Advisory [CVE-2026-64238] fix deadlock on shared proxy's parent removal
This security Red Hat Linux advisory covers CVE-2026-64238 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux for NVIDIA 26, Red Hat OpenShift Container Platform 4.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
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Summary
In the Linux kernel, the following vulnerability has been resolved: gpio: shared: fix deadlock on shared proxy's parent removal Commit 710abda58055 ("gpio: shared: call gpio_chip::of_xlate() if set") used the mutex embedded in struct gpio_shared_entry to protect the offset field which now can be modified after assignment.
The critical section however is too wide and introduced a potential deadlock on the removal of the shared GPIO proxy's parent. Make the critical section shorter - only protect the offset when it's being read.
While at it: mention the fact that the entry lock is now also used to protect against concurrent access to the offset field in the structure's documentation. A too wide critical section, intended to protect the `offset` field in the `struct gpio_shared_entry`, can lead to a potential deadlock.
This occurs during the removal of a shared General Purpose Input/Output (GPIO) proxy's parent. A successful exploit of this vulnerability could result in a denial of service (DoS) due to system unresponsiveness.
Red Hat severity: not rated. Weakness: CWE-833.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux for NVIDIA 26; Red Hat OpenShift Container Platform 4; Red Hat OpenShift Container Platform 5.
Affected products named by the advisory: Red Hat package: libkrun; Red Hat package: kernel.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · medium-confidence parse· fetched 3 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 3 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 3 days ago·verify at source
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