CVE-2025-68186

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.

CVSS

No CVSS.

References

Link	Resource
https://git.kernel.org/stable/c/6f5c4f8109fa4d0955b3712597a26b310bdc736f
https://git.kernel.org/stable/c/aa997d2d2a0b2e76f4df0f1f12829f02acb4fb6b
https://git.kernel.org/stable/c/b42dbef4f208326271434d5ab71c4129a3ddd1a9

Configurations

No configuration.

History

No history.

Information

Published : 2025-12-16 14:15

Updated : 2026-06-17 09:58

NVD link : CVE-2025-68186

Mitre link : CVE-2025-68186

CVE.ORG link : CVE-2025-68186

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2025-68186", "cveTags": [], "metrics": {}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "117c39200d9d760cbd5944bb89efb7b9c51965aa", "lessThan": "b42dbef4f208326271434d5ab71c4129a3ddd1a9", "versionType": "git"}, {"status": "affected", "version": "117c39200d9d760cbd5944bb89efb7b9c51965aa", "lessThan": "6f5c4f8109fa4d0955b3712597a26b310bdc736f", "versionType": "git"}, {"status": "affected", "version": "117c39200d9d760cbd5944bb89efb7b9c51965aa", "lessThan": "aa997d2d2a0b2e76f4df0f1f12829f02acb4fb6b", "versionType": "git"}], "programFiles": ["kernel/trace/ring_buffer.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.10"}, {"status": "unaffected", "version": "0", "lessThan": "6.10", "versionType": "semver"}, {"status": "unaffected", "version": "6.12.58", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.17.8", "versionType": "semver", "lessThanOrEqual": "6.17.*"}, {"status": "unaffected", "version": "6.18", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["kernel/trace/ring_buffer.c"], "defaultStatus": "affected"}]}], "published": "2025-12-16T14:15:51.240", "references": [{"url": "https://git.kernel.org/stable/c/6f5c4f8109fa4d0955b3712597a26b310bdc736f", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/aa997d2d2a0b2e76f4df0f1f12829f02acb4fb6b", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/b42dbef4f208326271434d5ab71c4129a3ddd1a9", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Deferred", "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Do not warn in ring_buffer_map_get_reader() when reader catches up\n\nThe function ring_buffer_map_get_reader() is a bit more strict than the\nother get reader functions, and except for certain situations the\nrb_get_reader_page() should not return NULL. If it does, it triggers a\nwarning.\n\nThis warning was triggering but after looking at why, it was because\nanother acceptable situation was happening and it wasn't checked for.\n\nIf the reader catches up to the writer and there's still data to be read\non the reader page, then the rb_get_reader_page() will return NULL as\nthere's no new page to get.\n\nIn this situation, the reader page should not be updated and no warning\nshould trigger."}], "lastModified": "2026-06-17T09:58:42.233", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}