CVE-2025-39724

{"id": "CVE-2025-39724", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-39724", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-05T21:08:49.241627Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "c49436b657d0a56a6ad90d14a7c3041add7cf64d", "lessThan": "0b882f00655afefbc7729c6b5aec86f7a5473a3d", "versionType": "git"}, {"status": "affected", "version": "c49436b657d0a56a6ad90d14a7c3041add7cf64d", "lessThan": "b8ca8e3f75ede308b4d49a6ca5081460be01bdb5", "versionType": "git"}, {"status": "affected", "version": "c49436b657d0a56a6ad90d14a7c3041add7cf64d", "lessThan": "68c4613e89f000e8198f9ace643082c697921c9f", "versionType": "git"}, {"status": "affected", "version": "c49436b657d0a56a6ad90d14a7c3041add7cf64d", "lessThan": "c826943abf473a3f7260fbadfad65e44db475460", "versionType": "git"}, {"status": "affected", "version": "c49436b657d0a56a6ad90d14a7c3041add7cf64d", "lessThan": "cb7b3633ed749db8e56f475f43c960652cbd6882", "versionType": "git"}, {"status": "affected", "version": "c49436b657d0a56a6ad90d14a7c3041add7cf64d", "lessThan": "8e2739478c164147d0774802008528d9e03fb802", "versionType": "git"}, {"status": "affected", "version": "c49436b657d0a56a6ad90d14a7c3041add7cf64d", "lessThan": "38c0ea484dedb58cb3a4391229933e16be0d1031", "versionType": "git"}, {"status": "affected", "version": "c49436b657d0a56a6ad90d14a7c3041add7cf64d", "lessThan": "7f8fdd4dbffc05982b96caf586f77a014b2a9353", "versionType": "git"}, {"status": "affected", "version": "6d5e79331417886196cb3a733bdb6645ba85bc42", "versionType": "git"}, {"status": "affected", "version": "2401577586898b3590db80f8b97a26f81f0f6d4e", "versionType": "git"}, {"status": "affected", "version": "3.10.48", "lessThan": "3.11", "versionType": "semver"}, {"status": "affected", "version": "3.12.24", "lessThan": "3.13", "versionType": "semver"}], "programFiles": ["drivers/tty/serial/8250/8250_port.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.13"}, {"status": "unaffected", "version": "0", "lessThan": "3.13", "versionType": "semver"}, {"status": "unaffected", "version": "5.4.297", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.241", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.190", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.149", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.103", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.44", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.16.4", "versionType": "semver", "lessThanOrEqual": "6.16.*"}, {"status": "unaffected", "version": "6.17", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/tty/serial/8250/8250_port.c"], "defaultStatus": "affected"}]}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "affectedData": [{"vendor": "Siemens", "product": "SIMATIC CN 4100", "versions": [{"status": "affected", "version": "0", "lessThan": "V5.0", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [{"status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [{"status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [{"status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [{"status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP", "versions": [{"status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}]}], "published": "2025-09-05T18:15:50.177", "references": [{"url": "https://git.kernel.org/stable/c/0b882f00655afefbc7729c6b5aec86f7a5473a3d", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/38c0ea484dedb58cb3a4391229933e16be0d1031", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/68c4613e89f000e8198f9ace643082c697921c9f", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/7f8fdd4dbffc05982b96caf586f77a014b2a9353", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/8e2739478c164147d0774802008528d9e03fb802", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/b8ca8e3f75ede308b4d49a6ca5081460be01bdb5", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c826943abf473a3f7260fbadfad65e44db475460", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/cb7b3633ed749db8e56f475f43c960652cbd6882", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html", "tags": ["Mailing List", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html", "tags": ["Mailing List", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html", "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}, {"url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html", "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nserial: 8250: fix panic due to PSLVERR\n\nWhen the PSLVERR_RESP_EN parameter is set to 1, the device generates\nan error response if an attempt is made to read an empty RBR (Receive\nBuffer Register) while the FIFO is enabled.