CVE-2026-64222

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The CN20K-specific\ncn20k_pool_aq_init() implementation has the same bug in\nits corresponding error path.\n\nSet pool->stack to NULL immediately after the local free so the shared\ncleanup path does not free the same stack again while cleaning up\npartially initialized pool state.\n\nThe bug was first flagged by an experimental analysis tool we are\ndeveloping for kernel memory-management bugs while analyzing\nv6.13-rc1. The tool is still under development and is not yet publicly\navailable. Manual inspection confirms that the bug is still present in\nv7.1-rc3.\n\nRuntime validation was not performed because reproducing this path\nrequires OcteonTX2/CN20K hardware."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable initialization is reached through local netdevice operations such as RTM_SETLINK or ethtool reconfiguration, ultimately invoking ndo_open; received network packets do not directly reach it.\nAC:H - The attacker can fill the fixed mailbox by configuring many queues, but exploitation additionally requires an AF/NPA synchronization error or timeout. Legitimate mailbox users are serialized, so this failure is not reliably attacker-controlled.\nPR:L - CAP_NET_ADMIN is required in the device's owning network namespace. OcteonTX2 VFs can reasonably be delegated to a user-owned network namespace, where namespace-level administration suffices without initial-namespace root.\nUI:N - The attacker can initiate the interface-open or reconfiguration operation directly, without action by another user.\nS:U - The double free corrupts the kernel managing the affected PF or VF but does not inherently cross a VM, IOMMU, or separate security-authority boundary.\nC:H - The repeated release of coherent DMA pages can create overlapping allocations, while the stale qmem object can also be reclaimed and its DMA metadata influenced. This memory corruption can plausibly expose arbitrary kernel memory.\nI:H - Double-freeing DMA-backed pages can corrupt the page allocator and produce overlapping ownership, enabling arbitrary kernel-memory modification or control-flow hijacking.\nA:H - The double DMA/page release can immediately cause allocator warnings, an oops, or a kernel panic, and corrupted allocator state can crash the system later."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/marvell/octeontx2/nic/cn20k.c", "drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c"], "versions": [{"version": "caa2da34fd25a37e9fd43343b6966fb9d730a6d5", "lessThan": "e6e9bc0bf963662b7042048ab0281014625d4cb4", "status": "affected", "versionType": "git"}, {"version": "caa2da34fd25a37e9fd43343b6966fb9d730a6d5", "lessThan": "b92e7ea408b6f1144648909c9c49a55d245d7300", "status": 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"https://git.kernel.org/stable/c/0d9b9d7dbef976ae7f855b6358f1d703014e96ea"}, {"url": "https://git.kernel.org/stable/c/c4b8c5d51632538b19ee01cf6d70cbceeefbd3ec"}, {"url": "https://git.kernel.org/stable/c/9b244c242bec48b37e82b89787afd6a4c43457e1"}], "title": "octeontx2-pf: avoid double free of pool->stack on AQ init failure", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-64222", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:37:38.314556Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-415", "description": "CWE-415 Double Free"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:28:15.732Z"}}]}}

