netfs: Fix write streaming disablement if fd open O_RDWR

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Summary

CVECVE-2026-64158
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:57 UTC
Updated2026-07-19 16:17:57 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfs: Fix write streaming disablement if fd open O_RDWR In netfs_perform_write(), "write streaming" (the caching of dirty data in dirty but !uptodate folios) is performed to avoid the need to read data that is just going to get immediately overwritten. However, this is/will be disabled in three circumstances: if the fd is open O_RDWR, if fscache is in use (as we need to round out the blocks for DIO) or if content encryption is enabled (again for rounding out purposes). The idea behind disabling it if the fd is open O_RDWR is that we'd need to flush the write-streaming page before we could read the data, particularly through mmap. But netfs now fills in the gaps if ->read_folio() is called on the page, so that is unnecessary. Further, this doesn't actually work if a separate fd is open for reading. Fix this by removing the check for O_RDWR, thereby allowing streaming writes even when we might read. This caused a number of problems with the generic/522 xfstest, but those are now fixed.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c38f4e96e605f17990e871214e6ea1496bc4e65f 9adf8e47d73d5e3c2fe77dea649dcde350ccd65c git Not specified
CNA Linux Linux affected c38f4e96e605f17990e871214e6ea1496bc4e65f 616578e40dcba3f94810d841c5a52b7e3bc8ede7 git Not specified
CNA Linux Linux affected c38f4e96e605f17990e871214e6ea1496bc4e65f 7a9fa5b020a3a40f8291a71cd44c08d931da430d git Not specified
CNA Linux Linux affected c38f4e96e605f17990e871214e6ea1496bc4e65f 70a7b9193bbbfceaab5974de66834c64ccc875dd git Not specified
CNA Linux Linux affected 6.8 Not specified
CNA Linux Linux unaffected 6.8 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/9adf8e47d73d5e3c2fe77dea649dcde350ccd65c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/616578e40dcba3f94810d841c5a52b7e3bc8ede7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/70a7b9193bbbfceaab5974de66834c64ccc875dd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7a9fa5b020a3a40f8291a71cd44c08d931da430d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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