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.
A flaw in the Linux kernel netfs helper code, rated with an impact of IMPORTANT, affects Red Hat Enterprise Linux 10 and Red Hat In-Vehicle OS 2. The vulnerable code was introduced upstream in Linux kernel 6.3, so Red Hat Enterprise Linux 6, 7, 8, and 9 do not contain the vulnerable code and are not affected.
Red Hat scored this flaw 7.0 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H), lower than the 7.8 score in the upstream CVE record (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H), because Red Hat assessed that successfully triggering the memory corruption involves high attack complexity.
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 hours 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 hours ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not 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 hours ago·verify at source
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