{"id":"CVE-2026-99137","title":"cifs: don't update i_size in cifs_do_truncate without a cached handle","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: don't update i_size in cifs_do_truncate without a cached handle\n\nIf find_writable_file() returns null, cifs_file_flush will return\n0 without issuing set_file_size…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 110fee6b9bb58a5c50047fc2594d415f741b591e < 04d020b3d0b58a1b7e116900e4095b96a7f4e11a","Linux >= 110fee6b9bb58a5c50047fc2594d415f741b591e < 88a51743cd8094b76fd910f53f718747c7729cc8","Linux >= 110fee6b9bb58a5c50047fc2594d415f741b591e < fe39cd9d48f2346605f3746e0cc19e89d5f373eb","Linux 6.18"],"published":"2026-10-28","updated":"2026-10-28","sourceUpdated":"2026-10-28T10:34:49.266Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99137","references":[{"url":"https://git.kernel.org/stable/c/04d020b3d0b58a1b7e116900e4095b96a7f4e11a"},{"url":"https://git.kernel.org/stable/c/88a51743cd8094b76fd910f53f718747c7729cc8"},{"url":"https://git.kernel.org/stable/c/fe39cd9d48f2346605f3746e0cc19e89d5f373eb"}],"tags":["cve.org"],"ingestedAt":"2026-10-28T11:09:40.433Z","slug":"CVE-2026-99137","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ncifs: don't update i_size in cifs_do_truncate without a cached handle\n\nIf find_writable_file() returns null, cifs_file_flush will return\n0 without issuing set_file_size, and the outer 'if (!rc)' block\nwill set i_size to 0 before telling the server to truncate.  If\nthe cifs_open() then fails, the inode will have size 0, while\nthe server file is unchanged.\n\nMove the netfs_resize_file() and cifs_setsize() into the 'if\n(cfile)', so they only run after a successful set_file_size.\n\nIn the no-handle else branch, evict stale pages with\ntruncate_inode_pages before the O_TRUNC open to dispose of old\ncache pages, and let the open response set the i_size.\n\n## Affected\n\n- `Linux >= 110fee6b9bb58a5c50047fc2594d415f741b591e < 04d020b3d0b58a1b7e116900e4095b96a7f4e11a`\n- `Linux >= 110fee6b9bb58a5c50047fc2594d415f741b591e < 88a51743cd8094b76fd910f53f718747c7729cc8`\n- `Linux >= 110fee6b9bb58a5c50047fc2594d415f741b591e < fe39cd9d48f2346605f3746e0cc19e89d5f373eb`\n- `Linux 6.18`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}