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CVE-2026-98370

xfrm: fix compat ALLOCSPI request use-after-free

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 · fixed in 494f2bee9d8d0ebcfa249ac41bed7fed26d119b4; From 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 · fixed in 17893987e52918c23945c42e47e894a936305a25; From 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 · fixed in 42971ea17c7a8afc0bdd5ca40648bf4e5bb7b810; From 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 · fixed in 2b63341e2ebc9b6f73cbd9214dbe7d46dd98c718; From 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 · fixed in bb63ab52a18273ec68340ac49aebbaa7b514ccd5; From 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 · fixed in 248433942155b42a0ef04a5806c8aca024ea7c33; From 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 · fixed in e70f639aee2ff0def155c256cace9e0f81d998e2; From 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 · fixed in d1ebd9081879fd9ae9c8fb7e8928f19cc88ae320

  • Linux Linux

    5.10

  • KernelLinux

    From 5.10.0 · fixed in 5.10.271; From 5.11.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.112; From 6.13.0 · fixed in 6.18.54; From 6.19.0 · fixed in 7.2.8

References 8

git.kernel.org