CVE-2026-74309

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74309", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.883Z", "datePublished": "2026-08-15T05:58:09.366Z", "dateUpdated": "2026-08-17T05:45:41.596Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:45:41.596Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler\n\nLook up the IRQ index in oct_hw->irqs instead of assuming\nirq - irqs[0]. This supports non-contiguous IRQ numbers and\navoids incorrect ring indexing when irqs[0] is not the base."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "baseScore": 10, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - The bug is in octep_vdpa_intr_handler, entered when the Octeon vDPA virtio-net device raises MSI-X on queue activity; remote or guest-originated network traffic to an internet-facing VM/container backed by this hardware reliably drives that interrupt path on the host.\nAC:L - Once the vDPA device is active, Linux commonly assigns non-contiguous MSI-X Linux IRQ numbers, so the irq-irqs[0] miscalculation occurs automatically; an attacker only needs to send traffic to generate interrupts without influencing timing or layout.\nPR:N - Exploitation requires no host credentials: an unauthenticated remote attacker can trigger the handler by sending packets to a virtio-net endpoint already provisioned on Marvell Octeon vDPA hardware, without CAP_NET_ADMIN, root, or vDPA management access.\nUI:N - No victim interaction is required beyond normal automated network I/O to the exposed virtio-net interface; the attacker does not need the administrator or user to mount devices, click links, or perform any manual action.\nS:C - In the primary cloud/KVM deployment, guest or remote network traffic crosses the VM/host boundary to corrupt host kernel memory in the vDPA driver interrupt handler, enabling host compromise from tenant or external network reachability rather than staying within the guest security authority.\nC:H - Incorrect ring indexing can yield negative or out-of-bounds vqs[] indices, causing kernel heap reads via ioread8 on attacker-influenced or adjacent cb_notify_addr pointers and disclosure of surrounding kernel memory contents.\nI:H - The same out-of-bounds vqs[] access performs iowrite8 acknowledgements to wrong MMIO addresses and may invoke corrupted vqs[i].cb.callback function pointers, providing memory corruption primitives suitable for control-flow hijacking in interrupt context.\nA:H - Invalid indices lead to bad MMIO accesses and calls through corrupted callback pointers in hardirq context, which can immediately oops or panic the host kernel and deny service to all tenants on the machine."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/vdpa/octeon_ep/octep_vdpa_main.c"], "versions": [{"version": "26f8ce06af6475b33b0bc60261e9f5027f9af58f", "lessThan": "3ef0cfa77a3d526591be069850d186c255e3f0cc", "status": "affected", "versionType": "git"}, {"version": "26f8ce06af6475b33b0bc60261e9f5027f9af58f", "lessThan": "c6c7eae5de798442987619434171ac886035d57c", "status": "affected", "versionType": "git"}, {"version": "26f8ce06af6475b33b0bc60261e9f5027f9af58f", "lessThan": "0d21a1d6375a05274291e32c1ab7cd57dbb69513", "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/vdpa/octeon_ep/octep_vdpa_main.c"], "versions": [{"version": "6.14", "status": "affected"}, {"version": "0", "lessThan": "6.14", "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": "6.14", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/3ef0cfa77a3d526591be069850d186c255e3f0cc"}, {"url": "https://git.kernel.org/stable/c/c6c7eae5de798442987619434171ac886035d57c"}, {"url": "https://git.kernel.org/stable/c/0d21a1d6375a05274291e32c1ab7cd57dbb69513"}], "title": "vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/vdpa/octeon_ep/octep_vdpa_main.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "3ef0cfa77a3d526591be069850d186c255e3f0cc", "status": "affected", "version": "26f8ce06af6475b33b0bc60261e9f5027f9af58f", "versionType": "git"}, {"lessThan": "c6c7eae5de798442987619434171ac886035d57c", "status": "affected", "version": "26f8ce06af6475b33b0bc60261e9f5027f9af58f", "versionType": "git"}, {"lessThan": "0d21a1d6375a05274291e32c1ab7cd57dbb69513", "status": "affected", "version": "26f8ce06af6475b33b0bc60261e9f5027f9af58f", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/vdpa/octeon_ep/octep_vdpa_main.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.14"}, {"lessThan": "6.14", "status": "unaffected", "version": "0", "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\nvdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler\n\nLook up the IRQ index in oct_hw->irqs instead of assuming\nirq - irqs[0]. This supports non-contiguous IRQ numbers and\navoids incorrect ring indexing when irqs[0] is not the base."}], "id": "CVE-2026-74309", "lastModified": "2026-08-17T06:19:25.090", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 10.0, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 6.0, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-15T06:22:30.823", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0d21a1d6375a05274291e32c1ab7cd57dbb69513"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3ef0cfa77a3d526591be069850d186c255e3f0cc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c6c7eae5de798442987619434171ac886035d57c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler", "id": "2516794", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516794"}, "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-131", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nvdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler\nLook up the IRQ index in oct_hw->irqs instead of assuming\nirq - irqs[0]. This supports non-contiguous IRQ numbers and\navoids incorrect ring indexing when irqs[0] is not the base.", "A flaw was found in the Linux kernel's `vdpa/octeon_ep` component. This vulnerability involves an incorrect mapping of Interrupt Request (IRQ) numbers to processing rings within the interrupt handler. The system incorrectly calculates the IRQ index, which can lead to misdirected or mishandled interrupts. This issue could potentially cause system instability or unexpected operational behavior."], "name": "CVE-2026-74309", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not 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": "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "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-2026-74309\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74309\nhttps://lore.kernel.org/linux-cve-announce/2026081551-CVE-2026-74309-ec50@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[26f8ce06af6475b33b0bc60261e9f5027f9af58f,3ef0cfa77a3d526591be069850d186c255e3f0cc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[26f8ce06af6475b33b0bc60261e9f5027f9af58f,c6c7eae5de798442987619434171ac886035d57c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[26f8ce06af6475b33b0bc60261e9f5027f9af58f,0d21a1d6375a05274291e32c1ab7cd57dbb69513)"}}], "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": "6.14"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.14)"}}, {"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": "2026-08-15T12:30:07.841969+00:00", "updated": "2026-08-22T02:45:03.716457+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}