{"id":"CVE-2026-89642","state":"PUBLISHED","title":"cifs: call pagecache_isize_extended() in cifs_setsize() when extending","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: call pagecache_isize_extended() in cifs_setsize() when extending\n\ncifs_setsize() calls truncate_pagecache() but skips\npagecache_isize_extended() on extension.  truncate_setsize() shows\nthe correct pattern:\n\n  i_size_write(inode, newsize);\n  if (newsize > oldsize)\n      pagecache_isize_extended(inode, oldsize, newsize);\n  truncate_pagecache(inode, newsize);\n\npagecache_isize_extended() zeroes the tail of the page straddling old\nEOF.  Without it, dirty bytes in that region can be written back to\nthe server, exposing stale data in the newly extended range.","publishedAt":"2026-09-11T19:45:34.778Z","updatedAt":"2026-10-30T12:32:25.947Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"880e1b5883a5d78d916fa446791c48f28a16719b","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"5463d96cd2e46064ceefcf861b028745a4f4c373","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"40c16040783abcc240bd1b453e679ea6ca30e19e","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"e1f692b6da3e632a25d0b3a99f833bb609bae1a3","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"12bafe32f09c0d24f5096154b59c347b9c6606e0","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"c510edb9734af1c274d18f4f31a471a166bbc7e8","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/inode.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","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/inode.c"]}],"references":["https://git.kernel.org/stable/c/880e1b5883a5d78d916fa446791c48f28a16719b","https://git.kernel.org/stable/c/5463d96cd2e46064ceefcf861b028745a4f4c373","https://git.kernel.org/stable/c/40c16040783abcc240bd1b453e679ea6ca30e19e","https://git.kernel.org/stable/c/e1f692b6da3e632a25d0b3a99f833bb609bae1a3","https://git.kernel.org/stable/c/12bafe32f09c0d24f5096154b59c347b9c6606e0","https://git.kernel.org/stable/c/c510edb9734af1c274d18f4f31a471a166bbc7e8"],"weaknesses":[],"ingestedAt":"2026-10-30T12:50:04.827Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89642.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89642","state":"PUBLISHED","datePublished":"2026-09-11T19:45:34.778Z","dateUpdated":"2026-10-30T12:32:25.947Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.741Z"},"containers":{"cna":{"title":"cifs: call pagecache_isize_extended() in cifs_setsize() when extending","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: call pagecache_isize_extended() in cifs_setsize() when extending\n\ncifs_setsize() calls truncate_pagecache() but skips\npagecache_isize_extended() on extension.  truncate_setsize() shows\nthe correct pattern:\n\n  i_size_write(inode, newsize);\n  if (newsize > oldsize)\n      pagecache_isize_extended(inode, oldsize, newsize);\n  truncate_pagecache(inode, newsize);\n\npagecache_isize_extended() zeroes the tail of the page straddling old\nEOF.  Without it, dirty bytes in that region can be written back to\nthe server, exposing stale data in the newly extended range."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"880e1b5883a5d78d916fa446791c48f28a16719b","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"5463d96cd2e46064ceefcf861b028745a4f4c373","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"40c16040783abcc240bd1b453e679ea6ca30e19e","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"e1f692b6da3e632a25d0b3a99f833bb609bae1a3","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"12bafe32f09c0d24f5096154b59c347b9c6606e0","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"c510edb9734af1c274d18f4f31a471a166bbc7e8","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/inode.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","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/inode.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/880e1b5883a5d78d916fa446791c48f28a16719b"},{"url":"https://git.kernel.org/stable/c/5463d96cd2e46064ceefcf861b028745a4f4c373"},{"url":"https://git.kernel.org/stable/c/40c16040783abcc240bd1b453e679ea6ca30e19e"},{"url":"https://git.kernel.org/stable/c/e1f692b6da3e632a25d0b3a99f833bb609bae1a3"},{"url":"https://git.kernel.org/stable/c/12bafe32f09c0d24f5096154b59c347b9c6606e0"},{"url":"https://git.kernel.org/stable/c/c510edb9734af1c274d18f4f31a471a166bbc7e8"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:32:25.947Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.18.57"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"7.2.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}