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CVE-2025-38500 is a use-after-free and double-free vulnerability in the Linux kernel XFRM interface implementation, introduced in Linux 6.1. The xfrmi_changelink() function fails to reject changes to collect_md interfaces because its validation depends on xfrmi_locate(), which does not locate those interfaces. A change operation can consequently insert the special interface into the regular XFRM interface hash while it remains referenced by collect_md_xfrmi. This duplicate tracking can cause the interface to be freed twice during network-namespace teardown, triggering a kernel BUG and denial of service.
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A vulnerability affecting Google COS kernel packages sys-kernel/csql-kernel-6_12 and sys-kernel/csql-kernel-6_6. Its CVSS v3 base score is 7.1, indicating local exploitation requiring low privileges, with high integrity and availability impacts and no confidentiality impact. The reference does not describe the underlying flaw.
Unknown (the content only references the CVE identifier in the context of kernelCTF/LTS stability testing and fixes, without describing the vulnerability type or impact).
A Linux kernel XFRM interface use-after-free vulnerability triggered after changing a collect_md XFRM interface.
A use-after-free vulnerability in the Linux kernel XFRM interface after changing a collect_md XFRM interface.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.