---
id: CVE-2026-98775
title: 'nitro_enclaves: fix use-after-free on SLOT_ALLOC failure'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nitro_enclaves: fix use-after-free on SLOT_ALLOC failure

  When ne_create_vm_ioctl() fails the SLOT_ALLOC request after
  anon_inode_getfile() has succeeded, the error pat…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 9c8eb50fe9e2bb8a2e725979e052fbf592b6b799 <
    466041d14f26dc2babd606a2e85dce08774112a6
  - >-
    Linux >= 9c8eb50fe9e2bb8a2e725979e052fbf592b6b799 <
    f7fb6c2835ede1b8ad84cf7e78a528a9d0159b84
  - >-
    Linux >= 9c8eb50fe9e2bb8a2e725979e052fbf592b6b799 <
    43f78b328f3907ca2f7424e15b7e45ffbf9fe21c
  - >-
    Linux >= 9c8eb50fe9e2bb8a2e725979e052fbf592b6b799 <
    9bc184a2eda8b773c88ecbff934001ad649b9cc1
  - Linux 5.10
published: '2026-10-18'
updated: '2026-10-18'
sourceUpdated: '2026-10-18T15:48:11.317Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98775'
references:
  - url: 'https://git.kernel.org/stable/c/466041d14f26dc2babd606a2e85dce08774112a6'
  - url: 'https://git.kernel.org/stable/c/f7fb6c2835ede1b8ad84cf7e78a528a9d0159b84'
  - url: 'https://git.kernel.org/stable/c/43f78b328f3907ca2f7424e15b7e45ffbf9fe21c'
  - url: 'https://git.kernel.org/stable/c/9bc184a2eda8b773c88ecbff934001ad649b9cc1'
tags:
  - cve.org
ingestedAt: '2026-10-18T16:47:32.491Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

nitro_enclaves: fix use-after-free on SLOT_ALLOC failure

When ne_create_vm_ioctl() fails the SLOT_ALLOC request after
anon_inode_getfile() has succeeded, the error path calls
fput(enclave_file) and then frees ne_enclave.

In normal userspace context, fput() defers the final __fput() via
task_work. ne_enclave_release() therefore runs after ne_enclave has
already been freed and dereferences ne_enclave->slot_uid, causing a
use-after-free: KASAN: slab-use-after-free in ne_enclave_release.

The enclave has no slot allocated and is not yet linked into the
enclaves list on this error path, so ne_enclave_release() is expected
to return early when slot_uid is zero. However, reading slot_uid
already accesses the freed object.

Clear enclave_file->private_data before fput() on the error path.
ne_enclave_release() then returns immediately when private_data is
NULL, leaving the ioctl error path as the sole owner of ne_enclave.
This is safe because the file has not been fd_install()'d yet.

Tested on an AWS EC2 m5.2xlarge with CONFIG_KASAN=y. Without the
patch, the reproducer triggers a KASAN slab-use-after-free on every
SLOT_ALLOC failure. With the patch, no KASAN report is produced and
the SLOT_ALLOC error is still returned. Normal enclave creation and
teardown are unaffected.

## Affected

- `Linux >= 9c8eb50fe9e2bb8a2e725979e052fbf592b6b799 < 466041d14f26dc2babd606a2e85dce08774112a6`
- `Linux >= 9c8eb50fe9e2bb8a2e725979e052fbf592b6b799 < f7fb6c2835ede1b8ad84cf7e78a528a9d0159b84`
- `Linux >= 9c8eb50fe9e2bb8a2e725979e052fbf592b6b799 < 43f78b328f3907ca2f7424e15b7e45ffbf9fe21c`
- `Linux >= 9c8eb50fe9e2bb8a2e725979e052fbf592b6b799 < 9bc184a2eda8b773c88ecbff934001ad649b9cc1`
- `Linux 5.10`

## Remediation

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