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Esta funci\u00f3n utiliza skb_cow_head() para garantizar que haya suficiente espacio libre en sk_buff para acomodar el encabezado de la capa de enlace. En caso de que la funci\u00f3n skb_cow_header() falle, seg6_input_core() detecta el error pero no libera sk_buff, lo que provocar\u00e1 una p\u00e9rdida de memoria. Este problema se introdujo en el commit af3b5158b89d (\"ipv6: sr: corrige el ERROR debido a un espacio libre demasiado peque\u00f1o despu\u00e9s de la inserci\u00f3n de SRH\") y persiste incluso despu\u00e9s de el commit 7a3f5b0de364 (\"netfilter: agregue enlaces de netfilter al plano de datos SRv6\"), donde todo el seg6_input( ) el c\u00f3digo fue refactorizado para lidiar con los ganchos de netfilter. El parche propuesto aborda la p\u00e9rdida de memoria identificada al requerir que la funci\u00f3n seg6_input_core() libere sk_buff en caso de que skb_cow_head() falle."}], "id": "CVE-2024-39490", "lastModified": "2025-03-24T17:23:25.253", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 6.2, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2024-07-10T08:15:11.203", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5447f9708d9e4c17a647b16a9cb29e9e02820bd9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8f1fc3b86eaea70be6abcae2e9aa7e7b99453864"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e8688218e38111ace457509d8f0cad75f79c1a7a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f4df8c7670a73752201cbde215254598efdf6ce8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f5fec1588642e415a3d72e02140160661b303940"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5447f9708d9e4c17a647b16a9cb29e9e02820bd9"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8f1fc3b86eaea70be6abcae2e9aa7e7b99453864"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e8688218e38111ace457509d8f0cad75f79c1a7a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f4df8c7670a73752201cbde215254598efdf6ce8"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f5fec1588642e415a3d72e02140160661b303940"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: ipv6: sr: fix missing sk_buff release in seg6_input_core", "id": "2297060", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2297060"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nipv6: sr: fix missing sk_buff release in seg6_input_core\nThe seg6_input() function is responsible for adding the SRH into a\npacket, delegating the operation to the seg6_input_core(). This function\nuses the skb_cow_head() to ensure that there is sufficient headroom in\nthe sk_buff for accommodating the link-layer header.\nIn the event that the skb_cow_header() function fails, the\nseg6_input_core() catches the error but it does not release the sk_buff,\nwhich will result in a memory leak.\nThis issue was introduced in commit af3b5158b89d (\"ipv6: sr: fix BUG due\nto headroom too small after SRH push\") and persists even after commit\n7a3f5b0de364 (\"netfilter: add netfilter hooks to SRv6 data plane\"),\nwhere the entire seg6_input() code was refactored to deal with netfilter\nhooks.\nThe proposed patch addresses the identified memory leak by requiring the\nseg6_input_core() function to release the sk_buff in the event that\nskb_cow_head() fails."], "name": "CVE-2024-39490", "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": "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": "2024-07-10T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-39490\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-39490\nhttps://lore.kernel.org/linux-cve-announce/2024071016-CVE-2024-39490-9fc3@gregkh/T"], "threat_severity": "Moderate"}

{}