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CVE-2025-39965— xfrm: xfrm_alloc_spi shouldn't use 0 as SPI

Quick assessment

Affected
Linux Linux
Exploitation
Public or AI PoC available; prioritize validation
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xfrm_alloc_spi错误使用0作为SPI值，可能导致释放后重用。

CVSS 7.8 · High EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1055 · Process Injection

Affected Version Matrix 9

VendorProduct Version RangeStatus
Linux Linux 3d8090bb53424432fa788fe9a49e8ceca74f0544< 0baf92d0b1590b903c1f4ead75e61715e50e8146 affected
2fc5b54368a1bf1d2d74b4d3b8eea5309a653e38< 9fcedabaae0096f712bbb4ccca6a8538af1cd1c8 affected
29e9158f91f99057dbd35db5e8674d93b38549fe< a78e55776522373c446f18d5002a8de4b09e6bf7 affected
94f39804d891cffe4ce17737d295f3b195bc7299< cd8ae32e4e4652db55bce6b9c79267d8946765a9 affected
c67d4e7a8f90fb6361ca89d4d5c9a28f4e935e47 affected
6.15.11< 6.16 affected
6.6.103< 6.6.109 affected
6.12.43< 6.12.50 affected
… +1 more rows
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I. Basic Information for CVE-2025-39965

Vulnerability Information
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Vulnerability Title
xfrm: xfrm_alloc_spi shouldn't use 0 as SPI
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: xfrm_alloc_spi shouldn't use 0 as SPI x->id.spi == 0 means "no SPI assigned", but since commit 94f39804d891 ("xfrm: Duplicate SPI Handling"), we now create states and add them to the byspi list with this value. __xfrm_state_delete doesn't remove those states from the byspi list, since they shouldn't be there, and this shows up as a UAF the next time we go through the byspi list.
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xfrm_alloc_spi错误使用0作为SPI值，可能导致释放后重用。
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 3d8090bb53424432fa788fe9a49e8ceca74f0544 ~ 0baf92d0b1590b903c1f4ead75e61715e50e8146 -
Linux Linux 6.6.103 ~ 6.6.109 -

II. Public POCs for CVE-2025-39965

# POC Description Source Link Shenlong Link
1 PoC for CVE-2025-39965 https://github.com/Shreyas-Penkar/CVE-2025-39965 POC Details
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III. Intelligence Information for CVE-2025-39965

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Patches & Fixes for CVE-2025-39965 (1)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39965

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