{"id":"CVE-2026-99137","state":"PUBLISHED","title":"cifs: don't update i_size in cifs_do_truncate without a cached handle","description":"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, 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.","publishedAt":"2026-10-28T10:34:49.266Z","updatedAt":"2026-10-28T10:34:49.266Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"110fee6b9bb58a5c50047fc2594d415f741b591e","status":"affected","lessThan":"04d020b3d0b58a1b7e116900e4095b96a7f4e11a","versionType":"git"},{"version":"110fee6b9bb58a5c50047fc2594d415f741b591e","status":"affected","lessThan":"88a51743cd8094b76fd910f53f718747c7729cc8","versionType":"git"},{"version":"110fee6b9bb58a5c50047fc2594d415f741b591e","status":"affected","lessThan":"fe39cd9d48f2346605f3746e0cc19e89d5f373eb","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/file.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.59","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.13","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/file.c"]}],"references":["https://git.kernel.org/stable/c/04d020b3d0b58a1b7e116900e4095b96a7f4e11a","https://git.kernel.org/stable/c/88a51743cd8094b76fd910f53f718747c7729cc8","https://git.kernel.org/stable/c/fe39cd9d48f2346605f3746e0cc19e89d5f373eb"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/99xxx/CVE-2026-99137.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-99137","state":"PUBLISHED","datePublished":"2026-10-28T10:34:49.266Z","dateUpdated":"2026-10-28T10:34:49.266Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.395Z"},"containers":{"cna":{"title":"cifs: don't update i_size in cifs_do_truncate without a cached handle","descriptions":[{"lang":"en","value":"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, 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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"110fee6b9bb58a5c50047fc2594d415f741b591e","status":"affected","lessThan":"04d020b3d0b58a1b7e116900e4095b96a7f4e11a","versionType":"git"},{"version":"110fee6b9bb58a5c50047fc2594d415f741b591e","status":"affected","lessThan":"88a51743cd8094b76fd910f53f718747c7729cc8","versionType":"git"},{"version":"110fee6b9bb58a5c50047fc2594d415f741b591e","status":"affected","lessThan":"fe39cd9d48f2346605f3746e0cc19e89d5f373eb","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/file.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.59","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.13","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/file.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-28T10:34:49.266Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"6.18.59"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.2.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}