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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64059
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:46 UTC
Updated2026-07-19 16:17:46 UTC
DescriptionIn 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".

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.063840000 (date 2026-07-20)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8f52de0077ba3bf41e5d53d67a185700f41efce7 7f040243c74d72b45b22246c7d9e621fbeab44ac git Not specified
CNA Linux Linux affected 8f52de0077ba3bf41e5d53d67a185700f41efce7 551b5c71ee312ca7646ddb605231c1016e8cbb18 git Not specified
CNA Linux Linux affected 8f52de0077ba3bf41e5d53d67a185700f41efce7 0969ea8370bad0e4fb6131b6a7bed9e7ec522ac7 git Not specified
CNA Linux Linux affected 8f52de0077ba3bf41e5d53d67a185700f41efce7 ccde2ac757c713535b224233a296de40efe5212d git Not specified
CNA Linux Linux affected 6.12 Not specified
CNA Linux Linux unaffected 6.12 semver Not specified
CNA Linux Linux unaffected 6.12.92 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0969ea8370bad0e4fb6131b6a7bed9e7ec522ac7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/551b5c71ee312ca7646ddb605231c1016e8cbb18 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ccde2ac757c713535b224233a296de40efe5212d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7f040243c74d72b45b22246c7d9e621fbeab44ac 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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