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CVE-2025-68329— tracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于跟踪缓冲区映射不支持部分映射，可能导致WARN_ON触发。

AI Predicted 5.5 Difficulty: Easy EPSS 0.18% · P7

Possible ATT&CK Techniques 2 AI

T1044 T1057 · Process Discovery

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64< 922fdd0b755a84f9933b3ca195f60092b6bb88ee affected
cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64< 45053c12c45f0fb8ef6ab95118dd928d2fec0255 affected
cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64< b042fdf18e89a347177a49e795d8e5184778b5b6 affected
6.10 affected
< 6.10 unaffected
6.12.61≤ 6.12.* unaffected
6.17.11≤ 6.17.* unaffected
6.18≤ * unaffected
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I. Basic Information for CVE-2025-68329

Vulnerability Information
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Vulnerability Title
tracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于跟踪缓冲区映射不支持部分映射，可能导致WARN_ON触发。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64 ~ 922fdd0b755a84f9933b3ca195f60092b6bb88ee -
Linux Linux 6.10 -

II. Public POCs for CVE-2025-68329

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III. Intelligence Information for CVE-2025-68329

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Same Patch Batch · Linux · 2025-12-22 · 12 CVEs total

CVE-2025-68337 7.5 HIGH jbd2: avoid bug_on in jbd2_journal_get_create_access() when file system corrupted
CVE-2025-68336 7.5 HIGH locking/spinlock/debug: Fix data-race in do_raw_write_lock
CVE-2025-68335 comedi: pcl818: fix null-ptr-deref in pcl818_ai_cancel()
CVE-2025-68334 platform/x86/amd/pmc: Add support for Van Gogh SoC
CVE-2025-68333 sched_ext: Fix possible deadlock in the deferred_irq_workfn()
CVE-2025-68332 comedi: c6xdigio: Fix invalid PNP driver unregistration
CVE-2025-68331 usb: uas: fix urb unmapping issue when the uas device is remove during ongoing data transf
CVE-2025-68330 iio: accel: bmc150: Fix irq assumption regression
CVE-2025-68328 firmware: stratix10-svc: fix bug in saving controller data
CVE-2025-68327 usb: renesas_usbhs: Fix synchronous external abort on unbind
CVE-2025-68326 drm/xe/guc: Fix stack_depot usage

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-68329

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