{"id":"CVE-2025-40103","state":"PUBLISHED","title":"smb: client: Fix refcount leak for cifs_sb_tlink","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: Fix refcount leak for cifs_sb_tlink\n\nFix three refcount inconsistency issues related to `cifs_sb_tlink`.\n\nComments for `cifs_sb_tlink` state that `cifs_put_tlink()` needs to be\ncalled after successful calls to `cifs_sb_tlink()`. Three calls fail to\nupdate refcount accordingly, leading to possible resource leaks.","publishedAt":"2025-10-30T09:48:08.421Z","updatedAt":"2026-05-11T21:42:34.498Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8ceb984379462f94bdebef3288d569c6e1f912ea","status":"affected","lessThan":"d3c8ea197055c260119a13360e8202a27e53e1e4","versionType":"git"},{"version":"8ceb984379462f94bdebef3288d569c6e1f912ea","status":"affected","lessThan":"790282abe9d805f08618c1c24ea2529e7259b692","versionType":"git"},{"version":"8ceb984379462f94bdebef3288d569c6e1f912ea","status":"affected","lessThan":"d7dd034c14928306db1b46be277ae439b84dacf9","versionType":"git"},{"version":"8ceb984379462f94bdebef3288d569c6e1f912ea","status":"affected","lessThan":"e15605b68b490186da2ad8029c0351a9cfb0b9af","versionType":"git"},{"version":"8ceb984379462f94bdebef3288d569c6e1f912ea","status":"affected","lessThan":"896bb31e1416f582503db1350cf1bd10dc64e5a6","versionType":"git"},{"version":"8ceb984379462f94bdebef3288d569c6e1f912ea","status":"affected","lessThan":"c2b77f42205ef485a647f62082c442c1cd69d3fc","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/inode.c","fs/smb/client/smb2ops.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.7","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.158","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.114","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.55","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.5","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","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","fs/smb/client/smb2ops.c"]}],"references":["https://git.kernel.org/stable/c/d3c8ea197055c260119a13360e8202a27e53e1e4","https://git.kernel.org/stable/c/790282abe9d805f08618c1c24ea2529e7259b692","https://git.kernel.org/stable/c/d7dd034c14928306db1b46be277ae439b84dacf9","https://git.kernel.org/stable/c/e15605b68b490186da2ad8029c0351a9cfb0b9af","https://git.kernel.org/stable/c/896bb31e1416f582503db1350cf1bd10dc64e5a6","https://git.kernel.org/stable/c/c2b77f42205ef485a647f62082c442c1cd69d3fc"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:09.358Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/40xxx/CVE-2025-40103.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-40103","state":"PUBLISHED","datePublished":"2025-10-30T09:48:08.421Z","dateUpdated":"2026-05-11T21:42:34.498Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T07:20:57.164Z"},"containers":{"cna":{"title":"smb: client: Fix refcount leak for cifs_sb_tlink","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: Fix refcount leak for cifs_sb_tlink\n\nFix three refcount inconsistency issues related to `cifs_sb_tlink`.\n\nComments for `cifs_sb_tlink` state that `cifs_put_tlink()` needs to be\ncalled after successful calls to `cifs_sb_tlink()`. Three calls fail to\nupdate refcount accordingly, leading to possible resource leaks."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8ceb984379462f94bdebef3288d569c6e1f912ea","status":"affected","lessThan":"d3c8ea197055c260119a13360e8202a27e53e1e4","versionType":"git"},{"version":"8ceb984379462f94bdebef3288d569c6e1f912ea","status":"affected","lessThan":"790282abe9d805f08618c1c24ea2529e7259b692","versionType":"git"},{"version":"8ceb984379462f94bdebef3288d569c6e1f912ea","status":"affected","lessThan":"d7dd034c14928306db1b46be277ae439b84dacf9","versionType":"git"},{"version":"8ceb984379462f94bdebef3288d569c6e1f912ea","status":"affected","lessThan":"e15605b68b490186da2ad8029c0351a9cfb0b9af","versionType":"git"},{"version":"8ceb984379462f94bdebef3288d569c6e1f912ea","status":"affected","lessThan":"896bb31e1416f582503db1350cf1bd10dc64e5a6","versionType":"git"},{"version":"8ceb984379462f94bdebef3288d569c6e1f912ea","status":"affected","lessThan":"c2b77f42205ef485a647f62082c442c1cd69d3fc","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/inode.c","fs/smb/client/smb2ops.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.7","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.158","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.114","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.55","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.5","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","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","fs/smb/client/smb2ops.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/d3c8ea197055c260119a13360e8202a27e53e1e4"},{"url":"https://git.kernel.org/stable/c/790282abe9d805f08618c1c24ea2529e7259b692"},{"url":"https://git.kernel.org/stable/c/d7dd034c14928306db1b46be277ae439b84dacf9"},{"url":"https://git.kernel.org/stable/c/e15605b68b490186da2ad8029c0351a9cfb0b9af"},{"url":"https://git.kernel.org/stable/c/896bb31e1416f582503db1350cf1bd10dc64e5a6"},{"url":"https://git.kernel.org/stable/c/c2b77f42205ef485a647f62082c442c1cd69d3fc"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:42:34.498Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"6.1.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"6.6.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"6.12.55"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"6.17.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"6.18"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}