CVE-2026-90274 (GCVE-0-2026-90274)
Vulnerability from cvelistv5
Published
2026-09-17 16:08
Modified
2026-10-19 09:00
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 2e1cdfe184b5202d51e0611d7a051e2bea303946
Version: 2e1cdfe184b5202d51e0611d7a051e2bea303946
Version: 2e1cdfe184b5202d51e0611d7a051e2bea303946
Version: 2e1cdfe184b5202d51e0611d7a051e2bea303946
Version: 2e1cdfe184b5202d51e0611d7a051e2bea303946
Version: 2e1cdfe184b5202d51e0611d7a051e2bea303946
Version: 2e1cdfe184b5202d51e0611d7a051e2bea303946
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "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"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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            "drivers/hwtracing/coresight/coresight-etm4x-sysfs.c",
            "drivers/hwtracing/coresight/coresight-etm4x.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "4.2"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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\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": "2026-10-19T09:00:51.909Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8d669db59f7283b838e029af29da12e505265fae"
        },
        {
          "url": "https://git.kernel.org/stable/c/4091f2d5b26d117c992ffcce1a5df425a0daedcd"
        },
        {
          "url": "https://git.kernel.org/stable/c/be7b2de5b9a96ae68ffa3528e0a40d63e0fd8148"
        },
        {
          "url": "https://git.kernel.org/stable/c/4f9a0f548413bf864f609c9f4bc56e3f1b3577d4"
        },
        {
          "url": "https://git.kernel.org/stable/c/1ade9a335c69fc735cb7b3f222ed35ab135540fb"
        },
        {
          "url": "https://git.kernel.org/stable/c/5ac900f73ce1d4d8308f40752b51bc8a02b244d2"
        },
        {
          "url": "https://git.kernel.org/stable/c/1674d9bff8073bdee5dbc200f56fc3caa28d0566"
        }
      ],
      "title": "coresight: etm4x: fix underflow for usage of (nrseqstate - 1)",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90274",
    "datePublished": "2026-09-17T16:08:07.269Z",
    "dateReserved": "2026-09-11T19:38:34.797Z",
    "dateUpdated": "2026-10-19T09:00:51.909Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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