{"id":"CVE-2026-68312","state":"PUBLISHED","title":"cifs: fix cifsFileInfo leak on kmalloc failure in deferred close drain paths","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: fix cifsFileInfo leak on kmalloc failure in deferred close drain paths\n\nIn cifs_close_deferred_file(), cifs_close_all_deferred_files(), and\ncifs_close_deferred_file_under_dentry(), when a pending deferred close\nis cancelled via cancel_delayed_work(), the subsequent kmalloc_obj() to\nadd the file to the local processing list may fail under memory pressure.\nThe loop breaks immediately, but the cancelled work is no longer pending\n(it would have called _cifsFileInfo_put()), and the cfile is never added\nto file_head for processing.  The cifsFileInfo reference and the open\nserver handle both leak.\n\nFix by saving the cfile that failed allocation in a local variable,\nbreaking as before, and calling _cifsFileInfo_put() on it after\nreleasing the lock.  Any files later in the iteration are unaffected\nsince their deferred work is still pending and will fire normally.","publishedAt":"2026-08-10T12:02:46.907Z","updatedAt":"2026-10-30T12:28:22.322Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e3fc065682ebbbd15b0ce0036800f4acbf765d46","status":"affected","lessThan":"75143abc21f627da7ee3b0336814bd702692e830","versionType":"git"},{"version":"e3fc065682ebbbd15b0ce0036800f4acbf765d46","status":"affected","lessThan":"c968b2417f6a15d35ff4b97d534af4a126cb510b","versionType":"git"},{"version":"e3fc065682ebbbd15b0ce0036800f4acbf765d46","status":"affected","lessThan":"7af7ec3af091f55d01f0ebe0246d10e37f358311","versionType":"git"},{"version":"e3fc065682ebbbd15b0ce0036800f4acbf765d46","status":"affected","lessThan":"6089f561e2c31a3ba52836c75c7d2ab50d2eea41","versionType":"git"},{"version":"e3fc065682ebbbd15b0ce0036800f4acbf765d46","status":"affected","lessThan":"32390b3f06f26e366cfb27dbac4bc0196c321535","versionType":"git"},{"version":"e3fc065682ebbbd15b0ce0036800f4acbf765d46","status":"affected","lessThan":"c2f2e83e3bbc5483730fd4ee903182761f1ae50f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/misc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","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":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","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/misc.c"]}],"references":["https://git.kernel.org/stable/c/75143abc21f627da7ee3b0336814bd702692e830","https://git.kernel.org/stable/c/c968b2417f6a15d35ff4b97d534af4a126cb510b","https://git.kernel.org/stable/c/7af7ec3af091f55d01f0ebe0246d10e37f358311","https://git.kernel.org/stable/c/6089f561e2c31a3ba52836c75c7d2ab50d2eea41","https://git.kernel.org/stable/c/32390b3f06f26e366cfb27dbac4bc0196c321535","https://git.kernel.org/stable/c/c2f2e83e3bbc5483730fd4ee903182761f1ae50f"],"weaknesses":[],"ingestedAt":"2026-10-30T12:46:06.359Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/68xxx/CVE-2026-68312.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-68312","state":"PUBLISHED","datePublished":"2026-08-10T12:02:46.907Z","dateUpdated":"2026-10-30T12:28:22.322Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-30T09:28:09.381Z"},"containers":{"cna":{"title":"cifs: fix cifsFileInfo leak on kmalloc failure in deferred close drain paths","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: fix cifsFileInfo leak on kmalloc failure in deferred close drain paths\n\nIn cifs_close_deferred_file(), cifs_close_all_deferred_files(), and\ncifs_close_deferred_file_under_dentry(), when a pending deferred close\nis cancelled via cancel_delayed_work(), the subsequent kmalloc_obj() to\nadd the file to the local processing list may fail under memory pressure.\nThe loop breaks immediately, but the cancelled work is no longer pending\n(it would have called _cifsFileInfo_put()), and the cfile is never added\nto file_head for processing.  The cifsFileInfo reference and the open\nserver handle both leak.\n\nFix by saving the cfile that failed allocation in a local variable,\nbreaking as before, and calling _cifsFileInfo_put() on it after\nreleasing the lock.  Any files later in the iteration are unaffected\nsince their deferred work is still pending and will fire normally."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e3fc065682ebbbd15b0ce0036800f4acbf765d46","status":"affected","lessThan":"75143abc21f627da7ee3b0336814bd702692e830","versionType":"git"},{"version":"e3fc065682ebbbd15b0ce0036800f4acbf765d46","status":"affected","lessThan":"c968b2417f6a15d35ff4b97d534af4a126cb510b","versionType":"git"},{"version":"e3fc065682ebbbd15b0ce0036800f4acbf765d46","status":"affected","lessThan":"7af7ec3af091f55d01f0ebe0246d10e37f358311","versionType":"git"},{"version":"e3fc065682ebbbd15b0ce0036800f4acbf765d46","status":"affected","lessThan":"6089f561e2c31a3ba52836c75c7d2ab50d2eea41","versionType":"git"},{"version":"e3fc065682ebbbd15b0ce0036800f4acbf765d46","status":"affected","lessThan":"32390b3f06f26e366cfb27dbac4bc0196c321535","versionType":"git"},{"version":"e3fc065682ebbbd15b0ce0036800f4acbf765d46","status":"affected","lessThan":"c2f2e83e3bbc5483730fd4ee903182761f1ae50f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/misc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","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":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","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/misc.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/75143abc21f627da7ee3b0336814bd702692e830"},{"url":"https://git.kernel.org/stable/c/c968b2417f6a15d35ff4b97d534af4a126cb510b"},{"url":"https://git.kernel.org/stable/c/7af7ec3af091f55d01f0ebe0246d10e37f358311"},{"url":"https://git.kernel.org/stable/c/6089f561e2c31a3ba52836c75c7d2ab50d2eea41"},{"url":"https://git.kernel.org/stable/c/32390b3f06f26e366cfb27dbac4bc0196c321535"},{"url":"https://git.kernel.org/stable/c/c2f2e83e3bbc5483730fd4ee903182761f1ae50f"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:28:22.322Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.18.57"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.1.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}