What’s Vulnerable › Vulnerabilities

CVE-2022-49190: kernel/resource: fix kfree() of bootmem memory again

• 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
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: kernel/resource: fix kfree() of bootmem memory again Since commit ebff7d8f270d ("mem hotunplug: fix kfree() of bootmem memory"), we could get a resource allocated during boot via alloc_resource(). And it's required to release the resource using free_resource(). Howerver, many people use kfree directly which will result in kernel BUG. In order to fix this without fixing every call site, just leak a couple of bytes in such corner case.

Affected products

• Linux kernel: from 3.10 before 5.15.33; from 5.16 before 5.16.19; from 5.17 before 5.17.2 — fixed in 5.15.33, 5.16.19, 5.17.2

How to fix

Upgrade to a fixed version: Linux kernel 5.15.33, 5.16.19, 5.17.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0cbcc92917c5de80f15c24d033566539ad696892
• https://git.kernel.org/stable/c/3379a60f6bb4afcd9c456e340ac525ae649d3ce7
• https://git.kernel.org/stable/c/a9e88c2618d228d7a4e7e515cf30dc0d0d813f27
• https://git.kernel.org/stable/c/ab86020070999e758ce2e60c4348f20bf7ddba56
• https://git.kernel.org/stable/c/d7faa04a44a0c37ac3d222fa8e0bdcbfcee9c0c8
• https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html

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