CVE-2025-38312
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: fbdev: core: fbcvt: avoid division by 0 in fb_cvt_hperiod() In fb_find_mode_cvt(), iff mode->refresh somehow happens to be 0x80000000, cvt.f_refresh will become 0 when multiplying it by 2 due to overflow. It's then passed to fb_cvt_hperiod(), where it's used as a divider -- division by 0 will result in kernel oops. Add a sanity check for cvt.f_refresh to avoid such overflow... Found by Linux Verification Center (linuxtesting.org) with the Svace static analysis tool.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-07-10 08:15:30.120000
Last modified
2026-11-05 21:18:26.147000
View original CVE JSON
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"id": "CVE-2025-38312",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-07-10T08:15:30.120",
"lastModified": "2026-11-05T21:18:26.147",
"vulnStatus": "Modified",
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: core: fbcvt: avoid division by 0 in fb_cvt_hperiod()\n\nIn fb_find_mode_cvt(), iff mode->refresh somehow happens to be 0x80000000,\ncvt.f_refresh will become 0 when multiplying it by 2 due to overflow. It's\nthen passed to fb_cvt_hperiod(), where it's used as a divider -- division\nby 0 will result in kernel oops. Add a sanity check for cvt.f_refresh to\navoid such overflow...\n\nFound by Linux Verification Center (linuxtesting.org) with the Svace static\nanalysis tool."
},
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fbdev: core: fbcvt: evitar la división por 0 en fb_cvt_hperiod(). En fb_find_mode_cvt(), si mode->refresh resulta ser 0x80000000, cvt.f_refresh se convertirá en 0 al multiplicarlo por 2 debido a un desbordamiento. Luego se pasa a fb_cvt_hperiod(), donde se usa como divisor; la división por 0 provocará un error en el kernel. Añada una comprobación de seguridad para cvt.f_refresh para evitar dicho desbordamiento. Encontrado por el Centro de Verificación de Linux (linuxtesting.org) con la herramienta de análisis estático Svace."
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