CVE-2025-39784

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/pci/pci.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "16557320f378262b5c605b15edebd3642406992a", "status": "affected", "version": "de9a6c8d5dbfedb5eb3722c822da0490f6a59a45", "versionType": "git"}, {"lessThan": "9989e0ca7462c62f93dbc62f684448aa2efb9226", "status": "affected", "version": "de9a6c8d5dbfedb5eb3722c822da0490f6a59a45", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/pci/pci.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.13"}, {"lessThan": "6.13", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.16.*", "status": "unaffected", "version": "6.16.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.17", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "AFC28995-B8C3-4B68-8CB6-78E792B6629D", "versionEndExcluding": "6.16.4", "versionStartIncluding": "6.13", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: Fix link speed calculation on retrain failure\n\nWhen pcie_failed_link_retrain() fails to retrain, it tries to revert to the\nprevious link speed. However it calculates that speed from the Link\nControl 2 register without masking out non-speed bits first.\n\nPCIE_LNKCTL2_TLS2SPEED() converts such incorrect values to\nPCI_SPEED_UNKNOWN (0xff), which in turn causes a WARN splat in\npcie_set_target_speed():\n\n pci 0000:00:01.1: [1022:14ed] type 01 class 0x060400 PCIe Root Port\n pci 0000:00:01.1: broken device, retraining non-functional downstream link at 2.5GT/s\n pci 0000:00:01.1: retraining failed\n WARNING: CPU: 1 PID: 1 at drivers/pci/pcie/bwctrl.c:168 pcie_set_target_speed\n RDX: 0000000000000001 RSI: 00000000000000ff RDI: ffff9acd82efa000\n pcie_failed_link_retrain\n pci_device_add\n pci_scan_single_device\n\nMask out the non-speed bits in PCIE_LNKCTL2_TLS2SPEED() and\nPCIE_LNKCAP_SLS2SPEED() so they don't incorrectly return PCI_SPEED_UNKNOWN.\n\n[bhelgaas: commit log, add details from https://lore.kernel.org/r/1c92ef6bcb314ee6977839b46b393282e4f52e74.1750684771.git.lukas@wunner.de]"}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nPCI: Correcci\u00f3n del c\u00e1lculo de la velocidad del enlace en caso de fallo de reentrenamiento\n\nCuando pcie_failed_link_retrain() falla al reentrenar, intenta revertir a la velocidad de enlace anterior. Sin embargo, calcula esa velocidad desde el registro Link Control 2 sin enmascarar primero los bits que no son de velocidad.\n\nPCIE_LNKCTL2_TLS2SPEED() convierte dichos valores incorrectos a PCI_SPEED_UNKNOWN (0xff), lo que a su vez provoca un WARN splat en pcie_set_target_speed():\n\n pci 0000:00:01.1: [1022:14ed] tipo 01 clase 0x060400 Puerto ra\u00edz PCIe\n pci 0000:00:01.1: dispositivo roto, reentrenando enlace descendente no funcional a 2.5GT/s\n pci 0000:00:01.1: reentrenamiento fallido\n WARNING: CPU: 1 PID: 1 en drivers/pci/pcie/bwctrl.c:168 pcie_set_target_speed\n RDX: 0000000000000001 RSI: 00000000000000ff RDI: ffff9acd82efa000\n pcie_failed_link_retrain\n pci_device_add\n pci_scan_single_device\n\nEnmascarar los bits que no son de velocidad en PCIE_LNKCTL2_TLS2SPEED() y PCIE_LNKCAP_SLS2SPEED() para que no devuelvan incorrectamente PCI_SPEED_UNKNOWN.\n\n[bhelgaas: registro de commit, a\u00f1adir detalles de https://lore.kernel.org/r/1c92ef6bcb314ee6977839b46b393282e4f52e74.1750684771.git.lukas@wunner.de]"}], "id": "CVE-2025-39784", "lastModified": "2026-11-05T22:17:31.470", "metrics": {"cvssMetricV31": [{"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-2025-39784", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T21:11:28.690357Z", "version": "2.0.3"}}]}, "published": "2025-09-11T17:15:44.493", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/16557320f378262b5c605b15edebd3642406992a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9989e0ca7462c62f93dbc62f684448aa2efb9226"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: PCI: Fix link speed calculation on retrain failure", "id": "2394607", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2394607"}, "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"}, "details": ["No description is available for this CVE."], "name": "CVE-2025-39784", "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": "Out of support scope", "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": "2025-09-11T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-39784\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-39784\nhttps://lore.kernel.org/linux-cve-announce/2025091150-CVE-2025-39784-7851@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-09-12T08:02:40.539317+00:00", "updated": "2025-09-12T08:02:40.539371+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}