High [CVE-2026-64216] netfs Use-After-Free vulnerability allows local denial of service and memory corruption
This high-severity Red Hat Linux advisory covers CVE-2026-64216 affecting Red Hat Enterprise Linux 10, Red Hat package: kernel.
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Summary
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix potential UAF in netfs_unlock_abandoned_read_pages() netfs_unlock_abandoned_read_pages(rreq) accesses the index of the folios it is wanting to unlock and compares that to rreq->no_unlock_folio so that it doesn't unlock a folio being read for netfs_perform_write() or netfs_write_begin().
However, given that netfs_unlock_abandoned_read_pages() is called _after_ NETFS_RREQ_IN_PROGRESS is cleared, the one folio that it's not allowed to dereference is the one specified by ->no_unlock_folio as ownership immediately reverts to the caller. Fix this by storing the folio pointer instead and using that rather than the index.
Also fix netfs_unlock_read_folio() where the same applies. A local user, by interacting with a mounted `netfs` filesystem, could trigger a Use-After-Free (UAF) vulnerability.
This flaw occurs when the system attempts to unlock abandoned read pages, potentially leading to a kernel crash and a denial of service. In some cases, this could also result in memory corruption, allowing for information disclosure or data manipulation.
This vulnerability is rated with a Moderate severity because exploitation requires local access and relies on triggering race conditions during concurrent I/O operations on filesystems utilizing netfs.
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 1 day 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 1 day 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 1 day ago·verify at source
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