{"cve":"CVE-2026-90274","nvd":{"published":"2026-09-17T17:17:23.997","modified":"2026-10-19T09:19:20.947","status":"Received","description":"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.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/1674d9bff8073bdee5dbc200f56fc3caa28d0566","https://git.kernel.org/stable/c/1ade9a335c69fc735cb7b3f222ed35ab135540fb","https://git.kernel.org/stable/c/4091f2d5b26d117c992ffcce1a5df425a0daedcd","https://git.kernel.org/stable/c/4f9a0f548413bf864f609c9f4bc56e3f1b3577d4","https://git.kernel.org/stable/c/5ac900f73ce1d4d8308f40752b51bc8a02b244d2"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:55:23.253742848+00:00"},"epss":{"cve":"CVE-2026-90274","score":0.00173,"percentile":0.0661,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}