Medium [CVE-2026-64023] fix a potential use-after-free
This medium-severity Red Hat Linux advisory covers CVE-2026-64023.
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Summary
In the Linux kernel, the following vulnerability has been resolved: gpio: aggregator: fix a potential use-after-free On error we free aggr->lookups->dev_id before removing the entry from the lookup table.
If a concurrent thread calls gpiod_find() before we remove the entry, it could iterate over the list and call gpiod_match_lookup_table() which unconditionally dereferences dev_id when calling strcmp(). Reverse the order of cleanup.
A flaw was found in the Linux kernel's GPIO (General Purpose Input/Output) aggregator module. This vulnerability occurs when an error condition causes memory to be prematurely freed while still being referenced in a lookup table.
A local attacker could potentially exploit this timing issue, leading to a use-after-free condition. This could result in a system crash or other unpredictable behavior, impacting system stability.
Red Hat severity: Moderate. Weakness: CWE-825.
Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.
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 7 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 7 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 7 days ago·verify at source
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