CVE-2026-98370: Linux Vulnerability

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3, < 494f2bee9d8d0ebcfa249ac41bed7fed26d119b4; >= 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3, < 17893987e52918c23945c42e47e894a936305a25; >= 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3, < 42971ea17c7a8afc0bdd5ca40648bf4e5bb7b810; >= 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3, < 2b63341e2ebc9b6f73cbd9214dbe7d46dd98c718; >= 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3, < bb63ab52a18273ec68340ac49aebbaa7b514ccd5; >= 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3, < 248433942155b42a0ef04a5806c8aca024ea7c33; >= 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3, < e70f639aee2ff0def155c256cace9e0f81d998e2; >= 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3, < d1ebd9081879fd9ae9c8fb7e8928f19cc88ae320
Linux	Linux	5.10

References

Timeline

Published: Oct 6, 2026
Last Modified: Oct 6, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-98370?

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.

How severe is CVE-2026-98370?

Severity scoring for CVE-2026-98370 is pending analysis.

How do I fix CVE-2026-98370?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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