CVE-2026-89748 is a vulnerability in Linux Kernel
Published on September 11, 2026
tracing: Fix retry exhaustion in simple ring buffer reader swap
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.
Products Associated with CVE-2026-89748
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Affected Versions
Linux:- Version 34e5b958bdad0f9cf16306368bbc2dc5b2a50143 and below df02489aa3aa1834659f0d20c89f7d212047d268 is affected.
- Version 34e5b958bdad0f9cf16306368bbc2dc5b2a50143 and below e0d3aed7b12cf37b74c7cc5265073d0263b49cde is affected.
- Version 7.1 is affected.
- Before 7.1 is unaffected.
- Version 7.2.4, <= 7.2.* is unaffected.
- Version 7.3-rc1, <= * is unaffected.