{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72409", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.926Z", "datePublished": "2026-08-15T05:56:32.152Z", "dateUpdated": "2026-08-17T05:43:49.648Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:43:49.648Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mvneta: re-enable percpu interrupt on resume\n\nOn Marvell MPIC platforms (Armada 370/XP/38x), mvneta uses a percpu\nIRQ disable/enable scheme for NAPI: the ISR (mvneta_percpu_isr) calls\ndisable_percpu_irq() to mask the MPIC per-CPU interrupt and schedules\nNAPI poll, which calls enable_percpu_irq() on completion to unmask.\n\nIf suspend occurs while NAPI poll is pending (between\ndisable_percpu_irq in the ISR and enable_percpu_irq in poll\ncompletion), the interrupt is never re-enabled:\n\n 1. mvneta_percpu_isr: disable_percpu_irq() + napi_schedule()\n => MPIC masked, percpu_enabled cpumask bit cleared\n 2. NAPI poll does not complete before suspend proceeds\n (on PREEMPT_RT this is highly likely since softirqs run in\n ksoftirqd which gets frozen; on non-RT it can happen when\n softirq processing is deferred to ksoftirqd)\n 3. mvneta_stop_dev => napi_disable(): cancels the pending poll\n without executing the completion path\n 4. suspend_device_irqs => IRQCHIP_MASK_ON_SUSPEND: masks MPIC\n (already masked, but records IRQS_SUSPENDED)\n 5. Resume: mpic_resume checks irq_percpu_is_enabled() => false\n (bit was cleared in step 1) => skips unmask\n 6. mvneta_start_dev only restores device-level INTR_NEW_MASK,\n does not touch the MPIC per-CPU mask\n\nResult: MPIC per-CPU interrupt stays masked permanently. The NIC\ngenerates interrupts (INTR_NEW_CAUSE != 0) but the CPU never\nreceives them, causing complete loss of network connectivity.\n\nFix by calling on_each_cpu(mvneta_percpu_enable) in the resume path\nto unconditionally unmask the MPIC per-CPU interrupt regardless of\npre-suspend state." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - Remote traffic on internet-facing Marvell Armada 370/XP/38x routers, NAS, and gateways drives mvneta_percpu_isr/NAPI (race step 1); the highest-impact scenario pairs sustained RX/TX load with automatic suspend/resume, so the attack is initiated from the network.\nAC:L - On PREEMPT_RT (called highly likely in the fix) or when softirq is deferred to ksoftirqd, an attacker can sustain traffic to keep NAPI pending across suspend; no uncontrollable memory layout or rare one-shot victim state is required beyond routine PM cycles.\nPR:N - Sending packets to the mvneta interface requires no credentials; in the strongest scenario suspend/resume is driven by automatic system power management rather than privileged manual action, so no account or capability on the victim is needed.\nUI:N - No victim user action is required beyond normal operation; remote traffic and automatic suspend/resume (or scheduled PM) suffice without anyone mounting devices or confirming prompts.\nS:U - The bug leaves the MPIC per-CPU IRQ permanently masked on the same host kernel/driver boundary; it does not cross VM, container, or IOMMU security domains.\nC:N - This is a driver/IRQ state-management logic error with no out-of-bounds access, use-after-free, or memory disclosure; interrupts stay masked but no kernel memory is read.\nI:N - No data structures or packets are corrupted; the failure mode is a permanently masked interrupt with no write primitive or control-flow hijack potential.\nA:H - After resume the MPIC per-CPU interrupt remains permanently masked, so the NIC never delivers packets despite hardware activity, causing complete and lasting loss of network connectivity until reboot." } ] } ], "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/mvneta.c" ], "versions": [ { "version": "12bb03b436dad56692e9a103ed26156156bef5d2", "lessThan": "bf88cd3b649bc3e638f1e8a77649581852747a68", "status": "affected", "versionType": "git" }, { "version": "12bb03b436dad56692e9a103ed26156156bef5d2", "lessThan": "8c7a489aa71d2693752b2e794a68bf672d16c829", "status": "affected", "versionType": "git" }, { "version": "12bb03b436dad56692e9a103ed26156156bef5d2", "lessThan": "82c13027ed283b856017adee970dbfdffce5c6b8", "status": "affected", "versionType": "git" }, { "version": "12bb03b436dad56692e9a103ed26156156bef5d2", "lessThan": "be626ac1faadd49c2cead9f9cd06ba8752d81563", "status": "affected", "versionType": "git" }, { "version": "12bb03b436dad56692e9a103ed26156156bef5d2", "lessThan": "1cc312dc8bc78fa24c80d5bc193dbf5b57a99cc6", "status": "affected", "versionType": "git" }, { "version": "12bb03b436dad56692e9a103ed26156156bef5d2", "lessThan": "b84dd48f9da1eb132bdc06a944423cd5a1641ef1", "status": "affected", "versionType": "git" }, { "version": "12bb03b436dad56692e9a103ed26156156bef5d2", "lessThan": "5bdb33ff6e58bdc43632e98b30723eb65352d671", "status": "affected", "versionType": "git" }, { "version": "12bb03b436dad56692e9a103ed26156156bef5d2", "lessThan": "fd398d6480987e4c84fff0aaab6b9d6642a93343", "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/net/ethernet/marvell/mvneta.c" ], "versions": [ { "version": "4.4", "status": "affected" }, { "version": "0", "lessThan": "4.4", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "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": "4.4", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/bf88cd3b649bc3e638f1e8a77649581852747a68" }, { "url": "https://git.kernel.org/stable/c/8c7a489aa71d2693752b2e794a68bf672d16c829" }, { "url": "https://git.kernel.org/stable/c/82c13027ed283b856017adee970dbfdffce5c6b8" }, { "url": "https://git.kernel.org/stable/c/be626ac1faadd49c2cead9f9cd06ba8752d81563" }, { "url": "https://git.kernel.org/stable/c/1cc312dc8bc78fa24c80d5bc193dbf5b57a99cc6" }, { "url": "https://git.kernel.org/stable/c/b84dd48f9da1eb132bdc06a944423cd5a1641ef1" }, { "url": "https://git.kernel.org/stable/c/5bdb33ff6e58bdc43632e98b30723eb65352d671" }, { "url": "https://git.kernel.org/stable/c/fd398d6480987e4c84fff0aaab6b9d6642a93343" } ], "title": "net: mvneta: re-enable percpu interrupt on resume", 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