---
id: CVE-2026-98370
title: |-
  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 r…
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 r…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 <
    494f2bee9d8d0ebcfa249ac41bed7fed26d119b4
  - >-
    Linux >= 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 <
    17893987e52918c23945c42e47e894a936305a25
  - >-
    Linux >= 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 <
    42971ea17c7a8afc0bdd5ca40648bf4e5bb7b810
  - >-
    Linux >= 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 <
    2b63341e2ebc9b6f73cbd9214dbe7d46dd98c718
  - >-
    Linux >= 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 <
    bb63ab52a18273ec68340ac49aebbaa7b514ccd5
  - >-
    Linux >= 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 <
    248433942155b42a0ef04a5806c8aca024ea7c33
  - >-
    Linux >= 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 <
    e70f639aee2ff0def155c256cace9e0f81d998e2
  - >-
    Linux >= 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 <
    d1ebd9081879fd9ae9c8fb7e8928f19cc88ae320
  - Linux 5.10
published: '2026-10-06'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T09:18:31.450'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98370'
references:
  - url: 'https://git.kernel.org/stable/c/17893987e52918c23945c42e47e894a936305a25'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/248433942155b42a0ef04a5806c8aca024ea7c33'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2b63341e2ebc9b6f73cbd9214dbe7d46dd98c718'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/42971ea17c7a8afc0bdd5ca40648bf4e5bb7b810'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/494f2bee9d8d0ebcfa249ac41bed7fed26d119b4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bb63ab52a18273ec68340ac49aebbaa7b514ccd5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d1ebd9081879fd9ae9c8fb7e8928f19cc88ae320'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e70f639aee2ff0def155c256cace9e0f81d998e2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-06T08:50:17.389Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.