---
id: CVE-2022-49611
title: 'x86/speculation: Fill RSB on vmexit for IBRS'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  x86/speculation: Fill RSB on vmexit for IBRS

  Prevent RSB underflow/poisoning attacks with RSB.  While at it, add a
  bunch of comments to attempt to document the current…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= b9cdaaf0a3becc52e8b4662fef28c452c4f009b4 <
    3d323b99ff5c8c57005184056d65f6af5b0479d8
  - >-
    Linux >= 117cc7a908c83697b0b737d15ae1eb5943afe35b <
    f744b88dfc201bf8092833ec70b23c720188b527
  - >-
    Linux >= 117cc7a908c83697b0b737d15ae1eb5943afe35b <
    17a9fc4a7b91f8599223631bb6ae6416bc0de1c0
  - >-
    Linux >= 117cc7a908c83697b0b737d15ae1eb5943afe35b <
    4d7f72b6e1bc630bec7e4cd51814bc2b092bf153
  - >-
    Linux >= 117cc7a908c83697b0b737d15ae1eb5943afe35b <
    8d5cff499a6d740c91ff37963907e0e983c37f0f
  - >-
    Linux >= 117cc7a908c83697b0b737d15ae1eb5943afe35b <
    8c38306e2e9257af4af2819aa287a4711ff36329
  - >-
    Linux >= 117cc7a908c83697b0b737d15ae1eb5943afe35b <
    9756bba28470722dacb79ffce554336dd1f6a6cd
  - Linux 68d1f7a3f1a35639a563bbad768d5df885b4ff05
  - Linux 20e080e2752d108388d386ecc0b33d7797dfb18f
  - Linux eebc3f8adee0a6f43a4789ef0bf5c5b35de8cfe4
  - Linux c1ddd99a029636e234a800f28790a60d6ac0318f
  - Linux >= 4.14.14 < 4.14.297
  - Linux >= 3.2.101 < 3.3
  - Linux >= 3.16.56 < 3.17
  - Linux >= 4.4.113 < 4.5
  - Linux >= 4.9.77 < 4.10
  - Linux 4.15
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T19:46:15.314111Z'
published: '2025-02-26'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T19:49:40.677Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2022-49611'
references:
  - url: 'https://git.kernel.org/stable/c/3d323b99ff5c8c57005184056d65f6af5b0479d8'
  - url: 'https://git.kernel.org/stable/c/f744b88dfc201bf8092833ec70b23c720188b527'
  - url: 'https://git.kernel.org/stable/c/17a9fc4a7b91f8599223631bb6ae6416bc0de1c0'
  - url: 'https://git.kernel.org/stable/c/4d7f72b6e1bc630bec7e4cd51814bc2b092bf153'
  - url: 'https://git.kernel.org/stable/c/8d5cff499a6d740c91ff37963907e0e983c37f0f'
  - url: 'https://git.kernel.org/stable/c/8c38306e2e9257af4af2819aa287a4711ff36329'
  - url: 'https://git.kernel.org/stable/c/9756bba28470722dacb79ffce554336dd1f6a6cd'
tags:
  - cve.org
epss: 0.00284
epssPercentile: 0.21093
ingestedAt: '2026-11-05T22:38:31.578Z'
---

## Overview

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

x86/speculation: Fill RSB on vmexit for IBRS

Prevent RSB underflow/poisoning attacks with RSB.  While at it, add a
bunch of comments to attempt to document the current state of tribal
knowledge about RSB attacks and what exactly is being mitigated.

## Affected

- `Linux >= b9cdaaf0a3becc52e8b4662fef28c452c4f009b4 < 3d323b99ff5c8c57005184056d65f6af5b0479d8`
- `Linux >= 117cc7a908c83697b0b737d15ae1eb5943afe35b < f744b88dfc201bf8092833ec70b23c720188b527`
- `Linux >= 117cc7a908c83697b0b737d15ae1eb5943afe35b < 17a9fc4a7b91f8599223631bb6ae6416bc0de1c0`
- `Linux >= 117cc7a908c83697b0b737d15ae1eb5943afe35b < 4d7f72b6e1bc630bec7e4cd51814bc2b092bf153`
- `Linux >= 117cc7a908c83697b0b737d15ae1eb5943afe35b < 8d5cff499a6d740c91ff37963907e0e983c37f0f`
- `Linux >= 117cc7a908c83697b0b737d15ae1eb5943afe35b < 8c38306e2e9257af4af2819aa287a4711ff36329`
- `Linux >= 117cc7a908c83697b0b737d15ae1eb5943afe35b < 9756bba28470722dacb79ffce554336dd1f6a6cd`
- `Linux 68d1f7a3f1a35639a563bbad768d5df885b4ff05`
- `Linux 20e080e2752d108388d386ecc0b33d7797dfb18f`
- `Linux eebc3f8adee0a6f43a4789ef0bf5c5b35de8cfe4`
- `Linux c1ddd99a029636e234a800f28790a60d6ac0318f`
- `Linux >= 4.14.14 < 4.14.297`
- `Linux >= 3.2.101 < 3.3`
- `Linux >= 3.16.56 < 3.17`
- `Linux >= 4.4.113 < 4.5`
- `Linux >= 4.9.77 < 4.10`
- `Linux 4.15`

## Remediation

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