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CVE-2026-90274
coresight: etm4x: fix underflow for usage of (nrseqstate - 1)
Overview
Description

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.

Details
INFO

Published Date :

Sept. 17, 2026, 5:17 p.m.

Last Modified :

Sept. 17, 2026, 5:17 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-90274 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Solution
Address underflow in CoreSight ETM4X by correcting sequence state handling.
  • Update the Linux kernel to the latest version.
  • Apply the patch for the coresight: etm4x vulnerability.
  • Introduce nr_seq_ctrls field to manage sequence states.
  • Utilize ETM_MAX_SEQ_TRANSITIONS macro for setup.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-90274.

URL 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
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-90274 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-90274 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-90274 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-90274 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Sep. 17, 2026

    Action Type Old Value New Value
    Added Description 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.
    Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/90xxx/CVE-2026-90274.json">CVE-2026-90274</a>
    Added Reference https://git.kernel.org/stable/c/1674d9bff8073bdee5dbc200f56fc3caa28d0566
    Added Reference https://git.kernel.org/stable/c/1ade9a335c69fc735cb7b3f222ed35ab135540fb
    Added Reference https://git.kernel.org/stable/c/4091f2d5b26d117c992ffcce1a5df425a0daedcd
    Added Reference https://git.kernel.org/stable/c/4f9a0f548413bf864f609c9f4bc56e3f1b3577d4
    Added Reference https://git.kernel.org/stable/c/5ac900f73ce1d4d8308f40752b51bc8a02b244d2
    Added Reference https://git.kernel.org/stable/c/8d669db59f7283b838e029af29da12e505265fae
    Added Reference https://git.kernel.org/stable/c/be7b2de5b9a96ae68ffa3528e0a40d63e0fd8148
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
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