CVE-2026-64118

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The tool is still under development and is not yet publicly\navailable. Manual inspection confirms that the bug is still\npresent in v7.1-rc3.\n\nRuntime reproduction was not attempted because exercising the failing\nallocation path requires device-specific setup."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.4, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable code runs only during PF driver resource initialization (probe or firmware-initiated recovery), reached via local kernel driver bring-up paths rather than network packet processing or remote protocol handlers.\nAC:L - An attacker who can influence system memory pressure (e.g., via local memory exhaustion) can reliably force `bitmap_zalloc()` failures during the multi-step CID bitmap allocation loop, and can also time this with firmware recovery reprobes that re-enter `qed_resc_alloc()`.\nPR:N - No local account or capability is strictly required if a remote attacker can induce firmware process-kill recovery on an internet-facing QED host, causing automatic re-execution of `qed_resc_alloc()` where post-incident memory pressure can trigger the failing allocation path.\nUI:N - Exploitation does not require any victim user action such as opening files or mounting filesystems; driver recovery and re-allocation occur automatically in kernel context once the error/recovery conditions are met.\nS:U - Impact is confined to kernel heap corruption and potential privilege escalation within the same kernel security boundary, not a cross-authority escape such as VM breakout or IOMMU bypass.\nC:H - A double-free of kmalloc-allocated CID bitmap objects corrupts the kernel slab allocator state, which is classically leverageable for arbitrary kernel memory disclosure through heap manipulation primitives.\nI:H - Slab double-free is a standard heap corruption primitive that can be developed into arbitrary kernel writes and control-flow hijacking, not merely a bounded or cosmetic modification.\nA:H - Double-free during driver initialization can cause immediate kernel oops/panic from allocator corruption, and repeated recovery attempts on production QED hardware can produce sustained denial of service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/qlogic/qed/qed_cxt.c"], "versions": [{"version": "fe56b9e6a8d957d6a20729d626027f800c17a2da", "lessThan": "9fe030719bd083b766602692ee96c8c985798e3c", "status": "affected", "versionType": "git"}, {"version": "fe56b9e6a8d957d6a20729d626027f800c17a2da", "lessThan": "06fa8e69019fd3c41a7b0ea8c5f509c3a33dc227", "status": "affected", "versionType": "git"}, {"version": "fe56b9e6a8d957d6a20729d626027f800c17a2da", "lessThan": "8cf5e4d2ca6b101d163c7423a426fb0aec34f7bb", "status": "affected", "versionType": "git"}, {"version": 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following vulnerability has been resolved:\n\nqed: fix double free in qed_cxt_tables_alloc()\n\nIf one of the later PF or VF CID bitmap allocations fails,\nqed_cid_map_alloc() jumps to cid_map_fail and frees the previously\nallocated CID bitmaps before returning an error. qed_cxt_tables_alloc()\nthen calls qed_cxt_mngr_free(), which invokes qed_cid_map_free()\nagain.\n\nFix this by setting each CID bitmap pointer to NULL after bitmap_free()\nto avoid double free.\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\npresent in v7.1-rc3.\n\nRuntime reproduction was not attempted because exercising the failing\nallocation path requires device-specific setup."}], "id": "CVE-2026-64118", "lastModified": "2026-10-19T21:17:24.603", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64118", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:36:40.630775Z", "version": "2.0.3"}}]}, "published": "2026-07-19T16:17:53.320", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/06fa8e69019fd3c41a7b0ea8c5f509c3a33dc227"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0e47fc1c9181ae029e0e35a865cbf2adcbae626c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2bccfb8476ca5f3548afbd623dc7a6980d4e77de"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3904b993cc17ec5d7c5d3b57dbd0b775dafb9684"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8cf5e4d2ca6b101d163c7423a426fb0aec34f7bb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9fe030719bd083b766602692ee96c8c985798e3c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a04c207f0801abdd23a169b5f902a9845059a65a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bdf678a273cadbccc347f331ae2e93ff4d14834c"}], "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: qed: fix double free in qed_cxt_tables_alloc()", "id": "2502520", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502520"}, "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": ["In the Linux kernel, the following vulnerability has been resolved:\nqed: fix double free in qed_cxt_tables_alloc()\nIf one of the later PF or VF CID bitmap allocations fails,\nqed_cid_map_alloc() jumps to cid_map_fail and frees the previously\nallocated CID bitmaps before returning an error. qed_cxt_tables_alloc()\nthen calls qed_cxt_mngr_free(), which invokes qed_cid_map_free()\nagain.\nFix this by setting each CID bitmap pointer to NULL after bitmap_free()\nto avoid double free.\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\npresent in v7.1-rc3.\nRuntime reproduction was not attempted because exercising the failing\nallocation path requires device-specific setup.", "A flaw was found in the Linux kernel's qed driver. This vulnerability involves a double free error in the `qed_cxt_tables_alloc()` function, where memory is deallocated twice if a Connection ID (CID) bitmap allocation fails. This can lead to memory corruption, potentially allowing a local attacker to cause a system crash (denial of service) or execute unauthorized code."], "name": "CVE-2026-64118", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "impact": "important", "package_name": "erlang27", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64118\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64118\nhttps://lore.kernel.org/linux-cve-announce/2026071924-CVE-2026-64118-bbfe@gregkh/T"], "threat_severity": "Moderate"}

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