CVE-2021-47587

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This creates an opportunity\nfor the SYSTEMPORT hardware to work on corrupted descriptors if we have\nmultiple producers at once which is the case when using multiple transmit\nqueues.\n\nThis was particularly noticeable when using multiple flows/transmit queues and\nit showed up in interesting ways in that UDP packets would get a correct UDP\nheader checksum being calculated over an incorrect packet length. Similarly TCP\npackets would get an equally correct checksum computed by the hardware over an\nincorrect packet length.\n\nThe SYSTEMPORT hardware maintains an internal descriptor list that it re-arranges\nwhen the driver produces a new descriptor anytime it writes to the\nWRITE_PORT_{HI,LO} registers, there is however some delay in the hardware to\nre-organize its descriptors and it is possible that concurrent TX queues\neventually break this internal allocation scheme to the point where the\nlength/status part of the descriptor gets used for an incorrect data buffer.\n\nThe fix is to impose a global serialization for all TX queues in the short\nsection where we are writing to the WRITE_PORT_{HI,LO} registers which solves\nthe corruption even with multiple concurrent TX queues being used."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - Broadcom SYSTEMPORT is the CPU Ethernet MAC on BCM7xxx set-top/gateway SoCs; concurrent multi-queue TX through bcm_sysport_xmit is driven by routed/forwarded Internet flows as well as local sockets, so a remote peer can trigger the race without L2 adjacency (unlike oversize-frame RX bugs that cannot survive routing).\nAC:L - The attacker fully controls both sides of the race by opening multiple concurrent flows that hash onto different TX queues and repeatedly stressing WRITE_PORT_{HI,LO} producers; no attacker-uncontrollable hardware errata or layout precondition is required.\nPR:N - Triggering only requires causing the interface to transmit on multiple queues (e.g., unauthenticated traffic that the gateway routes or replies to); no host account, capability, or pre-auth gate sits on ndo_start_xmit.\nUI:N - Exploitation needs only attacker-driven traffic while the interface is already up; no victim action such as mounting a filesystem or opening a device is required.\nS:U - Impact stays inside the host kernel/NIC datapath (corrupted TX descriptors and host memory read for DMA); it does not cross a VM, IOMMU-bypass, or other distinct security authority boundary.\nC:H - When HW pairs one descriptor\u2019s length/status with another buffer, a larger length causes DMA reads past the mapped TX buffer and transmits adjacent host memory on the wire (and can disclose another flow\u2019s payload), which is an unbounded-enough OOB read to score High.\nI:H - The same mismatch emits packets whose L4 checksums are computed over incorrect lengths/contents, so peers accept substituted or corrupted data, and cross-queue buffer/length mixing falsifies outbound traffic integrity under attacker-driven concurrency.\nA:H - Corrupted HW descriptor state can stall or break TX (timeouts/hangs) and deny network availability on the gateway; severe descriptor confusion can also fault the DMA path, fully disrupting the host\u2019s networking."}]}], "affected": [{"product": "Linux", 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concurrent multi-queue TX through bcm_sysport_xmit is driven by routed/forwarded Internet flows as well as local sockets, so a remote peer can trigger the race without L2 adjacency (unlike oversize-frame RX bugs that cannot survive routing).\nAC:L - The attacker fully controls both sides of the race by opening multiple concurrent flows that hash onto different TX queues and repeatedly stressing WRITE_PORT_{HI,LO} producers; no attacker-uncontrollable hardware errata or layout precondition is required.\nPR:N - Triggering only requires causing the interface to transmit on multiple queues (e.g., unauthenticated traffic that the gateway routes or replies to); no host account, capability, or pre-auth gate sits on ndo_start_xmit.\nUI:N - Exploitation needs only attacker-driven traffic while the interface is already up; no victim action such as mounting a filesystem or opening a device is required.\nS:U - Impact stays inside the host kernel/NIC datapath (corrupted TX descriptors and host memory read for DMA); it does not cross a VM, IOMMU-bypass, or other distinct security authority boundary.\nC:H - When HW pairs one descriptor\u2019s length/status with another buffer, a larger length causes DMA reads past the mapped TX buffer and transmits adjacent host memory on the wire (and can disclose another flow\u2019s payload), which is an unbounded-enough OOB read to score High.\nI:H - The same mismatch emits packets whose L4 checksums are computed over incorrect lengths/contents, so peers accept substituted or corrupted data, and cross-queue buffer/length mixing falsifies outbound traffic integrity under attacker-driven concurrency.\nA:H - Corrupted HW descriptor state can stall or break TX (timeouts/hangs) and deny network availability on the gateway; severe descriptor confusion can also fault the DMA path, fully disrupting the host\u2019s networking."