CVE-2026-43304

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A malicious or compromised Ceph endpoint can supply the crafted AUTH_DONE payload over the network.\nAC:L - Once the attacker can act as the responding Ceph peer, the oversized decoded session key is a deterministic protocol field and no race or hard-to-control condition is required. The stack overwrite follows directly from the key length accepted before the fix.\nPR:N - The attacker needs no local privileges on the victim kernel; the code is reached during the network authentication handshake before the connection is fully established. Even though CephX payloads are cryptographic, a malicious configured/compromised peer can trigger the path remotely.\nUI:N - No interactive victim action is required once the vulnerable client connects to the Ceph peer as part of normal operation. The malicious AUTH_DONE response is processed automatically by the kernel client.\nS:U - The impact is compromise or crash of the same kernel/client security authority that contains the vulnerable libceph code. This is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:H - The bug is attacker-controlled kernel stack memory corruption from copying an unchecked session key into a fixed-size stack buffer. Such memory corruption can reasonably be leveraged for sensitive kernel memory disclosure.\nI:H - The unchecked memcpy can overwrite adjacent kernel stack state with attacker-controlled key bytes. This is an out-of-bounds write with plausible control-flow or data corruption impact.\nA:H - The stack overflow can corrupt kernel execution state and cause an oops or panic. 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A malicious or compromised Ceph endpoint can supply the crafted AUTH_DONE payload over the network.\nAC:L - Once the attacker can act as the responding Ceph peer, the oversized decoded session key is a deterministic protocol field and no race or hard-to-control condition is required. The stack overwrite follows directly from the key length accepted before the fix.\nPR:N - The attacker needs no local privileges on the victim kernel; the code is reached during the network authentication handshake before the connection is fully established. Even though CephX payloads are cryptographic, a malicious configured/compromised peer can trigger the path remotely.\nUI:N - No interactive victim action is required once the vulnerable client connects to the Ceph peer as part of normal operation. 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{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "851E9353-6C09-4CC9-877E-E09DB164A3C2", "versionEndExcluding": "6.6.128", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "BCE16369-98ED-41CF-8995-DFDC10B288D2", "versionEndExcluding": "6.12.75", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B", "versionEndExcluding": "6.18.16", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67", "versionEndExcluding": "6.19.6", "versionStartIncluding": "6.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: define and enforce CEPH_MAX_KEY_LEN\n\nWhen decoding the key, verify that the key material would fit into\na fixed-size buffer in process_auth_done() and generally has a sane\nlength.\n\nThe new CEPH_MAX_KEY_LEN check replaces the existing check for a key\nwith no key material which is a) not universal since CEPH_CRYPTO_NONE\nhas to be excluded and b) doesn't provide much value since a smaller\nthan needed key is just as invalid as no key -- this has to be handled\nelsewhere anyway."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nlibceph: define y aplica CEPH_MAX_KEY_LEN\n\nAl decodificar la clave, verifica que el material de la clave cabr\u00eda en un b\u00fafer de tama\u00f1o fijo en process_auth_done() y generalmente tiene una longitud sensata.\n\nLa nueva verificaci\u00f3n de CEPH_MAX_KEY_LEN reemplaza la verificaci\u00f3n existente para una clave sin material de clave que es a) no universal ya que CEPH_CRYPTO_NONE debe ser excluido y b) no proporciona mucho valor ya que una clave m\u00e1s peque\u00f1a de lo necesario es tan inv\u00e1lida como ninguna clave -- esto debe manejarse en otro lugar de todos modos."}], "id": "CVE-2026-43304", "lastModified": "2026-11-11T20:10:00.273", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43304", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:16:20.550708Z", "version": "2.0.3"}}]}, "published": "2026-05-08T14:16:37.693", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1b275bd49e58752efb83767a5d1aed41356c5e64"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6405e8c680974bb74e2c98d5249fb52c7b12a6c6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8d745d38c88ecbed95f6b2b39857bf89f35a3244"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ac431d597a9bdfc2ba6b314813f29a6ef2b4a3bf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c1a0f5f1e5e7e98c36a362ec3d1fcfd9932931ed"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d82467c07b03a27c3c5469b62bb3b726305a80bb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e1dc45d97975f9db65694d234fbddf1915176e16"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-121"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: libceph: define and enforce CEPH_MAX_KEY_LEN", "id": "2468062", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468062"}, "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"}, "cwe": "CWE-1284", "details": ["A flaw was found in the `libceph` component of the Linux kernel. This vulnerability occurs when the kernel processes authentication keys, specifically in the `process_auth_done()` function, where it fails to properly enforce a maximum length for key material. An attacker could exploit this by providing an overly long key, potentially leading to a buffer overflow. This could result in a denial of service (DoS) or other unpredictable system behavior."], "name": "CVE-2026-43304", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "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": "2026-05-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43304\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43304\nhttps://lore.kernel.org/linux-cve-announce/2026050857-CVE-2026-43304-a225@gregkh/T"], "threat_severity": "Important"}

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