High 7.8Published Oct 13, 2025

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

Updated under an hour ago (Oct 27, 2026, 8:00 PM ET)

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	3d8090bb53424432fa788fe9a49e8ceca74f0544 builds before 0baf92d0b1590b903c1f4ead75e61715e50e8146; from 2fc5b54368a1bf1d2d74b4d3b8eea5309a653e38 before 9fcedabaae0096f712bbb4ccca6a8538af1cd1c8; from 29e9158f91f99057dbd35db5e8674d93b38549fe before a78e55776522373c446f18d5002a8de4b09e6bf7; from 94f39804d891cffe4ce17737d295f3b195bc7299 before cd8ae32e4e4652db55bce6b9c79267d8946765a9; c67d4e7a8f90fb6361ca89d4d5c9a28f4e935e47; from 6.15.11 before 6.16	CNA record
linux linux_kernel linux:linux_kernel	from 6.6.103 before 6.6.109; from 6.12.43 before 6.12.50; from 6.15.11 before 6.16; from 6.16.2 before 6.16.10; 6.17; 6.17; 6.17; 6.17; and 3 more ranges	NVD

References

References

https://git.kernel.org/stable/c/0baf92d0b1590b903c1f4ead75e61715e50e8146	patch
https://git.kernel.org/stable/c/9fcedabaae0096f712bbb4ccca6a8538af1cd1c8	patch
https://git.kernel.org/stable/c/a78e55776522373c446f18d5002a8de4b09e6bf7	patch
https://git.kernel.org/stable/c/cd8ae32e4e4652db55bce6b9c79267d8946765a9	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.