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CVE-2025-37816 (GCVE-0-2025-37816)

Vulnerability from cvelistv5 – Published: 2025-05-08 06:26 – Updated: 2026-05-11 21:15
VLAI
Title
mei: vsc: Fix fortify-panic caused by invalid counted_by() use
Summary
In the Linux kernel, the following vulnerability has been resolved: mei: vsc: Fix fortify-panic caused by invalid counted_by() use gcc 15 honors the __counted_by(len) attribute on vsc_tp_packet.buf[] and the vsc-tp.c code is using this in a wrong way. len does not contain the available size in the buffer, it contains the actual packet length *without* the crc. So as soon as vsc_tp_xfer() tries to add the crc to buf[] the fortify-panic handler gets triggered: [ 80.842193] memcpy: detected buffer overflow: 4 byte write of buffer size 0 [ 80.842243] WARNING: CPU: 4 PID: 272 at lib/string_helpers.c:1032 __fortify_report+0x45/0x50 ... [ 80.843175] __fortify_panic+0x9/0xb [ 80.843186] vsc_tp_xfer.cold+0x67/0x67 [mei_vsc_hw] [ 80.843210] ? seqcount_lockdep_reader_access.constprop.0+0x82/0x90 [ 80.843229] ? lockdep_hardirqs_on+0x7c/0x110 [ 80.843250] mei_vsc_hw_start+0x98/0x120 [mei_vsc] [ 80.843270] mei_reset+0x11d/0x420 [mei] The easiest fix would be to just drop the counted-by but with the exception of the ack buffer in vsc_tp_xfer_helper() which only contains enough room for the packet-header, all other uses of vsc_tp_packet always use a buffer of VSC_TP_MAX_XFER_SIZE bytes for the packet. Instead of just dropping the counted-by, split the vsc_tp_packet struct definition into a header and a full-packet definition and use a fixed size buf[] in the packet definition, this way fortify-source buffer overrun checking still works when enabled.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 566f5ca9768075e453b7b51a397733968df4287d , < 3e243378f27cc7d11682a3ad720228b0723affa5 (git)
Affected: 566f5ca9768075e453b7b51a397733968df4287d , < ac04663c67f244810b3492e9ecd9f7cdbefeca2d (git)
Affected: 566f5ca9768075e453b7b51a397733968df4287d , < 00f1cc14da0f06d2897b8c528df7c7dcf1b8da50 (git)
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Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 6.12.26 , ≤ 6.12.* (semver)
Unaffected: 6.14.5 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mei: vsc: Se corrige el problema de fortify-panic causado por el uso no v\u00e1lido de counted_by() gcc 15 respeta el atributo __counted_by(len) en vsc_tp_packet.buf[] y el c\u00f3digo vsc-tp.c lo usa de manera incorrecta. len no contiene el tama\u00f1o disponible en el b\u00fafer, contiene la longitud real del paquete *sin* el crc. Entonces, tan pronto como vsc_tp_xfer() intenta agregar el crc a buf[], se activa el controlador fortify-panic: [80.842193] memcpy: desbordamiento de b\u00fafer detectado: escritura de 4 bytes de tama\u00f1o de b\u00fafer 0 [80.842243] ADVERTENCIA: CPU: 4 PID: 272 en lib/string_helpers.c:1032 __fortify_report+0x45/0x50 ... [80.843175] __fortify_panic+0x9/0xb [80.843186] vsc_tp_xfer.cold+0x67/0x67 [mei_vsc_hw] [80.843210] ? lockdep_hardirqs_on+0x7c/0x110 [ 80.843250] mei_vsc_hw_start+0x98/0x120 [mei_vsc] [ 80.843270] mei_reset+0x11d/0x420 [mei] La soluci\u00f3n m\u00e1s f\u00e1cil ser\u00eda simplemente omitir el conteo, pero con la excepci\u00f3n del b\u00fafer de reconocimiento en vsc_tp_xfer_helper() que solo contiene suficiente espacio para el encabezado del paquete, todos los dem\u00e1s usos de vsc_tp_packet siempre usan un b\u00fafer de VSC_TP_MAX_XFER_SIZE bytes para el paquete. En lugar de simplemente eliminar el conteo, divida la definici\u00f3n de la estructura vsc_tp_packet en un encabezado y una definici\u00f3n de paquete completo y use un buf[] de tama\u00f1o fijo en la definici\u00f3n del paquete, de esta manera la verificaci\u00f3n de desbordamiento del b\u00fafer de fortify-source a\u00fan funciona cuando est\u00e1 habilitada."
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        "id": "CVE-2025-37816",
        "lastModified": "2026-06-17T09:15:29.853",
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      "cve": "CVE-2025-37816",
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      "title": "kernel: mei: vsc: Fix fortify-panic caused by invalid counted_by() use",
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      "cve": "CVE-2025-37816",
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      "source": "SUSE CSAF VEX",
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      "title": "SUSE CVE CVE-2025-37816",
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}



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