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CVE-2025-21734— misc: fastrpc: Fix copy buffer page size

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fastrpc驱动在计算页面大小时未考虑偏移量，可能导致越界读取。

CVSS 7.8 · High EPSS 0.20% · P10

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 02b45b47fbe84e23699bb6bdc74d4c2780e282b4< c56ba3ea8e3c9a69a992aad18f7a65e43e51d623 affected
02b45b47fbe84e23699bb6bdc74d4c2780e282b4< c0464bad0e85fcd5d47e4297d1e410097c979e55 affected
02b45b47fbe84e23699bb6bdc74d4c2780e282b4< 24a79c6bc8de763f7c50f4f84f8b0c183bc25a51 affected
02b45b47fbe84e23699bb6bdc74d4c2780e282b4< c3f7161123fcbdc64e90119ccce292d8b66281c4 affected
02b45b47fbe84e23699bb6bdc74d4c2780e282b4< e966eae72762ecfdbdb82627e2cda48845b9dd66 affected
5.2 affected
< 5.2 unaffected
6.1.129≤ 6.1.* unaffected
… +4 more rows
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I. Basic Information for CVE-2025-21734

Vulnerability Information
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Vulnerability Title
misc: fastrpc: Fix copy buffer page size
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: Fix copy buffer page size For non-registered buffer, fastrpc driver copies the buffer and pass it to the remote subsystem. There is a problem with current implementation of page size calculation which is not considering the offset in the calculation. This might lead to passing of improper and out-of-bounds page size which could result in memory issue. Calculate page start and page end using the offset adjusted address instead of absolute address.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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fastrpc驱动在计算页面大小时未考虑偏移量，可能导致越界读取。
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 02b45b47fbe84e23699bb6bdc74d4c2780e282b4 ~ c56ba3ea8e3c9a69a992aad18f7a65e43e51d623 -
Linux Linux 5.2 -

II. Public POCs for CVE-2025-21734

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III. Intelligence Information for CVE-2025-21734

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Patches & Fixes for CVE-2025-21734 (5)

Same Patch Batch · Linux · 2025-02-27 · 177 CVEs total

CVE-2025-21805 9.8 CRITICAL RDMA/rtrs: Add missing deinit() call
CVE-2025-21707 9.8 CRITICAL mptcp: consolidate suboption status
CVE-2025-21748 9.8 CRITICAL ksmbd: fix integer overflows on 32 bit systems
CVE-2025-21796 9.8 CRITICAL nfsd: clear acl_access/acl_default after releasing them
CVE-2024-58006 9.6 CRITICAL PCI: dwc: ep: Prevent changing BAR size/flags in pci_epc_set_bar()
CVE-2024-57997 8.8 HIGH wifi: wcn36xx: fix channel survey memory allocation size
CVE-2024-57995 8.8 HIGH wifi: ath12k: fix read pointer after free in ath12k_mac_assign_vif_to_vdev()
CVE-2024-57999 8.8 HIGH powerpc/pseries/iommu: IOMMU incorrectly marks MMIO range in DDW
CVE-2025-21735 8.8 HIGH NFC: nci: Add bounds checking in nci_hci_create_pipe()
CVE-2025-21710 8.2 HIGH tcp: correct handling of extreme memory squeeze
CVE-2024-57973 8.1 HIGH rdma/cxgb4: Prevent potential integer overflow on 32bit
CVE-2025-21760 8.1 HIGH ndisc: extend RCU protection in ndisc_send_skb()
CVE-2025-21762 8.1 HIGH arp: use RCU protection in arp_xmit()
CVE-2025-21766 8.1 HIGH ipv4: use RCU protection in __ip_rt_update_pmtu()
CVE-2025-21765 8.1 HIGH ipv6: use RCU protection in ip6_default_advmss()
CVE-2025-21738 7.8 HIGH ata: libata-sff: Ensure that we cannot write outside the allocated buffer
CVE-2025-21730 7.8 HIGH wifi: rtw89: avoid to init mgnt_entry list twice when WoWLAN failed
CVE-2025-21729 7.8 HIGH wifi: rtw89: fix race between cancel_hw_scan and hw_scan completion
CVE-2025-21751 7.8 HIGH net/mlx5: HWS, change error flow on matcher disconnect
CVE-2025-21718 7.8 HIGH net: rose: fix timer races against user threads

Showing top 20 of 177 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21734

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