CVE-2026-90274 (GCVE-0-2026-90274)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:08 – Updated: 2026-09-17 16:08
VLAI
Title
coresight: etm4x: fix underflow for usage of (nrseqstate - 1)
Summary
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 2e1cdfe184b5202d51e0611d7a051e2bea303946 , < 8d669db59f7283b838e029af29da12e505265fae (git)
Affected: 2e1cdfe184b5202d51e0611d7a051e2bea303946 , < 4091f2d5b26d117c992ffcce1a5df425a0daedcd (git)
Affected: 2e1cdfe184b5202d51e0611d7a051e2bea303946 , < be7b2de5b9a96ae68ffa3528e0a40d63e0fd8148 (git)
Affected: 2e1cdfe184b5202d51e0611d7a051e2bea303946 , < 4f9a0f548413bf864f609c9f4bc56e3f1b3577d4 (git)
Affected: 2e1cdfe184b5202d51e0611d7a051e2bea303946 , < 1ade9a335c69fc735cb7b3f222ed35ab135540fb (git)
Affected: 2e1cdfe184b5202d51e0611d7a051e2bea303946 , < 5ac900f73ce1d4d8308f40752b51bc8a02b244d2 (git)
Affected: 2e1cdfe184b5202d51e0611d7a051e2bea303946 , < 1674d9bff8073bdee5dbc200f56fc3caa28d0566 (git)
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Linux Linux Affected: 4.2
Unaffected: 0 , < 4.2 (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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            "drivers/hwtracing/coresight/coresight-etm4x-cfg.c",
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              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
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        {
          "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\u003cn\u003e 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\u003cn\u003e with drvdata-\u003enrseqstate - 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\u003cn\u003e relevant fields setup."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-17T16:08:07.269Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "cveId": "CVE-2026-90274",
    "datePublished": "2026-09-17T16:08:07.269Z",
    "dateReserved": "2026-09-11T19:38:34.797Z",
    "dateUpdated": "2026-09-17T16:08:07.269Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-09-25",
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      "cve": "CVE-2026-90274",
      "id": "msrc_CVE-2026-90274",
      "initial_release_date": "2026-09-19T01:15:17.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "coresight: etm4x: fix underflow for usage of (nrseqstate - 1)",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-90274.json",
      "version": "4"
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        "cveTags": [],
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            "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\u003cn\u003e 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\u003cn\u003e with drvdata-\u003enrseqstate - 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\u003cn\u003e relevant fields setup."
          }
        ],
        "id": "CVE-2026-90274",
        "lastModified": "2026-09-17T17:17:23.997",
        "metrics": {},
        "published": "2026-09-17T17:17:23.997",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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