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

Type: advisorySource: Official CVE List1 source record

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 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 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 relevant fields setup.

Announced Source revision 1
Original source ↗

CVE-2026-90274

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-90274

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "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",
        "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"
  }
]
Related CVEs
CVE-2026-90274

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#36631 · Revision 1
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Publisher date
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