CVE-2026-90274
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.
How to fix
- Linux Linux8d669db59f7283b838e029af29da12e505265fae, 4091f2d5b26d117c992ffcce1a5df425a0daedcd, be7b2de5b9a96ae68ffa3528e0a40d63e0fd8148, 4f9a0f548413bf864f609c9f4bc56e3f1b3577d4, 1ade9a335c69fc735cb7b3f222ed35ab135540fb, 5ac900f73ce1d4d8308f40752b51bc8a02b244d2, 1674d9bff8073bdee5dbc200f56fc3caa28d0566 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 2e1cdfe184b5202d51e0611d7a051e2bea303946 ≤ v < 8d669db59f7283b838e029af29da12e505265fae, 2e1cdfe184b5202d51e0611d7a051e2bea303946 ≤ v < 4091f2d5b26d117c992ffcce1a5df425a0daedcd, 2e1cdfe184b5202d51e0611d7a051e2bea303946 ≤ v < be7b2de5b9a96ae68ffa3528e0a40d63e0fd8148, 2e1cdfe184b5202d51e0611d7a051e2bea303946 ≤ v < 4f9a0f548413bf864f609c9f4bc56e3f1b3577d4, 2e1cdfe184b5202d51e0611d7a051e2bea303946 ≤ v < 1ade9a335c69fc735cb7b3f222ed35ab135540fb, 2e1cdfe184b5202d51e0611d7a051e2bea303946 ≤ v < 5ac900f73ce1d4d8308f40752b51bc8a02b244d2, 2e1cdfe184b5202d51e0611d7a051e2bea303946 ≤ v < 1674d9bff8073bdee5dbc200f56fc3caa28d0566, 4.2 | 8d669db59f7283b838e029af29da12e505265fae, 4091f2d5b26d117c992ffcce1a5df425a0daedcd, be7b2de5b9a96ae68ffa3528e0a40d63e0fd8148, 4f9a0f548413bf864f609c9f4bc56e3f1b3577d4, 1ade9a335c69fc735cb7b3f222ed35ab135540fb, 5ac900f73ce1d4d8308f40752b51bc8a02b244d2, 1674d9bff8073bdee5dbc200f56fc3caa28d0566 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.