{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64136", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.036Z", "datePublished": "2026-07-19T15:40:30.351Z", "dateUpdated": "2026-07-20T13:43:41.329Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-20T13:43:41.329Z"}, "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()."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/smb2transport.c"], "versions": [{"version": "953953abb66e52c224057ab91e404284fefeab62", "lessThan": "7df1df6f40c0720d30206aa35c0343b962350e0d", "status": "affected", "versionType": "git"}, {"version": "601dd3b79769b38d30b693c40afdb2a4b7edf9d0", "lessThan": "13fb413ae22a37c69341918a6d651d19a9b0b9b7", "status": "affected", "versionType": "git"}, {"version": "3969db6b22e3d90d8c5f22ac1a7fe0350a94c136", "lessThan": "bf4ebdb19ff9b3cdf992b50715fe61633327416a", "status": "affected", "versionType": "git"}, {"version": "96c4af418586ee9a6aab61738644366426e05316", "lessThan": "e374f4e496fef8168784f93a4477d67be34485fd", "status": "affected", "versionType": "git"}, {"version": "96c4af418586ee9a6aab61738644366426e05316", "lessThan": "4d8690dace005a38e6dbde9ecce2da3ad85c7c41", "status": "affected", "versionType": "git"}, {"version": "8c59eeeeffa1524ef57e173a89a1a3ff539888d5", "status": "affected", "versionType": "git"}, {"version": "6.6.128", "lessThan": "6.6.142", "status": "affected", "versionType": "semver"}, {"version": "6.12.75", "lessThan": "6.12.92", "status": "affected", "versionType": "semver"}, {"version": "6.18.16", "lessThan": "6.18.34", "status": "affected", "versionType": "semver"}, {"version": "6.19.6", "lessThan": "6.20", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/smb2transport.c"], "versions": [{"version": "7.0", "status": "affected"}, {"version": "0", "lessThan": "7.0", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.142", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.92", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.11", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.128", "versionEndExcluding": "6.6.142"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.75", "versionEndExcluding": "6.12.92"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.16", "versionEndExcluding": "6.18.34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.0.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19.6"}]}]}], "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"}}}}

{}

{}

{}

{}