Medium [CVE-2026-64464] fix ring sg table pages leak
This medium-severity Red Hat Linux advisory covers CVE-2026-64464 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat package: kernel-rt.
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Summary
In the Linux kernel, the following vulnerability has been resolved: xhci: sideband: fix ring sg table pages leak xhci_ring_to_sgtable() allocates a temporary pages array and uses it to build the returned sg_table with sg_alloc_table_from_pages(). The error paths free the pages array, but the success path returns the sg_table without freeing it.
This leaks the temporary array every time a sideband client gets an endpoint or event ring buffer. The returned sg_table has its own scatterlist entries and does not depend on the temporary array after construction.
A flaw was found in the Linux kernel's xHCI (eXtensible Host Controller Interface) sideband functionality. A memory leak occurs in the `xhci_ring_to_sgtable()` function because a temporary memory array is not properly released after use.
This continuous leakage of memory can lead to system instability and a Denial of Service (DoS) over time, impacting the availability of the system. Red Hat severity: Low — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-772. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: 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 · medium-confidence parse· fetched 27 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 27 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 27 days ago·verify at source
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