High [CVE-2026-64217] Linux kernel netfs: Memory corruption leading to denial of service and potential privilege escalation
This high-severity Red Hat Linux advisory covers CVE-2026-64217 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 overrun check in netfs_extract_user_iter() Fix netfs_extract_user_iter() so that if iov_iter_extract_pages() overfills pages[], then those pages don't get included in the iterator constructed at the end of the function.
If there was an overfill, memory corruption has already happened. A local user can exploit this vulnerability by performing specific file I/O operations on a netfs-backed mount, leading to an overrun in the `netfs_extract_user_iter()` function.
This memory corruption can cause a kernel crash, resulting in a Denial of Service (DoS). In some cases, it may also lead to privilege escalation by allowing unauthorized access to sensitive kernel memory.
Red Hat severity: Important — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-787.
Affected Red Hat products: Red Hat Enterprise Linux 10. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: 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 11 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 11 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 11 days ago·verify at source
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