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

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是美国等都是美国(Linux)基金会的产品。Linux kernel是开源操作系统Linux所使用的内核。ops等都是的产品。ops是一个用于开发和测试 Kubernetes 和 machine charms 的 Python 框架。roc req等都是(roc)个人开发者的产品。req是一个使用 Black Magic 的简单 Go HTTP 客户端。 Linux kernel存在安全漏洞，该漏洞源于未防止VMA分割，可能导致引用计数泄漏。

AI Predicted 3.3 Difficulty: Moderate EPSS 0.40% · P34

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 45bfb2e50471abbbfd83d40d28c986078b0d24ff< e4346ffec2c44d6b0be834d59b20632b5bb5729e affected
45bfb2e50471abbbfd83d40d28c986078b0d24ff< d52451a9210f2e5a079ba052918c93563518a9ff affected
45bfb2e50471abbbfd83d40d28c986078b0d24ff< 3bd518cc7ea61076bcd725e36ff0e690754977c0 affected
45bfb2e50471abbbfd83d40d28c986078b0d24ff< 7b84cb58d1f0aa07656802eae24689566e5f5b1b affected
45bfb2e50471abbbfd83d40d28c986078b0d24ff< 6757a31a8e295ae4f01717a954afda173f25a121 affected
45bfb2e50471abbbfd83d40d28c986078b0d24ff< e529888b7e8092912dd8789bdfc76685ccd2ff5f affected
45bfb2e50471abbbfd83d40d28c986078b0d24ff< ff668930871e0198c7f4e325058b8b7c286787bd affected
45bfb2e50471abbbfd83d40d28c986078b0d24ff< 65311aad4c808bedad0c05d9bb8b06c47dae73eb affected
… +12 more rows
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I. Basic Information for CVE-2025-38563

Vulnerability Information
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Vulnerability Title
perf/core: Prevent VMA split of buffer mappings
Source: CVE Program / CVE List V5
Vulnerability Description
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.
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是美国等都是美国(Linux)基金会的产品。Linux kernel是开源操作系统Linux所使用的内核。ops等都是的产品。ops是一个用于开发和测试 Kubernetes 和 machine charms 的 Python 框架。roc req等都是(roc)个人开发者的产品。req是一个使用 Black Magic 的简单 Go HTTP 客户端。 Linux kernel存在安全漏洞，该漏洞源于未防止VMA分割，可能导致引用计数泄漏。
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 45bfb2e50471abbbfd83d40d28c986078b0d24ff ~ e4346ffec2c44d6b0be834d59b20632b5bb5729e -
Linux Linux 4.1 -

II. Public POCs for CVE-2025-38563

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III. Intelligence Information for CVE-2025-38563

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Vendor Advisories for CVE-2025-38563 (1)

Same Patch Batch · Linux · 2025-08-19 · 59 CVEs total

CVE-2025-38561 9.8 CRITICAL ksmbd: fix Preauh_HashValue race condition
CVE-2025-38566 9.8 CRITICAL sunrpc: fix handling of server side tls alerts
CVE-2025-38560 9.3 CRITICAL x86/sev: Evict cache lines during SNP memory validation
CVE-2025-38601 8.8 HIGH wifi: ath11k: clear initialized flag for deinit-ed srng lists
CVE-2025-38600 8.8 HIGH wifi: mt76: mt7925: fix off by one in mt7925_mcu_hw_scan()
CVE-2025-38599 8.8 HIGH wifi: mt76: mt7996: Fix possible OOB access in mt7996_tx()
CVE-2025-38592 8.8 HIGH Bluetooth: hci_devcd_dump: fix out-of-bounds via dev_coredumpv
CVE-2025-38608 8.6 HIGH bpf, ktls: Fix data corruption when using bpf_msg_pop_data() in ktls
CVE-2025-38574 8.6 HIGH pptp: ensure minimal skb length in pptp_xmit()
CVE-2025-38571 8.2 HIGH sunrpc: fix client side handling of tls alerts
CVE-2025-38595 7.8 HIGH xen: fix UAF in dmabuf_exp_from_pages()
CVE-2025-38580 7.8 HIGH ext4: fix inode use after free in ext4_end_io_rsv_work()
CVE-2025-38607 7.8 HIGH bpf: handle jset (if a & b ...) as a jump in CFG computation
CVE-2025-38614 7.8 HIGH eventpoll: Fix semi-unbounded recursion
CVE-2025-38615 7.8 HIGH fs/ntfs3: cancle set bad inode after removing name fails
CVE-2025-38604 7.8 HIGH wifi: rtl818x: Kill URBs before clearing tx status queue
CVE-2025-38593 7.8 HIGH Bluetooth: hci_sync: fix double free in 'hci_discovery_filter_clear()'
CVE-2025-38586 7.8 HIGH bpf, arm64: Fix fp initialization for exception boundary
CVE-2025-38582 7.8 HIGH RDMA/hns: Fix double destruction of rsv_qp
CVE-2025-38555 7.8 HIGH usb: gadget : fix use-after-free in composite_dev_cleanup()

Showing top 20 of 59 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-38563

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