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "80105befdb4b8cea924711b40b2462b87df65b62", "lessThan": "8ed2f5d08d6e59f8c78b2869bfb95d0be32c094c", "versionType": "git"}, {"status": "affected", "version": "80105befdb4b8cea924711b40b2462b87df65b62", "lessThan": "de57f62f76450b934de8203711bdc4f7953c3421", "versionType": "git"}, {"status": "affected", "version": "80105befdb4b8cea924711b40b2462b87df65b62", "lessThan": "f3fde37d3f0d429f0fcce214cb52588a9e21260e", "versionType": "git"}, {"status": "affected", "version": "80105befdb4b8cea924711b40b2462b87df65b62", "lessThan": "595a684fa6f23b21958379a18cfa83862c73c2e1", "versionType": "git"}, {"status": "affected", "version": "80105befdb4b8cea924711b40b2462b87df65b62", "lessThan": "c675256a7f131f5ba3f331efb715e8f31ea0e392", "versionType": "git"}, {"status": "affected", "version": "80105befdb4b8cea924711b40b2462b87df65b62", "lessThan": "6e1011cd183faae8daff275c72444edcdfe0d473", "versionType": "git"}, {"status": "affected", "version": "80105befdb4b8cea924711b40b2462b87df65b62", "lessThan": "eb4687c7442942e115420a30185f8d83faf37696", "versionType": "git"}, {"status": "affected", "version": "80105befdb4b8cea924711b40b2462b87df65b62", "lessThan": "8b8e6e782456f1ce02a7ae914bbd5b1053f0b034", "versionType": "git"}], "programFiles": ["drivers/net/ethernet/broadcom/bcmsysport.c", "drivers/net/ethernet/broadcom/bcmsysport.h"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.16"}, {"status": "unaffected", "version": "0", "lessThan": "3.16", "versionType": "semver"}, {"status": "unaffected", "version": "4.4.296", "versionType": "semver", "lessThanOrEqual": "4.4.*"}, {"status": "unaffected", "version": "4.9.294", "versionType": "semver", "lessThanOrEqual": "4.9.*"}, {"status": "unaffected", "version": "4.14.259", "versionType": "semver", "lessThanOrEqual": "4.14.*"}, {"status": "unaffected", "version": "4.19.222", "versionType": "semver", "lessThanOrEqual": "4.19.*"}, {"status": "unaffected", "version": "5.4.168", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.88", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.11", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "5.16", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/net/ethernet/broadcom/bcmsysport.c", "drivers/net/ethernet/broadcom/bcmsysport.h"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/8ed2f5d08d6e59f8c78b2869bfb95d0be32c094c"}, {"url": "https://git.kernel.org/stable/c/de57f62f76450b934de8203711bdc4f7953c3421"}, {"url": "https://git.kernel.org/stable/c/f3fde37d3f0d429f0fcce214cb52588a9e21260e"}, {"url": "https://git.kernel.org/stable/c/595a684fa6f23b21958379a18cfa83862c73c2e1"}, {"url": "https://git.kernel.org/stable/c/c675256a7f131f5ba3f331efb715e8f31ea0e392"}, {"url": "https://git.kernel.org/stable/c/6e1011cd183faae8daff275c72444edcdfe0d473"}, {"url": "https://git.kernel.org/stable/c/eb4687c7442942e115420a30185f8d83faf37696"}, {"url": "https://git.kernel.org/stable/c/8b8e6e782456f1ce02a7ae914bbd5b1053f0b034"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: systemport: Add global locking for descriptor lifecycle\n\nThe descriptor list is a shared resource across all of the transmit queues, and\nthe locking mechanism used today only protects concurrency across a given\ntransmit queue between the transmit and reclaiming. This creates an opportunity\nfor the SYSTEMPORT hardware to work on corrupted descriptors if we have\nmultiple producers at once which is the case when using multiple transmit\nqueues.\n\nThis was particularly noticeable when using multiple flows/transmit queues and\nit showed up in interesting ways in that UDP packets would get a correct UDP\nheader checksum being calculated over an incorrect packet length. 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This creates an opportunity\nfor the SYSTEMPORT hardware to work on corrupted descriptors if we have\nmultiple producers at once which is the case when using multiple transmit\nqueues.\n\nThis was particularly noticeable when using multiple flows/transmit queues and\nit showed up in interesting ways in that UDP packets would get a correct UDP\nheader checksum being calculated over an incorrect packet length. Similarly TCP\npackets would get an equally correct checksum computed by the hardware over an\nincorrect packet length.\n\nThe SYSTEMPORT hardware maintains an internal descriptor list that it re-arranges\nwhen the driver produces a new descriptor anytime it writes to the\nWRITE_PORT_{HI,LO} registers, there is however some delay in the hardware to\nre-organize its descriptors and it is possible that concurrent TX queues\neventually break this internal allocation scheme to the point where the\nlength/status part of the descriptor gets used for an incorrect data buffer.\n\nThe fix is to impose a global serialization for all TX queues in the short\nsection where we are writing to the WRITE_PORT_{HI,LO} registers which solves\nthe corruption even with multiple concurrent TX queues being used."