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NVD / CVE Program· CNA Linux

CVE-2025-38563: perf/core: Prevent VMA split of buffer mappings

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.40% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 3bd518cc7ea61076bcd725e36ff0e690754977c0, 65311aad4c808bedad0c05d9bb8b06c47dae73eb, 6757a31a8e295ae4f01717a954afda173f25a121; azl3 kernel 6.6.96.2-2 on Azure Linux 3.0 6.6.104.2-1; cbl2 kernel 5.15.186.1-1 on CBL Mariner 2.0 5.15.200.1-1.

Low priority for now. Upgrade to Linux Linux 3bd518cc7ea61076bcd725e36ff0e690754977c0, 65311aad4c808bedad0c05d9bb8b06c47dae73eb, 6757a31a8e295ae4f01717a954afda173f25a121; azl3 kernel 6.6.96.2-2 on Azure Linux 3.0 6.6.104.2-1; cbl2 kernel 5.15.186.1-1 on CBL Mariner 2.0 5.15.200.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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 results in perf_mmap_open() calls, which take reference counts, but then the subsequent perf_mmap_close() calls are not longer fulfilling the offset and size checks. This leads to reference count leaks. As perf already has the requirement for subsequent mappings to match the initial mapping, the obvious consequence is that VMA splits, caused by resizing of a mapping or partial unmapping, have to be prevented. Implement the vm_operations_struct::may_split() callback and return unconditionally -EINVAL. That ensures that the mapping offsets and sizes cannot be changed after the fact. Remapping to a different fixed address with the same size is still possible as it takes the references for the new mapping and drops those of the old mapping.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Aug 19, 2025
Updated
Jun 17, 2026
EPSS
0.4% · 34th percentile
CWE
—

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

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  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
debiandebian linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux11.0
  • linux linux kernel5.5 and later · before 5.10.241
  • linux linux kernel5.11 and later · before 5.15.190
  • linux linux kernel5.16 and later · before 6.1.148
  • linux linux kernel4.1 and later · before 5.4.297
  • linux linux kernel6.7 and later · before 6.12.42
  • linux linux kernel6.13 and later · before 6.15.10
  • linux linux kernel6.16 and later · before 6.16.1
  • linux linux kernel6.2 and later · before 6.6.102

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.1affected
    • 45bfb2e50471abbbfd83d40d28c986078b0d24ff and later · before e4346ffec2c44d6b0be834d59b20632b5bb5729eaffected · git
    • 45bfb2e50471abbbfd83d40d28c986078b0d24ff and later · before d52451a9210f2e5a079ba052918c93563518a9ffaffected · git
    • 45bfb2e50471abbbfd83d40d28c986078b0d24ff and later · before 3bd518cc7ea61076bcd725e36ff0e690754977c0affected · git
    • 45bfb2e50471abbbfd83d40d28c986078b0d24ff and later · before 7b84cb58d1f0aa07656802eae24689566e5f5b1baffected · git
    • 45bfb2e50471abbbfd83d40d28c986078b0d24ff and later · before 6757a31a8e295ae4f01717a954afda173f25a121affected · git
    • 45bfb2e50471abbbfd83d40d28c986078b0d24ff and later · before e529888b7e8092912dd8789bdfc76685ccd2ff5faffected · git
    • 45bfb2e50471abbbfd83d40d28c986078b0d24ff and later · before ff668930871e0198c7f4e325058b8b7c286787bdaffected · git
    • 45bfb2e50471abbbfd83d40d28c986078b0d24ff and later · before 65311aad4c808bedad0c05d9bb8b06c47dae73ebaffected · git
    • 45bfb2e50471abbbfd83d40d28c986078b0d24ff and later · before b024d7b56c77191cde544f838debb7f8451cd0d6affected · git

