Patchlage

CVE-2026-89748

CVE CVE-2026-89748EUVD EUVD-2026-76660Published 2026-09-11T19:46:53.000ZLast changed 2026-09-13T06:33:57.000ZCVSS 7.8

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: tracing: Fix retry exhaustion in simple ring buffer reader swap simple_ring_buffer_swap_reader_page() starts with retry set to 8 and post-decrements it only after a failed link replacement. On the final attempt, a successful replacement leaves retry at zero, while a failed replacement leaves it at -1. The current !retry test reverses both outcomes. It returns an error after a successful final replacement, leaving the link update complete but the reader bookkeeping unfinished. After a failed final replacement, it falls through and updates the head and reader pointers as though the replacement succeeded, which can corrupt the ring. Treat only a negative counter as exhaustion and return the documented -EBUSY error.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

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Carried in the product catalogue

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