Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 34e5b958bdad0f9cf16306368bbc2dc5b2a50143 before df02489aa3aa1834659f0d20c89f7d212047d268; affected 34e5b958bdad0f9cf16306368bbc2dc5b2a50143 before e0d3aed7b12cf37b74c7cc5265073d0263b49cde |
| Linux / Linux | affected 7.1; unaffected 0 before 7.1; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.