CVE-2026-74404

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no race or attacker-uncontrollable timing is required, only a firmware memory map with \u2265256 matching reserved/ACPI/PMEM iomem regions.\nPR:L - Exploitation requires local hypervisor access to create an SNP-capable KVM VM and issue KVM_SEV_INIT2 (typical /dev/kvm or kvm-group hypervisor operator), not unauthenticated remote access; comparable KVM ioctl CVEs in this repo score this as low privilege rather than init-namespace root only.\nUI:N - No victim interaction is needed beyond the attacker (or boot sequence) invoking SNP platform initialization; the bug fires automatically while enumerating the system iomem map during SNP_INIT_EX setup.\nS:U - The corruption occurs in host kernel heap memory during hypervisor SEV-SNP platform initialization by a host-side caller; it is not a guest-to-host VM escape, IOMMU/DMA bypass, or cross-authority sandbox breakout.\nC:H - The off-by-one permits a 4-byte out-of-bounds write of page_count past a PAGE_SIZE kzalloc buffer, corrupting adjacent kmalloc slab memory in ways that can be leveraged for kernel information disclosure.\nI:H - A controlled heap buffer overflow (even 4 bytes) can corrupt adjacent kernel objects and be developed into arbitrary kernel memory writes or control-flow hijacking, satisfying high integrity impact per kernel OOB-write guidance.\nA:H - Heap metadata/object corruption during SNP_INIT_EX can cause kernel oops/panic or leave the host in a failed state, especially on confidential-computing servers where SNP initialization is on the critical boot/VM-launch path."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/crypto/ccp/sev-dev.c"], "versions": [{"version": "1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2", "lessThan": "830c1f3e71989448652973375ef5e39b6ede47a3", "status": "affected", "versionType": "git"}, {"version": "1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2", "lessThan": "c5c79d92da0f9a09f48be5e2aabed2d6d1a96294", "status": "affected", "versionType": "git"}, {"version": "1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2", "lessThan": "af7341616b742ad2c374a90998bd650a035f694d", "status": "affected", "versionType": "git"}, {"version": "1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2", "lessThan": "1b864b6cb213bbd7b406e9b2e98c962077f300df", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/crypto/ccp/sev-dev.c"], "versions": [{"version": "6.9", "status": "affected"}, {"version": "0", "lessThan": "6.9", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/830c1f3e71989448652973375ef5e39b6ede47a3"}, {"url": "https://git.kernel.org/stable/c/c5c79d92da0f9a09f48be5e2aabed2d6d1a96294"}, {"url": "https://git.kernel.org/stable/c/af7341616b742ad2c374a90998bd650a035f694d"}, {"url": "https://git.kernel.org/stable/c/1b864b6cb213bbd7b406e9b2e98c962077f300df"}], "title": "crypto: ccp - Fix snp_filter_reserved_mem_regions() off-by-one", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74404", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T18:55:44.374861Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:05:43.034Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74404", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T18:55:44.374861Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T18:55:45.619Z"}}], "cna": {"title": "crypto: ccp - Fix snp_filter_reserved_mem_regions() off-by-one", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - The overflow is reached only via local host paths\u2014KVM VM ioctl KVM_SEV_INIT2 (sev_guest_init2\u2192sev_platform_init\u2192__sev_snp_init_locked) or kernel boot-time SEV-SNP platform init\u2014not through any network, Bluetooth, or physical bus handler.\nAC:L - Once on an AMD SEV-SNP host with SNP firmware \u22651.52, a caller can deterministically trigger SNP_INIT_EX initialization via KVM_SEV_INIT2; no race or attacker-uncontrollable timing is required, only a firmware memory map with \u2265256 matching reserved/ACPI/PMEM iomem regions.\nPR:L - Exploitation requires local hypervisor access to create an SNP-capable KVM VM and issue KVM_SEV_INIT2 (typical /dev/kvm or kvm-group hypervisor operator), not unauthenticated remote access; comparable KVM ioctl CVEs in this repo score this as low privilege rather than init-namespace root only.\nUI:N - No victim interaction is needed beyond the attacker (or boot sequence) invoking SNP platform initialization; the bug fires automatically while enumerating the system iomem map during SNP_INIT_EX setup.\nS:U - The corruption occurs in host kernel heap memory during hypervisor SEV-SNP platform initialization by a host-side caller; it is not a guest-to-host VM escape, IOMMU/DMA bypass, or cross-authority sandbox breakout.\nC:H - The off-by-one permits a 4-byte out-of-bounds write of page_count past a PAGE_SIZE kzalloc buffer, corrupting adjacent kmalloc slab memory in ways that can be leveraged for kernel information disclosure.\nI:H - A controlled heap buffer overflow (even 4 bytes) can corrupt adjacent kernel objects and be developed into arbitrary kernel memory writes or control-flow hijacking, satisfying high integrity impact per kernel OOB-write guidance.\nA:H - Heap metadata/object corruption during SNP_INIT_EX can cause kernel oops/panic or leave the host in a failed state, especially on confidential-computing servers where SNP initialization is on the critical boot/VM-launch path."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2", "lessThan": "830c1f3e71989448652973375ef5e39b6ede47a3", "versionType": "git"}, {"status": "affected", "version": "1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2", "lessThan": "c5c79d92da0f9a09f48be5e2aabed2d6d1a96294", "versionType": "git"}, {"status": "affected", "version": "1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2", "lessThan": "af7341616b742ad2c374a90998bd650a035f694d", "versionType": "git"}, {"status": "affected", "version": "1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2", "lessThan": "1b864b6cb213bbd7b406e9b2e98c962077f300df", "versionType": "git"}], "programFiles": ["drivers/crypto/ccp/sev-dev.