What’s Vulnerable › Vulnerabilities

CVE-2022-49611: x86/speculation: Fill RSB on vmexit for IBRS

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-02-26 · updated 2026-06-17

Description

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 products

• Linux kernel: before 4.14.297; from 4.15 before 4.19.266; from 4.20 before 5.4.217; from 5.5 before 5.10.133; from 5.11 before 5.15.57; from 5.16 before 5.18.14 — fixed in 4.14.297, 4.19.266, 5.10.133, 5.15.57, 5.18.14, 5.4.217

How to fix

Upgrade to a fixed version: Linux kernel 4.14.297, 4.19.266, 5.10.133, 5.15.57. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/17a9fc4a7b91f8599223631bb6ae6416bc0de1c0
• https://git.kernel.org/stable/c/3d323b99ff5c8c57005184056d65f6af5b0479d8
• https://git.kernel.org/stable/c/4d7f72b6e1bc630bec7e4cd51814bc2b092bf153
• https://git.kernel.org/stable/c/8c38306e2e9257af4af2819aa287a4711ff36329
• https://git.kernel.org/stable/c/8d5cff499a6d740c91ff37963907e0e983c37f0f
• https://git.kernel.org/stable/c/9756bba28470722dacb79ffce554336dd1f6a6cd
• https://git.kernel.org/stable/c/f744b88dfc201bf8092833ec70b23c720188b527

Get alerted when CVE-2022-49611 or the next vulnerability affects your stack