CVE-2025-68329

In the Linux kernel, the following vulnerability has been resolved: tracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs When a VMA is split (e.g., by partial munmap or MAP_FIXED), the kernel calls vm_ops->close on each portion. For trace buffer mappings, this results in ring_buffer_unmap() being called multiple times while ring_buffer_map() was only called once. This causes ring_buffer_unmap() to return -ENODEV on subsequent calls because user_mapped is already 0, triggering a WARN_ON. Trace buffer mappings cannot support partial mappings because the ring buffer structure requires the complete buffer including the meta page. Fix this by adding a may_split callback that returns -EINVAL to prevent VMA splits entirely.

CVSS

No CVSS.

References

Link	Resource
https://git.kernel.org/stable/c/45053c12c45f0fb8ef6ab95118dd928d2fec0255
https://git.kernel.org/stable/c/922fdd0b755a84f9933b3ca195f60092b6bb88ee
https://git.kernel.org/stable/c/b042fdf18e89a347177a49e795d8e5184778b5b6

Configurations

No configuration.

History

No history.

Information

Published : 2025-12-22 17:16

Updated : 2026-06-17 09:58

NVD link : CVE-2025-68329

Mitre link : CVE-2025-68329

CVE.ORG link : CVE-2025-68329

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2025-68329", "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": "cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64", "lessThan": "922fdd0b755a84f9933b3ca195f60092b6bb88ee", "versionType": "git"}, {"status": "affected", "version": "cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64", "lessThan": "45053c12c45f0fb8ef6ab95118dd928d2fec0255", "versionType": "git"}, {"status": "affected", "version": "cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64", "lessThan": "b042fdf18e89a347177a49e795d8e5184778b5b6", "versionType": "git"}], "programFiles": ["kernel/trace/trace.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": "6.12.61", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.17.11", "versionType": "semver", "lessThanOrEqual": "6.17.*"}, {"status": "unaffected", "version": "6.18", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["kernel/trace/trace.c"], "defaultStatus": "affected"}]}], "published": "2025-12-22T17:16:00.580", "references": [{"url": "https://git.kernel.org/stable/c/45053c12c45f0fb8ef6ab95118dd928d2fec0255", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/922fdd0b755a84f9933b3ca195f60092b6bb88ee", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/b042fdf18e89a347177a49e795d8e5184778b5b6", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Deferred", "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs\n\nWhen a VMA is split (e.g., by partial munmap or MAP_FIXED), the kernel\ncalls vm_ops->close on each portion. For trace buffer mappings, this\nresults in ring_buffer_unmap() being called multiple times while\nring_buffer_map() was only called once.\n\nThis causes ring_buffer_unmap() to return -ENODEV on subsequent calls\nbecause user_mapped is already 0, triggering a WARN_ON.\n\nTrace buffer mappings cannot support partial mappings because the ring\nbuffer structure requires the complete buffer including the meta page.\n\nFix this by adding a may_split callback that returns -EINVAL to prevent\nVMA splits entirely."}], "lastModified": "2026-06-17T09:58:56.677", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}