CVE-2026-90274

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.

CVSS

No CVSS.

References

Link	Resource
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
https://git.kernel.org/stable/c/8d669db59f7283b838e029af29da12e505265fae
https://git.kernel.org/stable/c/be7b2de5b9a96ae68ffa3528e0a40d63e0fd8148

Configurations

No configuration.

History

17 Sep 2026, 17:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-17 17:17

Updated : 2026-09-17 17:17

NVD link : CVE-2026-90274

Mitre link : CVE-2026-90274

CVE.ORG link : CVE-2026-90274

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2026-90274", "cveTags": [], "metrics": {}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"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-rc1", "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"}]}], "published": "2026-09-17T17:17:23.997", "references": [{"url": "https://git.kernel.org/stable/c/1674d9bff8073bdee5dbc200f56fc3caa28d0566", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/1ade9a335c69fc735cb7b3f222ed35ab135540fb", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/4091f2d5b26d117c992ffcce1a5df425a0daedcd", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/4f9a0f548413bf864f609c9f4bc56e3f1b3577d4", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/5ac900f73ce1d4d8308f40752b51bc8a02b244d2", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/8d669db59f7283b838e029af29da12e505265fae", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/be7b2de5b9a96ae68ffa3528e0a40d63e0fd8148", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Received", "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."}], "lastModified": "2026-09-17T17:17:23.997", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}