Medium [CVE-2026-64109] Fix UAF read of tail->len in unix_stream_data_wait
This medium-severity Red Hat Linux advisory covers CVE-2026-64109 affecting Red Hat Enterprise Linux 10, Shadow Migration Toolkit for Virtualization for RHEL 10, Red Hat Enterprise Linux 6.
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Summary
In the Linux kernel, the following vulnerability has been resolved: af_unix: Fix UAF read of tail->len in unix_stream_data_wait() unix_stream_data_wait() does skb_peek_tail(&sk->sk_receive_queue) without holding any lock that prevents SKBs on that queue from being dequeued and freed.
This has been the case since commit 79f632c71bea ("unix/stream: fix peeking with an offset larger than data in queue").
The first consequence of this is that the pointer comparison `tail!= last` can be false even if `last` semantically refers to an already-freed SKB while `tail` is a new SKB allocated at the same address; which can cause unix_stream_data_wait() to wrongly keep blocking after new data has arrived, but only in a weird scenario where a peeking recv() and a normal recv() on the same socket are racing, which is probably not a real problem.
Affected products named by the advisory: Red Hat Enterprise Linux 10; Shadow Migration Toolkit for Virtualization for RHEL 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; and 3 more.
- < 6.5
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
- kernel-0:6.12.0-211.69.1.el10_2
- RHSA-2026:91565
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
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