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CVE-2026-90273: coresight: etm4x: missing cscfg_csdev_disable_active_config() in perf enable

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: coresight: etm4x: missing cscfg_csdev_disable_active_config() in perf enable In the perf enable path, there are missing cases where cscfg_csdev_disable_active_config() is not called: - Branch broadcast is selected but not supported by the hardware - etm4_enable_hw() fails This can lead to a leak of config_desc->active_cnt. Fix this by properly calling cscfg_csdev_disable_active_config() in these error paths.

Affected products

• Linux: 5.15 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0a47f0be6557b4a851addd430383a4dc7ee08752
• https://git.kernel.org/stable/c/26f9e89bad5a7e3005d3dc97a2e2fa6d6b2b8bb6
• https://git.kernel.org/stable/c/7e4f2702bbadbde887a5d8897297720a7f037ee5
• https://git.kernel.org/stable/c/ba63c62d4252f6bc58fd2a567075c72d03332562
• https://git.kernel.org/stable/c/d5f3dae82705d9388434892915008da3bb83c4ba
• https://git.kernel.org/stable/c/f097b6969e9961365358fc5ba5892db2f284f020

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