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Vulnerabilities

Vulnerability · CVE-2025-38563

In the Linux kernel, the following vulnerability has been resolved: perf/core: Prevent VMA split of buffer mappings The perf mmap code is careful about mmap()'ing the user page wit

Published Aug 19, 2025 · catalog updated May 11, 2026 · Linux Linux

Check this week

CVE-2025-38563 is not in CISA KEV. FIRST estimates a 41.00% chance of exploitation in the next 30 days. Check whether you run Linux Linux.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
None0.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
41.00%
Remediation
Version ranges on file
Affected products
vendor Linux Linux 45bfb2e50471abbbfd83d40d28c986078b0d24ff <65311aad4c808bedad0c05d9bb8b06c47dae73eb

In the Linux kernel, the following vulnerability has been resolved: perf/core: Prevent VMA split of buffer mappings The perf mmap code is careful about mmap()'ing the user page with the ringbuffer and additionally the auxiliary buffer, when the event supports it. Once the first mapping is established, subsequent mapping have to use the same offset and the same size in both cases. The reference counting for the ringbuffer and the auxiliary buffer depends on this being correct. Though perf does not prevent that a related mapping is split via mmap(2), munmap(2) or mremap(2). A split of a VMA resu

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Linux Linux 45bfb2e50471abbbfd83d40d28c986078b0d24ff <65311aad4c808bedad0c05d9bb8b06c47dae73eb45bfb2e50471abbbfd83d40d28c986078b0d24ff <65311aad4c808bedad0c05d9bb8b06c47dae73eb

How to fix CVE-2025-38563

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-38563 is not in CISA KEV. FIRST estimates a 41.00% chance of exploitation in the next 30 days. Check whether you run Linux Linux.

Which versions are affected?

Compare what you have installed with Linux Linux 45bfb2e50471abbbfd83d40d28c986078b0d24ff <65311aad4c808bedad0c05d9bb8b06c47dae73eb 45bfb2e50471abbbfd83d40d28c986078b0d24ff <65311aad4c808bedad0c05d9bb8b06c47dae73eb. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 41.00%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 19, 2025 · EUVD

    Detected

    In the Linux kernel, the following vulnerability has been resolved: perf/core: Prevent VMA split of buffer mappings The perf mmap code is careful about mmap()'ing the user page with the ringbuffer and additionally the auxiliary buffer, when the event supports it. Once the first mapping is established, subsequent mapping have to use the same offset and the same size in both cases. The reference cou

  2. May 11, 2026 · EUVD

    Updated

    In the Linux kernel, the following vulnerability has been resolved: perf/core: Prevent VMA split of buffer mappings The perf mmap code is careful about mmap()'ing the user page with the ringbuffer and additionally the auxiliary buffer, when the event supports it. Once the first mapping is established, subsequent mapping have to use the same offset and the same size in both cases. The reference cou

Sources

  • CVE.orgVulnerability recordCVE-2025-38563

    Official CVE identifier

    cve.org
  • EUVDVulnerability recordEUVD-2025-26105

    In the Linux kernel, the following vulnerability has been resolved: perf/core: Prevent VMA split of buffer mappings The perf mmap code is careful about mmap()'ing the user page with the ringbuffer and additionally the auxiliary buffer, when the event supports it. Once the first m

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog May 11, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.