\n\nIn serial8250_do_startup(), calling serial_port_out(port, UART_LCR,\nUART_LCR_WLEN8) triggers dw8250_check_lcr(), which invokes\ndw8250_force_idle() and serial8250_clear_and_reinit_fifos(). The latter\nfunction enables the FIFO via serial_out(p, UART_FCR, p->fcr).\nExecution proceeds to the serial_port_in(port, UART_RX).\nThis satisfies the PSLVERR trigger condition.\n\nWhen another CPU (e.g., using printk()) is accessing the UART (UART\nis busy), the current CPU fails the check (value & ~UART_LCR_SPAR) ==\n(lcr & ~UART_LCR_SPAR) in dw8250_check_lcr(), causing it to enter\ndw8250_force_idle().\n\nPut serial_port_out(port, UART_LCR, UART_LCR_WLEN8) under the port->lock\nto fix this issue.\n\nPanic backtrace:\n[ 0.442336] Oops - unknown exception [#1]\n[ 0.442343] epc : dw8250_serial_in32+0x1e/0x4a\n[ 0.442351] ra : serial8250_do_startup+0x2c8/0x88e\n...\n[ 0.442416] console_on_rootfs+0x26/0x70"}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nserial: 8250: correcci\u00f3n de p\u00e1nico debido a PSLVERR\n\nCuando el par\u00e1metro PSLVERR_RESP_EN se establece en 1, el dispositivo genera una respuesta de error si se intenta leer un RBR (Receive Buffer Register) vac\u00edo mientras el FIFO est\u00e1 habilitado.\n\nEn serial8250_do_startup(), la llamada a serial_port_out(port, UART_LCR, UART_LCR_WLEN8) activa dw8250_check_lcr(), que invoca dw8250_force_idle() y serial8250_clear_and_reinit_fifos(). Esta \u00faltima funci\u00f3n habilita el FIFO a trav\u00e9s de serial_out(p, UART_FCR, p->fcr). La ejecuci\u00f3n contin\u00faa hasta el serial_port_in(port, UART_RX). Esto satisface la condici\u00f3n de activaci\u00f3n de PSLVERR.\n\nCuando otra CPU (por ejemplo, usando printk()) est\u00e1 accediendo a la UART (la UART est\u00e1 ocupada), la CPU actual falla la verificaci\u00f3n (value & ~UART_LCR_SPAR) == (lcr & ~UART_LCR_SPAR) en dw8250_check_lcr(), lo que hace que entre en dw8250_force_idle().\n\nColocar serial_port_out(port, UART_LCR, UART_LCR_WLEN8) bajo el port->lock para solucionar este problema.\n\nRastreo de p\u00e1nico:\n[ 0.442336] Oops - excepci\u00f3n desconocida [#1]\n[ 0.442343] epc : dw8250_serial_in32+0x1e/0x4a\n[ 0.442351] ra : serial8250_do_startup+0x2c8/0x88e\n...\n[ 0.442416] console_on_rootfs+0x26/0x70"}], "lastModified": "2026-11-05T22:17:28.687", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AEFBF6E4-EDFE-4B47-83FA-927218F54577", "versionEndExcluding": "3.11", "versionStartIncluding": "3.10.48"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "075FE4E0-B619-42CF-9277-44F7A260215B", "versionEndExcluding": "5.4.297", "versionStartIncluding": "3.12.24"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D0D21C35-EB8A-488A-BBF9-403E4817E5DD", "versionEndExcluding": "5.10.241", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AD9E597F-3DDE-4D7E-976C-463D0611F13F", "versionEndExcluding": "5.15.190", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FDBE8280-8983-4D2D-943D-2E6D0104E2D8", "versionEndExcluding": "6.1.149", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F2293654-7169-49B5-8D0D-EE51EF8B8E48", "versionEndExcluding": "6.6.103", "versionStartIncluding": "6.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "12351F24-1133-4775-960C-F2B47E81298B", "versionEndExcluding": "6.12.44", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AFC28995-B8C3-4B68-8CB6-78E792B6629D", "versionEndExcluding": "6.16.4", "versionStartIncluding": "6.13"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}