{"api_version":"1","generated_at":"2026-07-20T14:42:00+00:00","cve":"CVE-2026-64136","urls":{"html":"https://cve.report/CVE-2026-64136","api":"https://cve.report/api/cve/CVE-2026-64136.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64136","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64136"},"summary":{"title":"smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()\n\nCommit 96c4af418586 (\"cifs: Fix locking usage for tcon fields\")\nrefactored cifs code to change cifs_tcp_ses_lock for tc_lock around\ntc_count changes.\n\nThere was missing lock around tc_count increment inside\nsmb2_find_smb_sess_tcon_unlocked().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:55","updated_at":"2026-07-19 16:17:55"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/4d8690dace005a38e6dbde9ecce2da3ad85c7c41","name":"https://git.kernel.org/stable/c/4d8690dace005a38e6dbde9ecce2da3ad85c7c41","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e374f4e496fef8168784f93a4477d67be34485fd","name":"https://git.kernel.org/stable/c/e374f4e496fef8168784f93a4477d67be34485fd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7df1df6f40c0720d30206aa35c0343b962350e0d","name":"https://git.kernel.org/stable/c/7df1df6f40c0720d30206aa35c0343b962350e0d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bf4ebdb19ff9b3cdf992b50715fe61633327416a","name":"https://git.kernel.org/stable/c/bf4ebdb19ff9b3cdf992b50715fe61633327416a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/13fb413ae22a37c69341918a6d651d19a9b0b9b7","name":"https://git.kernel.org/stable/c/13fb413ae22a37c69341918a6d651d19a9b0b9b7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64136","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64136","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 953953abb66e52c224057ab91e404284fefeab62 7df1df6f40c0720d30206aa35c0343b962350e0d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 601dd3b79769b38d30b693c40afdb2a4b7edf9d0 13fb413ae22a37c69341918a6d651d19a9b0b9b7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3969db6b22e3d90d8c5f22ac1a7fe0350a94c136 bf4ebdb19ff9b3cdf992b50715fe61633327416a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 96c4af418586ee9a6aab61738644366426e05316 e374f4e496fef8168784f93a4477d67be34485fd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 96c4af418586ee9a6aab61738644366426e05316 4d8690dace005a38e6dbde9ecce2da3ad85c7c41 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8c59eeeeffa1524ef57e173a89a1a3ff539888d5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6.128 6.6.142 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12.75 6.12.92 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.18.16 6.18.34 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.19.6 6.20 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.0","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.142 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.92 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.34 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.11 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/smb/client/smb2transport.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"7df1df6f40c0720d30206aa35c0343b962350e0d","status":"affected","version":"953953abb66e52c224057ab91e404284fefeab62","versionType":"git"},{"lessThan":"13fb413ae22a37c69341918a6d651d19a9b0b9b7","status":"affected","version":"601dd3b79769b38d30b693c40afdb2a4b7edf9d0","versionType":"git"},{"lessThan":"bf4ebdb19ff9b3cdf992b50715fe61633327416a","status":"affected","version":"3969db6b22e3d90d8c5f22ac1a7fe0350a94c136","versionType":"git"},{"lessThan":"e374f4e496fef8168784f93a4477d67be34485fd","status":"affected","version":"96c4af418586ee9a6aab61738644366426e05316","versionType":"git"},{"lessThan":"4d8690dace005a38e6dbde9ecce2da3ad85c7c41","status":"affected","version":"96c4af418586ee9a6aab61738644366426e05316","versionType":"git"},{"status":"affected","version":"8c59eeeeffa1524ef57e173a89a1a3ff539888d5","versionType":"git"},{"lessThan":"6.6.142","status":"affected","version":"6.6.128","versionType":"semver"},{"lessThan":"6.12.92","status":"affected","version":"6.12.75","versionType":"semver"},{"lessThan":"6.18.34","status":"affected","version":"6.18.16","versionType":"semver"},{"lessThan":"6.20","status":"affected","version":"6.19.6","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/smb/client/smb2transport.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"7.0"},{"lessThan":"7.0","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.142","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.92","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.34","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.11","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.142","versionStartIncluding":"6.6.128","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.92","versionStartIncluding":"6.12.75","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.34","versionStartIncluding":"6.18.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.11","versionStartIncluding":"7.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"7.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19.6","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()\n\nCommit 96c4af418586 (\"cifs: Fix locking usage for tcon fields\")\nrefactored cifs code to change cifs_tcp_ses_lock for tc_lock around\ntc_count changes.\n\nThere was missing lock around tc_count increment inside\nsmb2_find_smb_sess_tcon_unlocked()."}],"providerMetadata":{"dateUpdated":"2026-07-19T15:40:30.351Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/7df1df6f40c0720d30206aa35c0343b962350e0d"},{"url":"https://git.kernel.org/stable/c/13fb413ae22a37c69341918a6d651d19a9b0b9b7"},{"url":"https://git.kernel.org/stable/c/bf4ebdb19ff9b3cdf992b50715fe61633327416a"},{"url":"https://git.kernel.org/stable/c/e374f4e496fef8168784f93a4477d67be34485fd"},{"url":"https://git.kernel.org/stable/c/4d8690dace005a38e6dbde9ecce2da3ad85c7c41"}],"title":"smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64136","datePublished":"2026-07-19T15:40:30.351Z","dateReserved":"2026-07-19T07:54:57.036Z","dateUpdated":"2026-07-19T15:40:30.351Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 16:17:55","lastModifiedDate":"2026-07-19 16:17:55","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64136","Ordinal":"1","Title":"smb: client: protect tc_count increment in smb2_find_smb_sess_tc","CVE":"CVE-2026-64136","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64136","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()\n\nCommit 96c4af418586 (\"cifs: Fix locking usage for tcon fields\")\nrefactored cifs code to change cifs_tcp_ses_lock for tc_lock around\ntc_count changes.\n\nThere was missing lock around tc_count increment inside\nsmb2_find_smb_sess_tcon_unlocked().","Type":"Description","Title":"smb: client: protect tc_count increment in smb2_find_smb_sess_tc"}]}}}