cifs: don't update i_size in cifs_do_truncate without a cached handle

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-99137
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-28 11:17:33 UTC
Updated2026-10-28 11:17:33 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: cifs: don't update i_size in cifs_do_truncate without a cached handle If find_writable_file() returns null, cifs_file_flush will return 0 without issuing set_file_size, and the outer 'if (!rc)' block will set i_size to 0 before telling the server to truncate. If the cifs_open() then fails, the inode will have size 0, while the server file is unchanged. Move the netfs_resize_file() and cifs_setsize() into the 'if (cfile)', so they only run after a successful set_file_size. In the no-handle else branch, evict stale pages with truncate_inode_pages before the O_TRUNC open to dispose of old cache pages, and let the open response set the i_size.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 110fee6b9bb58a5c50047fc2594d415f741b591e 04d020b3d0b58a1b7e116900e4095b96a7f4e11a git Not specified
CNA Linux Linux affected 110fee6b9bb58a5c50047fc2594d415f741b591e 88a51743cd8094b76fd910f53f718747c7729cc8 git Not specified
CNA Linux Linux affected 110fee6b9bb58a5c50047fc2594d415f741b591e fe39cd9d48f2346605f3746e0cc19e89d5f373eb git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.59 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.13 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/88a51743cd8094b76fd910f53f718747c7729cc8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/04d020b3d0b58a1b7e116900e4095b96a7f4e11a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fe39cd9d48f2346605f3746e0cc19e89d5f373eb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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