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CVE-2026-90274

Estado: RecibidaSin puntuar—

In the Linux kernel, the following vulnerability has been resolved:

coresight: etm4x: fix underflow for usage of (nrseqstate - 1)

According to IHI006H Embedded Trace Macrocell Architecture Specification[0], TRCSEQEVR<n> is implemented only when TRCIDR5.NUMSEQSTATE is 0b100, in which case n ranges from 0 to 2; otherwise, TRCIDR5.NUMSEQSTATE is 0b000.

IOW, the number of usage in the initialisation or setting TRCSEQEVR<n> with drvdata->nrseqstate - 1 in the loop could make underflow issue when TRCIDR5.NUMSEQSTATE is 0b000.

Therefore, introduce nr_seq_ctrls field and untie it from nrseqstate. As part of this introduce ETM_MAX_SEQ_TRANSITIONS macro and apply nr_seq_ctrls and above macro to TRCSEQEVR<n> relevant fields setup.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-90274",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2e1cdfe184b5202d51e0611d7a051e2bea303946",
              "lessThan": "8d669db59f7283b838e029af29da12e505265fae",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2e1cdfe184b5202d51e0611d7a051e2bea303946",
              "lessThan": "4091f2d5b26d117c992ffcce1a5df425a0daedcd",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2e1cdfe184b5202d51e0611d7a051e2bea303946",
              "lessThan": "be7b2de5b9a96ae68ffa3528e0a40d63e0fd8148",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2e1cdfe184b5202d51e0611d7a051e2bea303946",
              "lessThan": "4f9a0f548413bf864f609c9f4bc56e3f1b3577d4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2e1cdfe184b5202d51e0611d7a051e2bea303946",
              "lessThan": "1ade9a335c69fc735cb7b3f222ed35ab135540fb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2e1cdfe184b5202d51e0611d7a051e2bea303946",
              "lessThan": "5ac900f73ce1d4d8308f40752b51bc8a02b244d2",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2e1cdfe184b5202d51e0611d7a051e2bea303946",
              "lessThan": "1674d9bff8073bdee5dbc200f56fc3caa28d0566",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/hwtracing/coresight/coresight-etm4x-cfg.c",
            "drivers/hwtracing/coresight/coresight-etm4x-core.c",
            "drivers/hwtracing/coresight/coresight-etm4x-sysfs.c",
            "drivers/hwtracing/coresight/coresight-etm4x.h"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.2"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.2",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/hwtracing/coresight/coresight-etm4x-cfg.c",
            "drivers/hwtracing/coresight/coresight-etm4x-core.c",
            "drivers/hwtracing/coresight/coresight-etm4x-sysfs.c",
            "drivers/hwtracing/coresight/coresight-etm4x.h"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-17T17:17:23.997",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/1674d9bff8073bdee5dbc200f56fc3caa28d0566",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/1ade9a335c69fc735cb7b3f222ed35ab135540fb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4091f2d5b26d117c992ffcce1a5df425a0daedcd",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4f9a0f548413bf864f609c9f4bc56e3f1b3577d4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5ac900f73ce1d4d8308f40752b51bc8a02b244d2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8d669db59f7283b838e029af29da12e505265fae",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/be7b2de5b9a96ae68ffa3528e0a40d63e0fd8148",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncoresight: etm4x: fix underflow for usage of (nrseqstate - 1)\n\nAccording to IHI006H Embedded Trace Macrocell Architecture\nSpecification[0], TRCSEQEVR<n> is implemented only when\nTRCIDR5.NUMSEQSTATE is 0b100, in which case n ranges from 0 to 2;\notherwise, TRCIDR5.NUMSEQSTATE is 0b000.\n\nIOW, the number of usage in the initialisation or setting\nTRCSEQEVR<n> with drvdata->nrseqstate - 1 in the loop could make\nunderflow issue when TRCIDR5.NUMSEQSTATE is 0b000.\n\nTherefore, introduce nr_seq_ctrls field and untie it from nrseqstate.\nAs part of this introduce ETM_MAX_SEQ_TRANSITIONS macro and\napply nr_seq_ctrls and above macro to TRCSEQEVR<n> relevant fields setup."
    }
  ],
  "lastModified": "2026-09-17T17:17:23.997",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}