{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-38448", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:24.018Z", "datePublished": "2025-07-25T15:27:30.040Z", "dateUpdated": "2026-05-11T21:28:12.055Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:28:12.055Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: u_serial: Fix race condition in TTY wakeup\n\nA race condition occurs when gs_start_io() calls either gs_start_rx() or\ngs_start_tx(), as those functions briefly drop the port_lock for\nusb_ep_queue(). This allows gs_close() and gserial_disconnect() to clear\nport.tty and port_usb, respectively.\n\nUse the null-safe TTY Port helper function to wake up TTY.\n\nExample\n CPU1:\t\t\t CPU2:\n gserial_connect() // lock\n \t\t\t gs_close() // await lock\n gs_start_rx() // unlock\n usb_ep_queue()\n \t\t\t gs_close() // lock, reset port.tty and unlock\n gs_start_rx() // lock\n tty_wakeup() // NPE"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/usb/gadget/function/u_serial.c"], "versions": [{"version": "35f95fd7f234d2b58803bab6f6ebd6bb988050a2", "lessThan": "18d58a467ccf011078352d91b4d6a0108c7318e8", "status": "affected", "versionType": "git"}, {"version": "35f95fd7f234d2b58803bab6f6ebd6bb988050a2", "lessThan": "d43657b59f36e88289a6066f15bc9a80df5014eb", "status": "affected", "versionType": "git"}, {"version": "35f95fd7f234d2b58803bab6f6ebd6bb988050a2", 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"https://git.kernel.org/stable/c/c529c3730bd09115684644e26bf01ecbd7e2c2c9"}], "title": "usb: gadget: u_serial: Fix race condition in TTY wakeup", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:38:09.442Z"}}]}}

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This allows gs_close() and gserial_disconnect() to clear\nport.tty and port_usb, respectively.\n\nUse the null-safe TTY Port helper function to wake up TTY.\n\nExample\n CPU1:\t\t\t CPU2:\n gserial_connect() // lock\n \t\t\t gs_close() // await lock\n gs_start_rx() // unlock\n usb_ep_queue()\n \t\t\t gs_close() // lock, reset port.tty and unlock\n gs_start_rx() // lock\n tty_wakeup() // NPE"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: usb: gadget: u_serial: Correcci\u00f3n de la condici\u00f3n de ejecuci\u00f3n en la activaci\u00f3n de TTY. Una condici\u00f3n de ejecuci\u00f3n ocurre cuando gs_start_io() llama a gs_start_rx() o gs_start_tx(), ya que estas funciones desactivan brevemente el port_lock para usb_ep_queue(). Esto permite que gs_close() y gserial_disconnect() borren port.tty y port_usb, respectivamente. Utilice la funci\u00f3n auxiliar de puerto TTY segura para nulos para activar TTY. Ejemplo CPU1: CPU2: gserial_connect() // bloquear gs_close() // esperar bloqueo gs_start_rx() // desbloquear usb_ep_queue() gs_close() // bloquear, restablecer port.tty y desbloquear gs_start_rx() // bloquear tty_wakeup() // NPE"}], "id": "CVE-2025-38448", "lastModified": "2025-12-22T21:53:51.967", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-07-25T16:15:30.317", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/18d58a467ccf011078352d91b4d6a0108c7318e8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a5012673d49788f16bb4e375b002d7743eb642d9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/abf3620cba68e0e51e5c21054ce4f925f75b3661"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c529c3730bd09115684644e26bf01ecbd7e2c2c9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c6eb4a05af3d0ba3bc4e8159287722fb9abc6359"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c8c80a3a35c2e3488409de2d5376ef7e662a2bf5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d43657b59f36e88289a6066f15bc9a80df5014eb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ee8d688e2ba558f3bb8ac225113740be5f335417"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: usb: gadget: u_serial: Fix race condition in TTY wakeup", "id": "2383491", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2383491"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.2", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nusb: gadget: u_serial: Fix race condition in TTY wakeup\nA race condition occurs when gs_start_io() calls either gs_start_rx() or\ngs_start_tx(), as those functions briefly drop the port_lock for\nusb_ep_queue(). This allows gs_close() and gserial_disconnect() to clear\nport.tty and port_usb, respectively.\nUse the null-safe TTY Port helper function to wake up TTY.\nExample\nCPU1: CPU2:\ngserial_connect() // lock\ngs_close() // await lock\ngs_start_rx() // unlock\nusb_ep_queue()\ngs_close() // lock, reset port.tty and unlock\ngs_start_rx() // lock\ntty_wakeup() // NPE"], "name": "CVE-2025-38448", "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": "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": "2025-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38448\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38448\nhttps://lore.kernel.org/linux-cve-announce/2025072504-CVE-2025-38448-f242@gregkh/T"], "statement": "This patch fixes a race condition in the u_serial USB gadget driver, where a NULL pointer dereference could occur if the TTY port is closed or disconnected while gs_start_io() is still in progress.\nThe bug results from a temporary unlock of port_lock, allowing another thread to reset port->tty before tty_wakeup() is called.\nThe patch replaces the direct TTY access with a null-safe helper, tty_port_tty_wakeup().\nAlthough the race is timing-sensitive, it is user-triggerable and may lead to a kernel crash, making it a potential local denial-of-service issue.\nRelated u_serial Kernel module disabled for all versions of Red Hat Enterprise Linux, and as result not affected.", "threat_severity": "Moderate"}

{"created": "2025-07-26T11:22:03.774804+00:00", "updated": "2025-07-26T11:22:03.774888+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}