PT-2026-61641 · Linux · Linux Kernel

CVE-2026-64188 · Published 2026-07-20 · Updated 2026-07-20

Positive Technologies (AI Summary)

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A use-after-free issue exists in the rmnet dellink() function. The function removes an endpoint from the hash table and frees it immediately using kfree(). However, RCU readers on the receive path, specifically within rmnet rx handler and rmnet map ingress handler, may still hold a reference to the endpoint and attempt to dereference the egress dev variable after the memory has been released. RCU (Read-Copy-Update) is a synchronization mechanism that allows multiple readers to access data while it is being updated.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Related Identifiers

CVE-2026-64188

Affected Products

Linux Kernel

References · 10

• https://nvd.nist.gov/vuln/detail/CVE-2026-64188 · Security Note
• https://twitter.com/vuldb/status/2079287658921300370 · Twitter Post
• https://git.kernel.org/stable/c/d00c953a8f69921f484b629801766da68f27f658 · Note
• https://git.kernel.org/stable/c/f193e38cb257d033060b63f1cfd94af076b3a2ab · Note
• https://git.kernel.org/stable/c/9918698cf3aee4032e12bb42fd5a951dc465339b · Note
• https://git.kernel.org/stable/c/41e06fcc5df0774d212e70c5b503fc769492bce3 · Note
• https://git.kernel.org/stable/c/8b17adf6d4fb6bf61fa4c3f58366a7c082799a71 · Note
• https://git.kernel.org/stable/c/310b93246bfec7d4452507e0c15477377ed9f025 · Note
• https://git.kernel.org/stable/c/c4e676c3505c5058922dc1a6f1ded795f6758135 · Note
• https://git.kernel.org/stable/c/1078ae8175777e80c9637996fb4a46c55f0ce576 · Note