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.148-16.1.148-1
Debian:13linuxbefore 6.12.43-16.12.43-1
Debian:14linuxbefore 6.16.3-16.16.3-1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-64kbbefore 5.14.21-150400.24.176.15.14.21-150400.24.176.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-docsbefore 5.14.21-150400.24.176.15.14.21-150400.24.176.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-obs-buildbefore 5.14.21-150400.24.176.15.14.21-150400.24.176.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-sourcebefore 5.14.21-150400.24.176.15.14.21-150400.24.176.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-symsbefore 5.14.21-150400.24.176.15.14.21-150400.24.176.1
SUSE:Linux Enterprise Micro 5.1kernel-rtbefore 5.3.18-150300.220.15.3.18-150300.220.1
SUSE:Linux Enterprise Micro 5.1kernel-source-rtbefore 5.3.18-150300.220.15.3.18-150300.220.1
SUSE:Linux Enterprise Micro 5.2kernel-defaultbefore 5.3.18-150300.59.235.15.3.18-150300.59.235.1
SUSE:Linux Enterprise Micro 5.2kernel-default-basebefore 5.3.18-150300.59.235.1.150300.18.140.15.3.18-150300.59.235.1.150300.18.140.1
SUSE:Linux Enterprise Micro 5.2kernel-rtbefore 5.3.18-150300.235.15.3.18-150300.235.1
SUSE:Linux Enterprise Micro 5.2kernel-source-rtbefore 5.3.18-150300.235.15.3.18-150300.235.1
SUSE:Linux Enterprise Micro 5.3kernel-defaultbefore 5.14.21-150400.24.176.15.14.21-150400.24.176.1
SUSE:Linux Enterprise Micro 5.3kernel-default-basebefore 5.14.21-150400.24.176.1.150400.24.90.15.14.21-150400.24.176.1.150400.24.90.1
SUSE:Linux Enterprise Micro 5.3kernel-rtbefore 5.14.21-150400.15.130.15.14.21-150400.15.130.1
SUSE:Linux Enterprise Micro 5.3kernel-source-rtbefore 5.14.21-150400.15.130.15.14.21-150400.15.130.1
SUSE:Linux Enterprise Micro 5.5kernel-rtbefore 5.14.21-150500.13.106.15.14.21-150500.13.106.1
SUSE:Linux Enterprise Micro 5.5kernel-source-rtbefore 5.14.21-150500.13.106.15.14.21-150500.13.106.1
SUSE:Linux Enterprise Server 15 SP4-LTSSkernel-zfcpdumpbefore 5.14.21-150400.24.176.15.14.21-150400.24.176.1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2025-38561Aug 19, 2025 · ksmbd: fix Preauh_HashValue race condition
    18Monitor
  • ← EarlierCVE-2025-38562Aug 19, 2025 · ksmbd: fix null pointer dereference error in generate_encryptionkey
    26Monitor
  • Later →CVE-2025-38564Aug 19, 2025 · perf/core: Handle buffer mapping fail correctly in perf_mmap()
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux3bd518cc7ea61076bcd725e36ff0e690754977c0Vendor (CNA)
Linux Linux65311aad4c808bedad0c05d9bb8b06c47dae73ebVendor (CNA)
Linux Linux6757a31a8e295ae4f01717a954afda173f25a121Vendor (CNA)
Linux Linux7b84cb58d1f0aa07656802eae24689566e5f5b1bVendor (CNA)
Linux Linuxb024d7b56c77191cde544f838debb7f8451cd0d6Vendor (CNA)
Linux Linuxd52451a9210f2e5a079ba052918c93563518a9ffVendor (CNA)
Linux Linuxe4346ffec2c44d6b0be834d59b20632b5bb5729eVendor (CNA)
Linux Linuxe529888b7e8092912dd8789bdfc76685ccd2ff5fVendor (CNA)
Linux Linuxff668930871e0198c7f4e325058b8b7c286787bdVendor (CNA)
azl3 kernel 6.6.96.2-2 on Azure Linux 3.06.6.104.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.186.1-1 on CBL Mariner 2.05.15.200.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.148-1 · Debian:12Package registry (OSV)
suse:kernel-64kb5.14.21-150400.24.176.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSPackage registry (OSV)
suse:kernel-default5.14.21-150400.24.176.1 · SUSE:Linux Enterprise Micro 5.3Package registry (OSV)
suse:kernel-default-base5.14.21-150400.24.176.1.150400.24.90.1 · SUSE:Linux Enterprise Micro 5.3Package registry (OSV)
suse:kernel-docs5.14.21-150400.24.176.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSPackage registry (OSV)
suse:kernel-obs-build5.14.21-150400.24.176.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSPackage registry (OSV)
suse:kernel-rt5.14.21-150500.13.106.1 · SUSE:Linux Enterprise Micro 5.5Package registry (OSV)
suse:kernel-source5.14.21-150400.24.176.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSPackage registry (OSV)
suse:kernel-source-rt5.14.21-150500.13.106.1 · SUSE:Linux Enterprise Micro 5.5Package registry (OSV)
suse:kernel-syms5.14.21-150400.24.176.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSPackage registry (OSV)
suse:kernel-zfcpdump5.14.21-150400.24.176.1 · SUSE:Linux Enterprise Server 15 SP4-LTSSPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (11 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records