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net: systemport: agregue bloqueo global para el ciclo de vida del descriptor. La lista de descriptores es un recurso compartido entre todas las colas de transmisi\u00f3n y el mecanismo de bloqueo que se usa hoy solo protege la concurrencia en una cola de transmisi\u00f3n determinada. entre la transmisi\u00f3n y la recuperaci\u00f3n. Esto crea una oportunidad para que el hardware de SYSTEMPORT funcione con descriptores corruptos si tenemos varios productores a la vez, como es el caso cuando utilizamos varias colas de transmisi\u00f3n. Esto fue particularmente notable cuando se usaban m\u00faltiples flujos/colas de transmisi\u00f3n y se mostr\u00f3 de manera interesante en que los paquetes UDP obtendr\u00edan una suma de verificaci\u00f3n de encabezado UDP correcta al calcularse sobre una longitud de paquete incorrecta. De manera similar, los paquetes TCP obtendr\u00edan una suma de verificaci\u00f3n igualmente correcta calculada por el hardware en una longitud de paquete incorrecta. El hardware de SYSTEMPORT mantiene una lista de descriptores internos que reorganiza cuando el controlador produce un nuevo descriptor cada vez que escribe en los registros WRITE_PORT_{HI,LO}. Sin embargo, hay cierto retraso en el hardware para reorganizar sus descriptores y es Es posible que las colas de TX simult\u00e1neas eventualmente rompan este esquema de asignaci\u00f3n interna hasta el punto en que la parte de longitud/estado del descriptor se use para un b\u00fafer de datos incorrecto. La soluci\u00f3n es imponer una serializaci\u00f3n global para todas las colas de TX en la secci\u00f3n corta donde escribimos en los registros WRITE_PORT_{HI,LO}, lo que resuelve la corrupci\u00f3n incluso cuando se utilizan varias colas de TX simult\u00e1neas."}], "id": "CVE-2021-47587", "lastModified": "2026-08-04T10:17:09.720", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47587", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T17:12:42.935460Z", "version": "2.0.3"}}]}, "published": "2024-06-19T15:15:53.260", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/595a684fa6f23b21958379a18cfa83862c73c2e1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6e1011cd183faae8daff275c72444edcdfe0d473"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8b8e6e782456f1ce02a7ae914bbd5b1053f0b034"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8ed2f5d08d6e59f8c78b2869bfb95d0be32c094c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c675256a7f131f5ba3f331efb715e8f31ea0e392"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/de57f62f76450b934de8203711bdc4f7953c3421"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eb4687c7442942e115420a30185f8d83faf37696"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f3fde37d3f0d429f0fcce214cb52588a9e21260e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/595a684fa6f23b21958379a18cfa83862c73c2e1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6e1011cd183faae8daff275c72444edcdfe0d473"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8b8e6e782456f1ce02a7ae914bbd5b1053f0b034"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8ed2f5d08d6e59f8c78b2869bfb95d0be32c094c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c675256a7f131f5ba3f331efb715e8f31ea0e392"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/de57f62f76450b934de8203711bdc4f7953c3421"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eb4687c7442942e115420a30185f8d83faf37696"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f3fde37d3f0d429f0fcce214cb52588a9e21260e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-667"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: systemport: Add global locking for descriptor lifecycle", "id": "2293241", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2293241"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.6", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:H", "status": "draft"}, "cwe": "CWE-667", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: systemport: Add global locking for descriptor lifecycle\nThe descriptor list is a shared resource across all of the transmit queues, and\nthe locking mechanism used today only protects concurrency across a given\ntransmit queue between the transmit and reclaiming. This creates an opportunity\nfor the SYSTEMPORT hardware to work on corrupted descriptors if we have\nmultiple producers at once which is the case when using multiple transmit\nqueues.\nThis was particularly noticeable when using multiple flows/transmit queues and\nit showed up in interesting ways in that UDP packets would get a correct UDP\nheader checksum being calculated over an incorrect packet length. Similarly TCP\npackets would get an equally correct checksum computed by the hardware over an\nincorrect packet length.\nThe SYSTEMPORT hardware maintains an internal descriptor list that it re-arranges\nwhen the driver produces a new descriptor anytime it writes to the\nWRITE_PORT_{HI,LO} registers, there is however some delay in the hardware to\nre-organize its descriptors and it is possible that concurrent TX queues\neventually break this internal allocation scheme to the point where the\nlength/status part of the descriptor gets used for an incorrect data buffer.\nThe fix is to impose a global serialization for all TX queues in the short\nsection where we are writing to the WRITE_PORT_{HI,LO} registers which solves\nthe corruption even with multiple concurrent TX queues being used."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2021-47587", "package_state": [{"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": "2024-06-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47587\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47587\nhttps://lore.kernel.org/linux-cve-announce/2024061918-CVE-2021-47587-9146@gregkh/T"], "statement": "Red Hat Enterprise Linux is not impacted by this CVE, as the vulnerability in question does not affect the specific versions or configurations of the Linux kernel used in its distributions. This ensures that users of Red Hat Enterprise Linux are not exposed to the potential risks associated with this issue, and no further action or mitigation is necessary for systems running this operating system.", "threat_severity": "Moderate"}

{}