Linux Kernel up to 7.2.5 coresight integer underflow

CVSS Meta Temp Score
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CTI Interest Score
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8.7$5k-$25k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.2.5. It has been classified as very critical. Affected by this issue is some unknown functionality of the component coresight. Performing a manipulation results in integer underflow. This vulnerability was named CVE-2026-90274. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as very critical, was found in Linux Kernel up to 7.2.5. This affects an unknown code block of the component coresight. The manipulation with an unknown input leads to a integer underflow vulnerability. CWE is classifying the issue as CWE-191. The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-90274 since 09/11/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Additional levels of successful authentication are necessary for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 09/17/2026).

Upgrading to version 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6 or 7.3-rc1 eliminates this vulnerability. Applying the patch 8d669db59f7283b838e029af29da12e505265fae/4091f2d5b26d117c992ffcce1a5df425a0daedcd/be7b2de5b9a96ae68ffa3528e0a40d63e0fd8148/4f9a0f548413bf864f609c9f4bc56e3f1b3577d4/1ade9a335c69fc735cb7b3f222ed35ab135540fb/5ac900f73ce1d4d8308f40752b51bc8a02b244d2/1674d9bff8073bdee5dbc200f56fc3caa28d0566 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.1
VulDB Meta Temp Score: 8.7

VulDB Base Score: 9.1
VulDB Temp Score: 8.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Integer underflow
CWE: CWE-191 / CWE-189
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.15.221/6.1.188/6.6.157/6.12.110/6.18.52/7.2.6/7.3-rc1
Patch: 8d669db59f7283b838e029af29da12e505265fae/4091f2d5b26d117c992ffcce1a5df425a0daedcd/be7b2de5b9a96ae68ffa3528e0a40d63e0fd8148/4f9a0f548413bf864f609c9f4bc56e3f1b3577d4/1ade9a335c69fc735cb7b3f222ed35ab135540fb/5ac900f73ce1d4d8308f40752b51bc8a02b244d2/1674d9bff8073bdee5dbc200f56fc3caa28d0566

Timelineinfo

09/11/2026 CVE reserved
09/17/2026 +6 days Advisory disclosed
09/17/2026 +0 days VulDB entry created
09/17/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-90274 (🔒)
GCVE (CVE): GCVE-0-2026-90274
GCVE (VulDB): GCVE-100-406803

Entryinfo

Created: 09/17/2026 21:16
Changes: 09/17/2026 21:16 (58)
Complete: 🔍
Cache ID: 216::103

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