CVE-2025-39965 – xfrm: xfrm_alloc_spi shouldn’t use 0 as SPI

CVE ID : CVE-2025-39965

Published : Oct. 13, 2025, 2:15 p.m. | 24 minutes ago

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.

Severity: 0.0 | NA

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