{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-90274",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-11T19:38:34.797Z",
        "datePublished": "2026-09-17T16:08:07.269Z",
        "dateUpdated": "2026-10-19T09:00:51.909Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-19T09:00:51.909Z"
            },
            "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."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.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"
                    ],
                    "versions": [
                        {
                            "version": "2e1cdfe184b5202d51e0611d7a051e2bea303946",
                            "lessThan": "8d669db59f7283b838e029af29da12e505265fae",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2e1cdfe184b5202d51e0611d7a051e2bea303946",
                            "lessThan": "4091f2d5b26d117c992ffcce1a5df425a0daedcd",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2e1cdfe184b5202d51e0611d7a051e2bea303946",
                            "lessThan": "be7b2de5b9a96ae68ffa3528e0a40d63e0fd8148",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2e1cdfe184b5202d51e0611d7a051e2bea303946",
                            "lessThan": "4f9a0f548413bf864f609c9f4bc56e3f1b3577d4",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2e1cdfe184b5202d51e0611d7a051e2bea303946",
                            "lessThan": "1ade9a335c69fc735cb7b3f222ed35ab135540fb",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2e1cdfe184b5202d51e0611d7a051e2bea303946",
                            "lessThan": "5ac900f73ce1d4d8308f40752b51bc8a02b244d2",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2e1cdfe184b5202d51e0611d7a051e2bea303946",
                            "lessThan": "1674d9bff8073bdee5dbc200f56fc3caa28d0566",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.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"
                    ],
                    "versions": [
                        {
                            "version": "4.2",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.2",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.221",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.188",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.157",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.110",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.52",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.6",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.2",
                                    "versionEndExcluding": "5.15.221"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.2",
                                    "versionEndExcluding": "6.1.188"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.2",
                                    "versionEndExcluding": "6.6.157"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.2",
                                    "versionEndExcluding": "6.12.110"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.2",
                                    "versionEndExcluding": "6.18.52"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.2",
                                    "versionEndExcluding": "7.2.6"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.2",
                                    "versionEndExcluding": "7.3"
                                }
                            ]
                        }
                    ]
                }
            ],
            "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"
            }
        }
    }
}