{"id":"CVE-2026-23205","state":"PUBLISHED","title":"smb/client: fix memory leak in smb2_open_file()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb/client: fix memory leak in smb2_open_file()\n\nReproducer:\n\n  1. server: directories are exported read-only\n  2. client: mount -t cifs //${server_ip}/export /mnt\n  3. client: dd if=/dev/zero of=/mnt/file bs=512 count=1000 oflag=direct\n  4. client: umount /mnt\n  5. client: sleep 1\n  6. client: modprobe -r cifs\n\nThe error message is as follows:\n\n  =============================================================================\n  BUG cifs_small_rq (Not tainted): Objects remaining on __kmem_cache_shutdown()\n  -----------------------------------------------------------------------------\n\n  Object 0x00000000d47521be @offset=14336\n  ...\n  WARNING: mm/slub.c:1251 at __kmem_cache_shutdown+0x34e/0x440, CPU#0: modprobe/1577\n  ...\n  Call Trace:\n   <TASK>\n   kmem_cache_destroy+0x94/0x190\n   cifs_destroy_request_bufs+0x3e/0x50 [cifs]\n   cleanup_module+0x4e/0x540 [cifs]\n   __se_sys_delete_module+0x278/0x400\n   __x64_sys_delete_module+0x5f/0x70\n   x64_sys_call+0x2299/0x2ff0\n   do_syscall_64+0x89/0x350\n   entry_SYSCALL_64_after_hwframe+0x76/0x7e\n  ...\n  kmem_cache_destroy cifs_small_rq: Slab cache still has objects when called from cifs_destroy_request_bufs+0x3e/0x50 [cifs]\n  WARNING: mm/slab_common.c:532 at kmem_cache_destroy+0x16b/0x190, CPU#0: modprobe/1577","publishedAt":"2026-02-14T16:27:28.409Z","updatedAt":"2026-05-23T16:04:10.175Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"17e53a15e64b65623b8f2b1185d27d7b1cbf69ab","status":"affected","lessThan":"743f70406264348c0830f38409eb6c40a42fb2db","versionType":"git"},{"version":"18066188eb90cc0c798f3370a8078a79ddb73f70","status":"affected","lessThan":"3a6d6b332f92990958602c1e35ce0173e2dd62e9","versionType":"git"},{"version":"6ebb9d54eccc8026b386e76eff69364d33373da5","status":"affected","lessThan":"b64e3b5d8d759dd4333992e4ba4dadf9359952c8","versionType":"git"},{"version":"e255612b5ed9f179abe8196df7c2ba09dd227900","status":"affected","lessThan":"9ee608a64e37cea5b4b13e436c559dd0fb2ad1b5","versionType":"git"},{"version":"e255612b5ed9f179abe8196df7c2ba09dd227900","status":"affected","lessThan":"e3a43633023e3cacaca60d4b8972d084a2b06236","versionType":"git"},{"version":"bcd15f06c7e8904116cfb06526bcc189b86aff85","status":"affected","versionType":"git"},{"version":"6.1.141","status":"affected","lessThan":"6.1.163","versionType":"semver"},{"version":"6.6.93","status":"affected","lessThan":"6.6.124","versionType":"semver"},{"version":"6.12.31","status":"affected","lessThan":"6.12.70","versionType":"semver"},{"version":"6.14.9","status":"affected","lessThan":"6.15","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/smb2file.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.15","versionType":"semver"},{"version":"6.1.163","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.124","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.70","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.10","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","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/smb2file.c"]}],"references":["https://git.kernel.org/stable/c/743f70406264348c0830f38409eb6c40a42fb2db","https://git.kernel.org/stable/c/3a6d6b332f92990958602c1e35ce0173e2dd62e9","https://git.kernel.org/stable/c/b64e3b5d8d759dd4333992e4ba4dadf9359952c8","https://git.kernel.org/stable/c/9ee608a64e37cea5b4b13e436c559dd0fb2ad1b5","https://git.kernel.org/stable/c/e3a43633023e3cacaca60d4b8972d084a2b06236"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23205.