CVE-2026-64059— Linux kernel 安全漏洞

netfs: Fix folio->private handling in netfs_perform_write()

In the Linux kernel, the following vulnerability has been resolved: netfs: Fix folio->private handling in netfs_perform_write() Under some circumstances, netfs_perform_write() doesn't correctly manipulate folio->private between NULL, NETFS_FOLIO_COPY_TO_CACHE, pointing to a group and pointing to a netfs_folio struct, leading to potential multiple attachments of private data with associated folio ref leaks and also leaks of netfs_folio structs or netfs_group refs. Fix this by consolidating the place at which a folio is marked uptodate in one place and having that look at what's attached to folio->private and decide how to clean it up and then set the new group. Also, the content shouldn't be flushed if group is NULL, even if a group is specified in the netfs_group parameter, as that would be the case for a new folio. A filesystem should always specify netfs_group or never specify netfs_group. The Sashiko auto-review tool noted that it was theoretically possible that the fpos >= ctx->zero_point section might leak if it modified a streaming write folio. This is unlikely, but with a network filesystem, third party changes can happen. It also pointed out that __netfs_set_group() would leak if called multiple times on the same folio from the "whole folio modify section".

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Linux kernel 安全漏洞

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 6.12版本存在安全漏洞，该漏洞源于netfs组件中的folio->private处理不当，可能导致私有数据多次附加并引发folio ref泄露以及netfs_folio struct或netfs_group ref泄露。

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