec_bhf.c"], "versions": [{"version": "6af55ff52b02d492d45db88df3e461fa51a6f753", "lessThan": "db2bc3cfd2bc01621014d4f17cdfc74611f339c8", "status": "affected", "versionType": "git"}, {"version": "6af55ff52b02d492d45db88df3e461fa51a6f753", "lessThan": "1cafc540b7bf1b6a5a77dc000205fe337ef6eba6", "status": "affected", "versionType": "git"}, {"version": "6af55ff52b02d492d45db88df3e461fa51a6f753", "lessThan": "b1ad283755095a4b9d1431aeb357d7df1a33d3bb", "status": "affected", "versionType": "git"}, {"version": "6af55ff52b02d492d45db88df3e461fa51a6f753", "lessThan": "0260916843cc74f3906acf8b6f256693e01530a2", "status": "affected", "versionType": "git"}, {"version": "6af55ff52b02d492d45db88df3e461fa51a6f753", "lessThan": 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It can cause use-after-free when accessing priv\npointer. 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true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc6:*:*:*:*:*:*", "matchCriteriaId": "25A855BA-2118-44F2-90EF-EBBB12AF51EF", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ethernet: fix potential use-after-free in ec_bhf_remove\n\nstatic void ec_bhf_remove(struct pci_dev *dev)\n{\n...\n\tstruct ec_bhf_priv *priv = netdev_priv(net_dev);\n\n\tunregister_netdev(net_dev);\n\tfree_netdev(net_dev);\n\n\tpci_iounmap(dev, priv->dma_io);\n\tpci_iounmap(dev, priv->io);\n...\n}\n\npriv is netdev private data, but it is used\nafter free_netdev(). It can cause use-after-free when accessing priv\npointer. So, fix it by moving free_netdev() after pci_iounmap()\ncalls."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: ethernet: soluciona el posible use after free en ec_bhf_remove static void ec_bhf_remove(struct pci_dev *dev) { ... struct ec_bhf_priv *priv = netdev_priv(net_dev); anular el registro_netdev(net_dev); free_netdev(net_dev); pci_iounmap(dev, priv->dma_io); pci_iounmap(dev, priv->io); ... } priv son datos privados de netdev, pero se usan despu\u00e9s de free_netdev(). Puede causar use after free al acceder al puntero privado. Entonces, solucionelo moviendo free_netdev() despu\u00e9s de las llamadas a pci_iounmap()."}], "id": "CVE-2021-47235", "lastModified": "2026-06-17T04:16:58.423", "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": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47235", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-06-17T17:38:04.934934Z", "version": "2.0.3"}}]}, "published": "2024-05-21T15:15:12.777", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0260916843cc74f3906acf8b6f256693e01530a2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/19f88ca68ccf8771276a606765239b167654f84a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1cafc540b7bf1b6a5a77dc000205fe337ef6eba6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/95deeb29d831e2fae608439e243e7a520611e7ea"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9cca0c2d70149160407bda9a9446ce0c29b6e6c6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b1ad283755095a4b9d1431aeb357d7df1a33d3bb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d11d79e52ba080ee567cb7d7eb42a5ade60a8130"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/db2bc3cfd2bc01621014d4f17cdfc74611f339c8"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0260916843cc74f3906acf8b6f256693e01530a2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/19f88ca68ccf8771276a606765239b167654f84a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1cafc540b7bf1b6a5a77dc000205fe337ef6eba6"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/95deeb29d831e2fae608439e243e7a520611e7ea"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9cca0c2d70149160407bda9a9446ce0c29b6e6c6"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b1ad283755095a4b9d1431aeb357d7df1a33d3bb"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d11d79e52ba080ee567cb7d7eb42a5ade60a8130"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/db2bc3cfd2bc01621014d4f17cdfc74611f339c8"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: ethernet: fix potential use-after-free in ec_bhf_remove", "id": "2282582", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282582"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: ethernet: fix potential use-after-free in ec_bhf_remove\nstatic void ec_bhf_remove(struct pci_dev *dev)\n{\n...\nstruct ec_bhf_priv *priv = netdev_priv(net_dev);\nunregister_netdev(net_dev);\nfree_netdev(net_dev);\npci_iounmap(dev, priv->dma_io);\npci_iounmap(dev, priv->io);\n...\n}\npriv is netdev private data, but it is used\nafter free_netdev(). It can cause use-after-free when accessing priv\npointer. So, fix it by moving free_netdev() after pci_iounmap()\ncalls.", "A use-after-free vulnerability has been identified in the Linux kernel's Ethernet driver, specifically within the ec_bhf_remove() function. This flaw occurs when the function attempts to utilize a pointer to private data after the associated network device object has already been deallocated. This leads to a use-after-free condition. Successful exploitation of this vulnerability could result in unpredictable system behavior or a kernel-level crash, impacting system availability."], "mitigation": {"lang": "en:us", "value": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible."}, "name": "CVE-2021-47235", "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": "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": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47235\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47235\nhttps://lore.kernel.org/linux-cve-announce/2024052140-CVE-2021-47235-1fb6@gregkh/T"], "statement": "None of the products shipped by Red Hat are affected by this vulnerability.", "threat_severity": "Moderate"}

{}