coresight: ETR: Fix ETR buffer use-after-free issue

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In the Linux kernel, the following vulnerability has been resolved: coresight: ETR: Fix ETR buffer use-after-free issue When ETR is enabled as CS_MODE_SYSFS, if the buffer size is changed and enabled again, currently sysfs_buf will point to the newly allocated memory(buf_new) and free the old memory(buf_old). But the etr_buf that is being used by the ETR remains pointed to buf_old, not updated to buf_new. In this case, it will result in a memory use-after-free issue. Fix this by checking ETR's mode before updating and releasing buf_old, if the mode is CS_MODE_SYSFS, then skip updating and releasing it.

Source published

24 Dec 2025 10:33:05 UTC

Source modified

21 Oct 2026 12:38:21 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

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