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.9"}, {"status": "unaffected", "version": "0", "lessThan": "6.9", "versionType": "semver"}, {"status": "unaffected", "version": "6.12.97", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.40", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.5", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/crypto/ccp/sev-dev.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/830c1f3e71989448652973375ef5e39b6ede47a3"}, {"url": "https://git.kernel.org/stable/c/c5c79d92da0f9a09f48be5e2aabed2d6d1a96294"}, {"url": "https://git.kernel.org/stable/c/af7341616b742ad2c374a90998bd650a035f694d"}, {"url": "https://git.kernel.org/stable/c/1b864b6cb213bbd7b406e9b2e98c962077f300df"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ccp - 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/crypto/ccp/sev-dev.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "830c1f3e71989448652973375ef5e39b6ede47a3", "status": "affected", "version": "1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2", "versionType": "git"}, {"lessThan": "c5c79d92da0f9a09f48be5e2aabed2d6d1a96294", "status": "affected", "version": "1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2", "versionType": "git"}, {"lessThan": "af7341616b742ad2c374a90998bd650a035f694d", "status": "affected", "version": "1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2", "versionType": "git"}, {"lessThan": "1b864b6cb213bbd7b406e9b2e98c962077f300df", "status": "affected", "version": "1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/crypto/ccp/sev-dev.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.9"}, {"lessThan": "6.9", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ccp - Fix snp_filter_reserved_mem_regions() off-by-one\n\nSashiko notes:\n\n> regarding the bounds check in snp_filter_reserved_mem_regions()\n> called via walk_iomem_res_desc(): does the check\n> if ((range_list->num_elements * 16 + 8) > PAGE_SIZE)\n> allow an off-by-one heap buffer overflow?\n>\n> If range_list->num_elements is 255, 255 * 16 + 8 = 4088, which is <= 4096.\n> Writing range->base (8 bytes) fills 4088-4095, but writing range->page_count\n> (4 bytes) would write to 4096-4099, overflowing the kzalloc-allocated\n> PAGE_SIZE buffer.\n\nFix this by accounting for the entry about to be written to, in addition to\nthe entries that are already allocated."}], "id": "CVE-2026-74404", "lastModified": "2026-10-16T20:17:25.707", "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": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74404", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T18:55:44.374861Z", "version": "2.0.3"}}]}, "published": "2026-08-15T06:22:42.433", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1b864b6cb213bbd7b406e9b2e98c962077f300df"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/830c1f3e71989448652973375ef5e39b6ede47a3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/af7341616b742ad2c374a90998bd650a035f694d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c5c79d92da0f9a09f48be5e2aabed2d6d1a96294"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: crypto: ccp - Fix snp_filter_reserved_mem_regions() off-by-one", "id": "2516744", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516744"}, "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-787", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncrypto: ccp - Fix snp_filter_reserved_mem_regions() off-by-one\nSashiko notes:\n> regarding the bounds check in snp_filter_reserved_mem_regions()\n> called via walk_iomem_res_desc(): does the check\n> if ((range_list->num_elements * 16 + 8) > PAGE_SIZE)\n> allow an off-by-one heap buffer overflow?\n>\n> If range_list->num_elements is 255, 255 * 16 + 8 = 4088, which is <= 4096.\n> Writing range->base (8 bytes) fills 4088-4095, but writing range->page_count\n> (4 bytes) would write to 4096-4099, overflowing the kzalloc-allocated\n> PAGE_SIZE buffer.\nFix this by accounting for the entry about to be written to, in addition to\nthe entries that are already allocated.", "A flaw was found in the Linux kernel's crypto: ccp component. An off-by-one error in the `snp_filter_reserved_mem_regions()` function can lead to a heap buffer overflow. This vulnerability could allow an attacker to corrupt memory, potentially leading to a denial of service or arbitrary code execution."], "name": "CVE-2026-74404", "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": "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": "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"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74404\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74404\nhttps://lore.kernel.org/linux-cve-announce/2026081509-CVE-2026-74404-2b54@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2,830c1f3e71989448652973375ef5e39b6ede47a3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2,c5c79d92da0f9a09f48be5e2aabed2d6d1a96294)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2,af7341616b742ad2c374a90998bd650a035f694d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2,1b864b6cb213bbd7b406e9b2e98c962077f300df)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.9"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.9)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T14:00:08.921121+00:00", "updated": "2026-08-17T12:15:17.947342+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-119", "CWE-787"]}