Medium [CVE-2026-64005] Do not re-initialize smc hashtables
This medium-severity Red Hat Linux advisory covers CVE-2026-64005 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.
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Summary
In the Linux kernel, the following vulnerability has been resolved: net/smc: Do not re-initialize smc hashtables INIT_HLIST_HEAD(&smc_v*_hashinfo.ht) are called after smc_nl_init(), proto_register() and sock_register().
This can lead to smc_v*_hashinfo.ht being reset even though hash entries already exist and are being used, possibly resulting in a corrupted list. Remove unnecessary and dangerous re-initialisation of smc_v*_hashinfo.ht in smc_init(); it is implicitly initialised to zero anyhow.
Add HLIST_HEAD_INIT to the definitions for clarity. A flaw was found in the Linux kernel's Server Message Block (SMC) network component.
This vulnerability occurs because the system's internal tables, known as hashtables, are improperly reset after they have already been initialized and are actively in use. This incorrect re-initialization can lead to a corrupted list within the kernel.
Such corruption could potentially cause system instability or other unpredictable behavior. SMC hash list heads could be re initialized after the protocol and socket family were already registered.
If an SMC socket is created during this initialization window, an existing hash entry may be lost or the hlist state may become corrupted.
Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat package: kernel-rt.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-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 · high-confidence parse· fetched 7 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 7 days ago·verify at source
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