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El b\u00fafer circular se anula en uart_tty_port_shutdown() bajo el bloqueo de giro. Sin embargo, el PM u otras devoluciones de llamada basadas en temporizadores a\u00fan pueden activarse despu\u00e9s de este evento sin saber que el puntero del b\u00fafer no es v\u00e1lido. Dado que el c\u00f3digo de serie es un poco inconsistente al verificar el estado del b\u00fafer (algunos se basan en las posiciones de cabecera y cola, otros en el puntero del b\u00fafer), es mejor tener ambos alineados, es decir, que el puntero del b\u00fafer sea NULL y las posiciones de cabecera y cola sean lo mismo, lo que significa que est\u00e1 vac\u00edo. Esto evitar\u00e1 llamadas asincr\u00f3nicas para desreferenciar el puntero NULL como se inform\u00f3 recientemente en el caso 8250: ERROR: desreferencia del puntero NULL del kernel, direcci\u00f3n: 00000cf5 Cola de trabajo: pm pm_runtime_work EIP: serial8250_tx_chars (drivers/tty/serial/8250/8250_port.c:1809). . serial8250_tx_chars (drivers/tty/serial/8250/8250_port.c:1809) __start_tx (drivers/tty/serial/8250/8250_port.c:1551) serial8250_start_tx (drivers/tty/serial/8250/8250_port.c:1654) serial_port_runtime_suspend ( incluir/linux/serial_core.h:667 controladores/tty/serial/serial_port.c:63) __rpm_callback (drivers/base/power/runtime.c:393)? serial_port_remove (drivers/tty/serial/serial_port.c:50) rpm_suspend (drivers/base/power/runtime.c:447) El cambio propuesto evitar\u00e1 que se llame a ->start_tx() durante la suspensi\u00f3n al cerrar el puerto."}], "id": "CVE-2024-26998", "lastModified": "2024-12-23T19:50:05.873", "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"}]}, "published": "2024-05-01T06:15:17.780", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7ae7104d54342433a3a73975f6569beefdd86350"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9cf7ea2eeb745213dc2a04103e426b960e807940"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bb1118905e875c111d7ccef9aee86ac5e4e7f985"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7ae7104d54342433a3a73975f6569beefdd86350"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9cf7ea2eeb745213dc2a04103e426b960e807940"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bb1118905e875c111d7ccef9aee86ac5e4e7f985"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: serial: core: Clearing the circular buffer before NULLifying it", "id": "2278303", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2278303"}, "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": ["In the Linux kernel, the following vulnerability has been resolved:\nserial: core: Clearing the circular buffer before NULLifying it\nThe circular buffer is NULLified in uart_tty_port_shutdown()\nunder the spin lock. However, the PM or other timer based callbacks\nmay still trigger after this event without knowning that buffer pointer\nis not valid. Since the serial code is a bit inconsistent in checking\nthe buffer state (some rely on the head-tail positions, some on the\nbuffer pointer), it's better to have both aligned, i.e. buffer pointer\nto be NULL and head-tail possitions to be the same, meaning it's empty.\nThis will prevent asynchronous calls to dereference NULL pointer as\nreported recently in 8250 case:\nBUG: kernel NULL pointer dereference, address: 00000cf5\nWorkqueue: pm pm_runtime_work\nEIP: serial8250_tx_chars (drivers/tty/serial/8250/8250_port.c:1809)\n...\n? serial8250_tx_chars (drivers/tty/serial/8250/8250_port.c:1809)\n__start_tx (drivers/tty/serial/8250/8250_port.c:1551)\nserial8250_start_tx (drivers/tty/serial/8250/8250_port.c:1654)\nserial_port_runtime_suspend (include/linux/serial_core.h:667 drivers/tty/serial/serial_port.c:63)\n__rpm_callback (drivers/base/power/runtime.c:393)\n? serial_port_remove (drivers/tty/serial/serial_port.c:50)\nrpm_suspend (drivers/base/power/runtime.c:447)\nThe proposed change will prevent ->start_tx() to be called during\nsuspend on shut down port.", "A vulnerability was found in the Linux kernel's serial core subsystem when handling circular buffers, where the buffer is not properly cleared before being set to NULL. This could lead to data leakage or unexpected behavior."], "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-2024-26998", "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": "2024-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-26998\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-26998\nhttps://lore.kernel.org/linux-cve-announce/2024050145-CVE-2024-26998-2262@gregkh/T"], "statement": "Red Hat Enterprise Linux is not vulnerable to this CVE, as it does not affect the versions or configurations of the Linux kernel used in its distributions.", "threat_severity": "Moderate"}