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CVE-2026-90274

Unknown

Last modified

CVE-2026-90274 is a vulnerability of currently unknown severity. 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..

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 2e1cdfe184b5202d51e0611d7a051e2bea303946, < 8d669db59f7283b838e029af29da12e505265fae; >= 2e1cdfe184b5202d51e0611d7a051e2bea303946, < 4091f2d5b26d117c992ffcce1a5df425a0daedcd; >= 2e1cdfe184b5202d51e0611d7a051e2bea303946, < be7b2de5b9a96ae68ffa3528e0a40d63e0fd8148; >= 2e1cdfe184b5202d51e0611d7a051e2bea303946, < 4f9a0f548413bf864f609c9f4bc56e3f1b3577d4; >= 2e1cdfe184b5202d51e0611d7a051e2bea303946, < 1ade9a335c69fc735cb7b3f222ed35ab135540fb; >= 2e1cdfe184b5202d51e0611d7a051e2bea303946, < 5ac900f73ce1d4d8308f40752b51bc8a02b244d2; >= 2e1cdfe184b5202d51e0611d7a051e2bea303946, < 1674d9bff8073bdee5dbc200f56fc3caa28d0566
LinuxLinux4.2

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is 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.
How severe is CVE-2026-90274?
Severity scoring for CVE-2026-90274 is pending analysis.
How do I fix CVE-2026-90274?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST