tracing: Fix retry exhaustion in simple ring buffer reader swap

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89748
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:20:05 UTC
Updated2026-09-11 20:20:05 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 34e5b958bdad0f9cf16306368bbc2dc5b2a50143 df02489aa3aa1834659f0d20c89f7d212047d268 git Not specified
CNA Linux Linux affected 34e5b958bdad0f9cf16306368bbc2dc5b2a50143 e0d3aed7b12cf37b74c7cc5265073d0263b49cde git Not specified
CNA Linux Linux affected 7.1 Not specified
CNA Linux Linux unaffected 7.1 semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e0d3aed7b12cf37b74c7cc5265073d0263b49cde 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/df02489aa3aa1834659f0d20c89f7d212047d268 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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