CVE-2026-98370
Received
Received - Intake
Use-After-Free in Linux Kernel XFRM Subsystem
Vulnerability report for CVE-2026-98370, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-06
Last updated on: 2026-10-06
Assigner: kernel.org
Description
Description
In the Linux kernel, the following vulnerability has been resolved:
xfrm: fix compat ALLOCSPI request use-after-free
xfrm_state_netlink() builds the ALLOCSPI response with
dump_one_state(), which already calls alloc_compat() with the response
skb and header.
xfrm_alloc_userspi() then calls alloc_compat() again, but passes the
original request skb and its header. For a compat request, the
translator therefore interprets the 228-byte compat xfrm_userspi_info
as the 232-byte native layout and reads four bytes past the declared
payload. It also publishes the translated child through the request's
frag_list.
A multicast clone of the request shares skb_shared_info and can observe
that child. xfrm_user_rcv_msg() frees it after the request handler
returns, racing a compat receiver which may still be copying from it and
resulting in a use-after-free.
Remove the redundant conversion. The response keeps its correct compat
translation from dump_one_state(), and no child is attached to the
inbound request.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 |
| Linux | Linux | 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 |
| Linux | Linux | 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 |
| Linux | Linux | 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 |
| Linux | Linux | 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 |
| Linux | Linux | 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 |
| Linux | Linux | 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 |
| Linux | Linux | 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 |
| Linux | Linux | 5.10 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