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23205","state":"PUBLISHED","datePublished":"2026-02-14T16:27:28.409Z","dateUpdated":"2026-05-23T16:04:10.175Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-01-13T15:37:45.986Z"},"containers":{"cna":{"title":"smb/client: fix memory leak in smb2_open_file()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb/client: fix memory leak in smb2_open_file()\n\nReproducer:\n\n  1. server: directories are exported read-only\n  2. client: mount -t cifs //${server_ip}/export /mnt\n  3. client: dd if=/dev/zero of=/mnt/file bs=512 count=1000 oflag=direct\n  4. client: umount /mnt\n  5. client: sleep 1\n  6. client: modprobe -r cifs\n\nThe error message is as follows:\n\n  =============================================================================\n  BUG cifs_small_rq (Not tainted): Objects remaining on __kmem_cache_shutdown()\n  -----------------------------------------------------------------------------\n\n  Object 0x00000000d47521be @offset=14336\n  ...\n  WARNING: mm/slub.c:1251 at __kmem_cache_shutdown+0x34e/0x440, CPU#0: modprobe/1577\n  ...\n  Call Trace:\n   <TASK>\n   kmem_cache_destroy+0x94/0x190\n   cifs_destroy_request_bufs+0x3e/0x50 [cifs]\n   cleanup_module+0x4e/0x540 [cifs]\n   __se_sys_delete_module+0x278/0x400\n   __x64_sys_delete_module+0x5f/0x70\n   x64_sys_call+0x2299/0x2ff0\n   do_syscall_64+0x89/0x350\n   entry_SYSCALL_64_after_hwframe+0x76/0x7e\n  ...\n  kmem_cache_destroy cifs_small_rq: Slab cache still has objects when called from cifs_destroy_request_bufs+0x3e/0x50 [cifs]\n  WARNING: mm/slab_common.c:532 at kmem_cache_destroy+0x16b/0x190, CPU#0: modprobe/1577"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"17e53a15e64b65623b8f2b1185d27d7b1cbf69ab","status":"affected","lessThan":"743f70406264348c0830f38409eb6c40a42fb2db","versionType":"git"},{"version":"18066188eb90cc0c798f3370a8078a79ddb73f70","status":"affected","lessThan":"3a6d6b332f92990958602c1e35ce0173e2dd62e9","versionType":"git"},{"version":"6ebb9d54eccc8026b386e76eff69364d33373da5","status":"affected","lessThan":"b64e3b5d8d759dd4333992e4ba4dadf9359952c8","versionType":"git"},{"version":"e255612b5ed9f179abe8196df7c2ba09dd227900","status":"affected","lessThan":"9ee608a64e37cea5b4b13e436c559dd0fb2ad1b5","versionType":"git"},{"version":"e255612b5ed9f179abe8196df7c2ba09dd227900","status":"affected","lessThan":"e3a43633023e3cacaca60d4b8972d084a2b06236","versionType":"git"},{"version":"bcd15f06c7e8904116cfb06526bcc189b86aff85","status":"affected","versionType":"git"},{"version":"6.1.141","status":"affected","lessThan":"6.1.163","versionType":"semver"},{"version":"6.6.93","status":"affected","lessThan":"6.6.124","versionType":"semver"},{"version":"6.12.31","status":"affected","lessThan":"6.12.70","versionType":"semver"},{"version":"6.14.9","status":"affected","lessThan":"6.15","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/smb2file.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.15","versionType":"semver"},{"version":"6.1.163","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.124","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.70","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.10","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","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/smb2file.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/743f70406264348c0830f38409eb6c40a42fb2db"},{"url":"https://git.kernel.org/stable/c/3a6d6b332f92990958602c1e35ce0173e2dd62e9"},{"url":"https://git.kernel.org/stable/c/b64e3b5d8d759dd4333992e4ba4dadf9359952c8"},{"url":"https://git.kernel.org/stable/c/9ee608a64e37cea5b4b13e436c559dd0fb2ad1b5"},{"url":"https://git.kernel.org/stable/c/e3a43633023e3cacaca60d4b8972d084a2b06236"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-23T16:04:10.175Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.141","versionEndExcluding":"6.1.163"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.93","versionEndExcluding":"6.6.124"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.31","versionEndExcluding":"6.12.70"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"6.18.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"6.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14.9"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}