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Description

In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Do not warn in ring_buffer_map_get_reader() when reader catches up The function ring_buffer_map_get_reader() is a bit more strict than the other get reader functions, and except for certain situations the rb_get_reader_page() should not return NULL. If it does, it triggers a warning. This warning was triggering but after looking at why, it was because another acceptable situation was happening and it wasn't checked for. If the reader catches up to the writer and there's still data to be read on the reader page, then the rb_get_reader_page() will return NULL as there's no new page to get. In this situation, the reader page should not be updated and no warning should trigger.

PUBLISHED Reserved 2025-12-16 | Published 2025-12-16 | Updated 2025-12-16 | Assigner Linux

Product status

Default status
unaffected

117c39200d9d760cbd5944bb89efb7b9c51965aa (git) before b42dbef4f208326271434d5ab71c4129a3ddd1a9
affected

117c39200d9d760cbd5944bb89efb7b9c51965aa (git) before 6f5c4f8109fa4d0955b3712597a26b310bdc736f
affected

117c39200d9d760cbd5944bb89efb7b9c51965aa (git) before aa997d2d2a0b2e76f4df0f1f12829f02acb4fb6b
affected

Default status
affected

6.10
affected

Any version before 6.10
unaffected

6.12.58 (semver)
unaffected

6.17.8 (semver)
unaffected

6.18 (original_commit_for_fix)
unaffected

References

git.kernel.org/...c/b42dbef4f208326271434d5ab71c4129a3ddd1a9

git.kernel.org/...c/6f5c4f8109fa4d0955b3712597a26b310bdc736f

git.kernel.org/...c/aa997d2d2a0b2e76f4df0f1f12829f02acb4fb6b

cve.org (CVE-2025-68186)

nvd.nist.gov (CVE-2025-68186)

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Data based on CVE®. Copyright © 1999-2025, The MITRE Corporation. All rights reserved.