coresight: etm4x: fix underflow for usage of (nrseqstate - 1)
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.
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
- Added to Heist Feed
- Publisher date