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This memory corruption can plausibly expose arbitrary kernel memory.\nI:H - Double-freeing DMA-backed pages can corrupt the page allocator and produce overlapping ownership, enabling arbitrary kernel-memory modification or control-flow hijacking.\nA:H - The double DMA/page release can immediately cause allocator warnings, an oops, or a kernel panic, and corrupted allocator state can crash the system later."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "caa2da34fd25a37e9fd43343b6966fb9d730a6d5", "lessThan": "e6e9bc0bf963662b7042048ab0281014625d4cb4", "versionType": "git"}, {"status": "affected", "version": "caa2da34fd25a37e9fd43343b6966fb9d730a6d5", "lessThan": "b92e7ea408b6f1144648909c9c49a55d245d7300", "versionType": "git"}, {"status": "affected", "version": "caa2da34fd25a37e9fd43343b6966fb9d730a6d5", "lessThan": "94192b0579333c3deee2441379aab8ca98fc2e6b", "versionType": "git"}, {"status": "affected", "version": "caa2da34fd25a37e9fd43343b6966fb9d730a6d5", "lessThan": "4c29603498b05c049dbbbc47e882f2fbf0193cd7", "versionType": "git"}, {"status": "affected", "version": "caa2da34fd25a37e9fd43343b6966fb9d730a6d5", "lessThan": "0488a0bb344fb1992853b60082acff6be8164d74", "versionType": "git"}, {"status": "affected", "version": "caa2da34fd25a37e9fd43343b6966fb9d730a6d5", "lessThan": "0d9b9d7dbef976ae7f855b6358f1d703014e96ea", "versionType": "git"}, {"status": "affected", "version": "caa2da34fd25a37e9fd43343b6966fb9d730a6d5", "lessThan": "c4b8c5d51632538b19ee01cf6d70cbceeefbd3ec", "versionType": "git"}, {"status": "affected", "version": "caa2da34fd25a37e9fd43343b6966fb9d730a6d5", "lessThan": "9b244c242bec48b37e82b89787afd6a4c43457e1", "versionType": "git"}], "programFiles": ["drivers/net/ethernet/marvell/octeontx2/nic/cn20k.c", "drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.6"}, {"status": "unaffected", "version": "0", "lessThan": "5.6", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.259", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.210", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.176", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.143", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.93", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.35", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.11", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/net/ethernet/marvell/octeontx2/nic/cn20k.c", "drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/e6e9bc0bf963662b7042048ab0281014625d4cb4"}, {"url": "https://git.kernel.org/stable/c/b92e7ea408b6f1144648909c9c49a55d245d7300"}, {"url": "https://git.kernel.org/stable/c/94192b0579333c3deee2441379aab8ca98fc2e6b"}, {"url": "https://git.kernel.org/stable/c/4c29603498b05c049dbbbc47e882f2fbf0193cd7"}, {"url": "https://git.kernel.org/stable/c/0488a0bb344fb1992853b60082acff6be8164d74"}, {"url": "https://git.kernel.org/stable/c/0d9b9d7dbef976ae7f855b6358f1d703014e96ea"}, {"url": "https://git.kernel.org/stable/c/c4b8c5d51632538b19ee01cf6d70cbceeefbd3ec"}, {"url": "https://git.kernel.org/stable/c/9b244c242bec48b37e82b89787afd6a4c43457e1"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocteontx2-pf: avoid double free of pool->stack on AQ init failure\n\notx2_pool_aq_init() frees pool->stack when mailbox sync or retry\nallocation fails, but leaves the pointer unchanged. 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Later,\notx2_sq_aura_pool_init() unwinds the partial setup through\notx2_aura_pool_free(), which frees pool->stack again. The CN20K-specific\ncn20k_pool_aq_init() implementation has the same bug in\nits corresponding error path.\n\nSet pool->stack to NULL immediately after the local free so the shared\ncleanup path does not free the same stack again while cleaning up\npartially initialized pool state.\n\nThe bug was first flagged by an experimental analysis tool we are\ndeveloping for kernel memory-management bugs while analyzing\nv6.13-rc1. The tool is still under development and is not yet publicly\navailable. Manual inspection confirms that the bug is still present in\nv7.1-rc3.\n\nRuntime validation was not performed because reproducing this path\nrequires OcteonTX2/CN20K hardware."}], "id": "CVE-2026-64222", "lastModified": "2026-10-19T21:17:27.463", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64222", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:37:38.314556Z", "version": "2.0.3"}}]}, "published": "2026-07-24T16:16:50.053", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0488a0bb344fb1992853b60082acff6be8164d74"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0d9b9d7dbef976ae7f855b6358f1d703014e96ea"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4c29603498b05c049dbbbc47e882f2fbf0193cd7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/94192b0579333c3deee2441379aab8ca98fc2e6b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9b244c242bec48b37e82b89787afd6a4c43457e1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b92e7ea408b6f1144648909c9c49a55d245d7300"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c4b8c5d51632538b19ee01cf6d70cbceeefbd3ec"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e6e9bc0bf963662b7042048ab0281014625d4cb4"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-415"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-415"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: octeontx2-pf: avoid double free of pool->stack on AQ init failure", "id": "2506817", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506817"}, "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"}, "cwe": "CWE-1341", "details": ["A flaw was found in the Linux kernel's octeontx2-pf driver. This vulnerability involves a double free of memory during the initialization of the Accelerated Queue (AQ) when an error occurs. Specifically, the `pool->stack` memory is freed twice, which can lead to memory corruption. A local attacker could potentially exploit this to cause system instability or a denial of service (DoS)."], "name": "CVE-2026-64222", "public_date": "2026-07-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64222\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64222\nhttps://lore.kernel.org/linux-cve-announce/2026072416-CVE-2026-64222-ee5a@gregkh/T"], "threat_severity": "Moderate"}

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