---
id: CVE-2022-50504
title: 'powerpc/rtas: avoid scheduling in rtas_os_term()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  powerpc/rtas: avoid scheduling in rtas_os_term()

  It's unsafe to use rtas_busy_delay() to handle a busy status from
  the ibm,os-term RTAS function in rtas_os_term():

  Ke…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 507279db1819aacf4022e790b3fc8bc8cf56debf <
    f413135b337c4e90c1e593c6613f8717e17bc724
  - >-
    Linux >= 507279db1819aacf4022e790b3fc8bc8cf56debf <
    4768935b8cc2d2afeb7956292df0f6e2c49ca0a5
  - >-
    Linux >= 507279db1819aacf4022e790b3fc8bc8cf56debf <
    ffa991a003abb4f8cb9e5004646bfe2d9a46912c
  - >-
    Linux >= 507279db1819aacf4022e790b3fc8bc8cf56debf <
    515959eb49e6d218a46979d66f36fdef329ac7d2
  - >-
    Linux >= 507279db1819aacf4022e790b3fc8bc8cf56debf <
    6f7e2fcab73372a371ab4017cbedf7a71f4f9b40
  - >-
    Linux >= 507279db1819aacf4022e790b3fc8bc8cf56debf <
    7280fdb80bf0fe35d9b799fc7009f2cbe0a397d7
  - >-
    Linux >= 507279db1819aacf4022e790b3fc8bc8cf56debf <
    bed48651c87bef59ea1a9d6dbc381bcbc452f4ff
  - >-
    Linux >= 507279db1819aacf4022e790b3fc8bc8cf56debf <
    482d990a5dd1027ee0b70a8a570d56749cac8103
  - >-
    Linux >= 507279db1819aacf4022e790b3fc8bc8cf56debf <
    6c606e57eecc37d6b36d732b1ff7e55b7dc32dd4
  - Linux 2.6.18
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:12:32.770440Z'
published: '2025-10-04'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:20:49.751Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2022-50504'
references:
  - url: 'https://git.kernel.org/stable/c/f413135b337c4e90c1e593c6613f8717e17bc724'
  - url: 'https://git.kernel.org/stable/c/4768935b8cc2d2afeb7956292df0f6e2c49ca0a5'
  - url: 'https://git.kernel.org/stable/c/ffa991a003abb4f8cb9e5004646bfe2d9a46912c'
  - url: 'https://git.kernel.org/stable/c/515959eb49e6d218a46979d66f36fdef329ac7d2'
  - url: 'https://git.kernel.org/stable/c/6f7e2fcab73372a371ab4017cbedf7a71f4f9b40'
  - url: 'https://git.kernel.org/stable/c/7280fdb80bf0fe35d9b799fc7009f2cbe0a397d7'
  - url: 'https://git.kernel.org/stable/c/bed48651c87bef59ea1a9d6dbc381bcbc452f4ff'
  - url: 'https://git.kernel.org/stable/c/482d990a5dd1027ee0b70a8a570d56749cac8103'
  - url: 'https://git.kernel.org/stable/c/6c606e57eecc37d6b36d732b1ff7e55b7dc32dd4'
tags:
  - cve.org
epss: 0.00163
epssPercentile: 0.0556
ingestedAt: '2026-11-05T22:38:31.743Z'
---

## Overview

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

powerpc/rtas: avoid scheduling in rtas_os_term()

It's unsafe to use rtas_busy_delay() to handle a busy status from
the ibm,os-term RTAS function in rtas_os_term():

Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
BUG: sleeping function called from invalid context at arch/powerpc/kernel/rtas.c:618
in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 1, name: swapper/0
preempt_count: 2, expected: 0
CPU: 7 PID: 1 Comm: swapper/0 Tainted: G      D            6.0.0-rc5-02182-gf8553a572277-dirty #9
Call Trace:
[c000000007b8f000] [c000000001337110] dump_stack_lvl+0xb4/0x110 (unreliable)
[c000000007b8f040] [c0000000002440e4] __might_resched+0x394/0x3c0
[c000000007b8f0e0] [c00000000004f680] rtas_busy_delay+0x120/0x1b0
[c000000007b8f100] [c000000000052d04] rtas_os_term+0xb8/0xf4
[c000000007b8f180] [c0000000001150fc] pseries_panic+0x50/0x68
[c000000007b8f1f0] [c000000000036354] ppc_panic_platform_handler+0x34/0x50
[c000000007b8f210] [c0000000002303c4] notifier_call_chain+0xd4/0x1c0
[c000000007b8f2b0] [c0000000002306cc] atomic_notifier_call_chain+0xac/0x1c0
[c000000007b8f2f0] [c0000000001d62b8] panic+0x228/0x4d0
[c000000007b8f390] [c0000000001e573c] do_exit+0x140c/0x1420
[c000000007b8f480] [c0000000001e586c] make_task_dead+0xdc/0x200

Use rtas_busy_delay_time() instead, which signals without side effects
whether to attempt the ibm,os-term RTAS call again.

## Affected

- `Linux >= 507279db1819aacf4022e790b3fc8bc8cf56debf < f413135b337c4e90c1e593c6613f8717e17bc724`
- `Linux >= 507279db1819aacf4022e790b3fc8bc8cf56debf < 4768935b8cc2d2afeb7956292df0f6e2c49ca0a5`
- `Linux >= 507279db1819aacf4022e790b3fc8bc8cf56debf < ffa991a003abb4f8cb9e5004646bfe2d9a46912c`
- `Linux >= 507279db1819aacf4022e790b3fc8bc8cf56debf < 515959eb49e6d218a46979d66f36fdef329ac7d2`
- `Linux >= 507279db1819aacf4022e790b3fc8bc8cf56debf < 6f7e2fcab73372a371ab4017cbedf7a71f4f9b40`
- `Linux >= 507279db1819aacf4022e790b3fc8bc8cf56debf < 7280fdb80bf0fe35d9b799fc7009f2cbe0a397d7`
- `Linux >= 507279db1819aacf4022e790b3fc8bc8cf56debf < bed48651c87bef59ea1a9d6dbc381bcbc452f4ff`
- `Linux >= 507279db1819aacf4022e790b3fc8bc8cf56debf < 482d990a5dd1027ee0b70a8a570d56749cac8103`
- `Linux >= 507279db1819aacf4022e790b3fc8bc8cf56debf < 6c606e57eecc37d6b36d732b1ff7e55b7dc32dd4`
- `Linux 2.6.18`

## Remediation

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