What’s Vulnerable › Vulnerabilities

CVE-2026-98855: of/overlay: put property on deadprops only after changeset add succeeds

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-18 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: of/overlay: put property on deadprops only after changeset add succeeds add_changeset_property() links a new property of a not-yet-live target node into the node's deadprops list before handing it to of_changeset_add_property(). If that fails, the error path frees the property but leaves the freed pointer linked in deadprops, and of_node_release() frees it a second time when the aborted overlay's node is released. Record the changeset entry first and link the property into deadprops only on success. of_changeset_add_property() never looks at the node's property lists, so the order of the two steps is otherwise immaterial, and the error path frees a property that nothing references.

Affected products

• Linux: from 4.19.49 before 4.20 — fixed in 4.20

How to fix

Upgrade to a fixed version: Linux 4.20. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/004a0ee2e5315f1245775b369fcb940e8cda3807
• https://git.kernel.org/stable/c/50c3663790c61648a51f197970f660fd543269a7
• https://git.kernel.org/stable/c/5857035a3b53a4e7b5a0d5a740189901ece0b079
• https://git.kernel.org/stable/c/7dc6a769153c0457077a0da4888a00f61e66de15
• https://git.kernel.org/stable/c/814f2da6995772c07a7c9c2cc6028b6e3f3ecc9c
• https://git.kernel.org/stable/c/936f1ffcb87a1c50938a21176a6463af162cf4b5
• https://git.kernel.org/stable/c/d5151496a0a2b19c9c0c7b0ebf86b3de55a8fa3a
• https://git.kernel.org/stable/c/f6f70b12ae3e4074e4cd3f42cd66fd482ce7a4b5

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