CVE-2026-31691

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/ethernet/intel/igb/igb_main.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "4700471775746058c962ded6e659bf908fd76e13", "status": "affected", "version": "2c6196013f84651772388a86dfd4bb033d0c0d45", "versionType": "git"}, {"lessThan": "27f5997686ee7fb7ac01be72b2010f168a3409fc", "status": "affected", "version": "2c6196013f84651772388a86dfd4bb033d0c0d45", "versionType": "git"}, {"lessThan": "b1e067240379f950a0022208e0685f3465c211cb", "status": "affected", "version": "2c6196013f84651772388a86dfd4bb033d0c0d45", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/ethernet/intel/igb/igb_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": "6.18.23", "versionType": "semver"}, {"lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.13", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "EA76AE25-9812-47C4-9714-A85435AEFA0F", "versionEndExcluding": "6.18.23", "versionStartIncluding": "6.14", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "1490EF9B-9080-481C-8D22-1306AAE664E4", "versionEndExcluding": "6.19.13", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*", "matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nigb: remove napi_synchronize() in igb_down()\n\nWhen an AF_XDP zero-copy application terminates abruptly (e.g., kill -9),\nthe XSK buffer pool is destroyed but NAPI polling continues.\nigb_clean_rx_irq_zc() repeatedly returns the full budget, preventing\nnapi_complete_done() from clearing NAPI_STATE_SCHED.\n\nigb_down() calls napi_synchronize() before napi_disable() for each queue\nvector. napi_synchronize() spins waiting for NAPI_STATE_SCHED to clear,\nwhich never happens. igb_down() blocks indefinitely, the TX watchdog\nfires, and the TX queue remains permanently stalled.\n\nnapi_disable() already handles this correctly: it sets NAPI_STATE_DISABLE.\nAfter a full-budget poll, __napi_poll() checks napi_disable_pending(). If\nset, it forces completion and clears NAPI_STATE_SCHED, breaking the loop\nthat napi_synchronize() cannot.\n\nnapi_synchronize() was added in commit 41f149a285da (\"igb: Fix possible\npanic caused by Rx traffic arrival while interface is down\").\nnapi_disable() provides stronger guarantees: it prevents further\nscheduling and waits for any active poll to exit.\nOther Intel drivers (ixgbe, ice, i40e) use napi_disable() without a\npreceding napi_synchronize() in their down paths.\n\nRemove redundant napi_synchronize() call and reorder napi_disable()\nbefore igb_set_queue_napi() so the queue-to-NAPI mapping is only\ncleared after polling has fully stopped."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nigb: eliminar napi_synchronize() en igb_down()\n\nCuando una aplicaci\u00f3n AF_XDP de copia cero termina abruptamente (por ejemplo, kill -9), el pool de b\u00faferes XSK es destruido pero el sondeo NAPI contin\u00faa. igb_clean_rx_irq_zc() devuelve repetidamente el presupuesto completo, impidiendo que napi_complete_done() borre NAPI_STATE_SCHED.\n\nigb_down() llama a napi_synchronize() antes de napi_disable() para cada vector de cola. napi_synchronize() gira esperando que NAPI_STATE_SCHED se borre, lo cual nunca ocurre. igb_down() se bloquea indefinidamente, el watchdog TX se activa, y la cola TX permanece permanentemente estancada.\n\nnapi_disable() ya maneja esto correctamente: establece NAPI_STATE_DISABLE. Despu\u00e9s de un sondeo de presupuesto completo, __napi_poll() verifica napi_disable_pending(). Si est\u00e1 establecido, fuerza la finalizaci\u00f3n y borra NAPI_STATE_SCHED, rompiendo el bucle que napi_synchronize() no puede.\n\nnapi_synchronize() fue a\u00f1adido en el commit 41f149a285da (\u2019igb: Solucionar posible p\u00e1nico causado por la llegada de tr\u00e1fico Rx mientras la interfaz est\u00e1 inactiva\u2019). napi_disable() proporciona garant\u00edas m\u00e1s s\u00f3lidas: previene la programaci\u00f3n adicional y espera a que cualquier sondeo activo finalice. Otros controladores Intel (ixgbe, ice, i40e) usan napi_disable() sin un napi_synchronize() precedente en sus rutas de desactivaci\u00f3n.\n\nEliminar la llamada redundante a napi_synchronize() y reordenar napi_disable() antes de igb_set_queue_napi() para que el mapeo de cola a NAPI solo se borre despu\u00e9s de que el sondeo se haya detenido por completo."}], "id": "CVE-2026-31691", "lastModified": "2026-11-11T23:10:00.263", "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-2026-31691", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T15:24:22.822570Z", "version": "2.0.3"}}]}, "published": "2026-04-27T18:16:54.610", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/27f5997686ee7fb7ac01be72b2010f168a3409fc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4700471775746058c962ded6e659bf908fd76e13"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b1e067240379f950a0022208e0685f3465c211cb"}], "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: igb: remove napi_synchronize() in igb_down()", "id": "2463267", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2463267"}, "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-833", "details": ["A flaw was found in the Linux kernel's igb network driver. When an AF_XDP zero-copy application terminates abruptly, the network driver's NAPI polling mechanism can become stuck. This prevents the igb_down() function from completing, leading to the TX queue becoming permanently stalled. This can result in a Denial of Service (DoS) condition, making the network interface unresponsive."], "name": "CVE-2026-31691", "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": "2026-04-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31691\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31691\nhttps://lore.kernel.org/linux-cve-announce/2026042757-CVE-2026-31691-5c48@gregkh/T"], "threat_severity": "Moderate"}

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