{"id":"CVE-2026-90274","title":"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 …","summary":"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 …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 2e1cdfe184b5202d51e0611d7a051e2bea303946 < 8d669db59f7283b838e029af29da12e505265fae","Linux >= 2e1cdfe184b5202d51e0611d7a051e2bea303946 < 4091f2d5b26d117c992ffcce1a5df425a0daedcd","Linux >= 2e1cdfe184b5202d51e0611d7a051e2bea303946 < be7b2de5b9a96ae68ffa3528e0a40d63e0fd8148","Linux >= 2e1cdfe184b5202d51e0611d7a051e2bea303946 < 4f9a0f548413bf864f609c9f4bc56e3f1b3577d4","Linux >= 2e1cdfe184b5202d51e0611d7a051e2bea303946 < 1ade9a335c69fc735cb7b3f222ed35ab135540fb","Linux >= 2e1cdfe184b5202d51e0611d7a051e2bea303946 < 5ac900f73ce1d4d8308f40752b51bc8a02b244d2","Linux >= 2e1cdfe184b5202d51e0611d7a051e2bea303946 < 1674d9bff8073bdee5dbc200f56fc3caa28d0566","Linux 4.2"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:17:23.997","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90274","references":[{"url":"https://git.kernel.org/stable/c/1674d9bff8073bdee5dbc200f56fc3caa28d0566","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1ade9a335c69fc735cb7b3f222ed35ab135540fb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4091f2d5b26d117c992ffcce1a5df425a0daedcd","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4f9a0f548413bf864f609c9f4bc56e3f1b3577d4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5ac900f73ce1d4d8308f40752b51bc8a02b244d2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8d669db59f7283b838e029af29da12e505265fae","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/be7b2de5b9a96ae68ffa3528e0a40d63e0fd8148","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-17T16:21:47.837Z","epss":0.00173,"epssPercentile":0.05845,"slug":"CVE-2026-90274","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}