---
id: CVE-2022-50168
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf, x86: fix freeing of not-finalized bpf_prog_pack

  syzbot reported a few issues with bpf_prog_pack [1], [2]
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf, x86: fix freeing of not-finalized bpf_prog_pack

  syzbot reported a few issues with bpf_prog_pack [1], [2]. This only happens
  with multiple subprogs. In jit_subprog…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 5.18, < 5.18.18'
  - 'linux_kernel >= 5.19, < 5.19.2'
patched:
  - linux_kernel 5.19.2
published: '2025-06-18'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T22:17:27.493'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2022-50168'
references:
  - url: 'https://git.kernel.org/stable/c/1d5f82d9dd477d5c66e0214a68c3e4f308eadd6d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/60e66074812dde9cde3d99cdd3caa9e40f1a4516'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f91ce608a79c0db3e72bd63c23e011a9ebc31505'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00256
epssPercentile: 0.1714
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-15T21:30:21.051809Z'
ingestedAt: '2026-10-15T21:45:11.282Z'
---

## Overview

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

bpf, x86: fix freeing of not-finalized bpf_prog_pack

syzbot reported a few issues with bpf_prog_pack [1], [2]. This only happens
with multiple subprogs. In jit_subprogs(), we first call bpf_int_jit_compile()
on each sub program. And then, we call it on each sub program again. jit_data
is not freed in the first call of bpf_int_jit_compile(). Similarly we don't
call bpf_jit_binary_pack_finalize() in the first call of bpf_int_jit_compile().

If bpf_int_jit_compile() failed for one sub program, we will call
bpf_jit_binary_pack_finalize() for this sub program. However, we don't have a
chance to call it for other sub programs. Then we will hit "goto out_free" in
jit_subprogs(), and call bpf_jit_free on some subprograms that haven't got
bpf_jit_binary_pack_finalize() yet.

At this point, bpf_jit_binary_pack_free() is called and the whole 2MB page is
freed erroneously.

Fix this with a custom bpf_jit_free() for x86_64, which calls
bpf_jit_binary_pack_finalize() if necessary. Also, with custom
bpf_jit_free(), bpf_prog_aux->use_bpf_prog_pack is not needed any more,
remove it.

[1] https://syzkaller.appspot.com/bug?extid=2f649ec6d2eea1495a8f
[2] https://syzkaller.appspot.com/bug?extid=87f65c75f4a72db05445

## Affected

- `linux_kernel >= 5.18, < 5.18.18`
- `linux_kernel >= 5.19, < 5.19.2`

## Remediation

Upgrade past the affected range:

- `linux_kernel 5.19.2`