CVE-2025-37816 (GCVE-0-2025-37816)
Vulnerability from cvelistv5
Published
2025-05-08 06:26
Modified
2025-05-26 05:21
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 566f5ca9768075e453b7b51a397733968df4287d
Version: 566f5ca9768075e453b7b51a397733968df4287d
Version: 566f5ca9768075e453b7b51a397733968df4287d
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/misc/mei/vsc-tp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3e243378f27cc7d11682a3ad720228b0723affa5",
              "status": "affected",
              "version": "566f5ca9768075e453b7b51a397733968df4287d",
              "versionType": "git"
            },
            {
              "lessThan": "ac04663c67f244810b3492e9ecd9f7cdbefeca2d",
              "status": "affected",
              "version": "566f5ca9768075e453b7b51a397733968df4287d",
              "versionType": "git"
            },
            {
              "lessThan": "00f1cc14da0f06d2897b8c528df7c7dcf1b8da50",
              "status": "affected",
              "version": "566f5ca9768075e453b7b51a397733968df4287d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/misc/mei/vsc-tp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.26",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.14.*",
              "status": "unaffected",
              "version": "6.14.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.26",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14.5",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmei: vsc: Fix fortify-panic caused by invalid counted_by() use\n\ngcc 15 honors the __counted_by(len) attribute on vsc_tp_packet.buf[]\nand the vsc-tp.c code is using this in a wrong way. len does not contain\nthe available size in the buffer, it contains the actual packet length\n*without* the crc. So as soon as vsc_tp_xfer() tries to add the crc to\nbuf[] the fortify-panic handler gets triggered:\n\n[   80.842193] memcpy: detected buffer overflow: 4 byte write of buffer size 0\n[   80.842243] WARNING: CPU: 4 PID: 272 at lib/string_helpers.c:1032 __fortify_report+0x45/0x50\n...\n[   80.843175]  __fortify_panic+0x9/0xb\n[   80.843186]  vsc_tp_xfer.cold+0x67/0x67 [mei_vsc_hw]\n[   80.843210]  ? seqcount_lockdep_reader_access.constprop.0+0x82/0x90\n[   80.843229]  ? lockdep_hardirqs_on+0x7c/0x110\n[   80.843250]  mei_vsc_hw_start+0x98/0x120 [mei_vsc]\n[   80.843270]  mei_reset+0x11d/0x420 [mei]\n\nThe easiest fix would be to just drop the counted-by but with the exception\nof the ack buffer in vsc_tp_xfer_helper() which only contains enough room\nfor the packet-header, all other uses of vsc_tp_packet always use a buffer\nof VSC_TP_MAX_XFER_SIZE bytes for the packet.\n\nInstead of just dropping the counted-by, split the vsc_tp_packet struct\ndefinition into a header and a full-packet definition and use a fixed\nsize buf[] in the packet definition, this way fortify-source buffer\noverrun checking still works when enabled."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-26T05:21:29.215Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3e243378f27cc7d11682a3ad720228b0723affa5"
        },
        {
          "url": "https://git.kernel.org/stable/c/ac04663c67f244810b3492e9ecd9f7cdbefeca2d"
        },
        {
          "url": "https://git.kernel.org/stable/c/00f1cc14da0f06d2897b8c528df7c7dcf1b8da50"
        }
      ],
      "title": "mei: vsc: Fix fortify-panic caused by invalid counted_by() use",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-37816",
    "datePublished": "2025-05-08T06:26:12.063Z",
    "dateReserved": "2025-04-16T04:51:23.946Z",
    "dateUpdated": "2025-05-26T05:21:29.215Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-37816\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-08T07:15:52.837\",\"lastModified\":\"2025-05-08T14:39:09.683\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmei: vsc: Fix fortify-panic caused by invalid counted_by() use\\n\\ngcc 15 honors the __counted_by(len) attribute on vsc_tp_packet.buf[]\\nand the vsc-tp.c code is using this in a wrong way. len does not contain\\nthe available size in the buffer, it contains the actual packet length\\n*without* the crc. So as soon as vsc_tp_xfer() tries to add the crc to\\nbuf[] the fortify-panic handler gets triggered:\\n\\n[   80.842193] memcpy: detected buffer overflow: 4 byte write of buffer size 0\\n[   80.842243] WARNING: CPU: 4 PID: 272 at lib/string_helpers.c:1032 __fortify_report+0x45/0x50\\n...\\n[   80.843175]  __fortify_panic+0x9/0xb\\n[   80.843186]  vsc_tp_xfer.cold+0x67/0x67 [mei_vsc_hw]\\n[   80.843210]  ? seqcount_lockdep_reader_access.constprop.0+0x82/0x90\\n[   80.843229]  ? lockdep_hardirqs_on+0x7c/0x110\\n[   80.843250]  mei_vsc_hw_start+0x98/0x120 [mei_vsc]\\n[   80.843270]  mei_reset+0x11d/0x420 [mei]\\n\\nThe easiest fix would be to just drop the counted-by but with the exception\\nof the ack buffer in vsc_tp_xfer_helper() which only contains enough room\\nfor the packet-header, all other uses of vsc_tp_packet always use a buffer\\nof VSC_TP_MAX_XFER_SIZE bytes for the packet.\\n\\nInstead of just dropping the counted-by, split the vsc_tp_packet struct\\ndefinition into a header and a full-packet definition and use a fixed\\nsize buf[] in the packet definition, this way fortify-source buffer\\noverrun checking still works when enabled.\"},{\"lang\":\"es\",\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/00f1cc14da0f06d2897b8c528df7c7dcf1b8da50\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3e243378f27cc7d11682a3ad720228b0723affa5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ac04663c67f244810b3492e9ecd9f7cdbefeca2d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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