CVE-2026-64136

{"id": "CVE-2026-64136", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "953953abb66e52c224057ab91e404284fefeab62", "lessThan": "7df1df6f40c0720d30206aa35c0343b962350e0d", "versionType": "git"}, {"status": "affected", "version": "601dd3b79769b38d30b693c40afdb2a4b7edf9d0", "lessThan": "13fb413ae22a37c69341918a6d651d19a9b0b9b7", "versionType": "git"}, {"status": "affected", "version": "3969db6b22e3d90d8c5f22ac1a7fe0350a94c136", "lessThan": "bf4ebdb19ff9b3cdf992b50715fe61633327416a", "versionType": "git"}, {"status": "affected", "version": "96c4af418586ee9a6aab61738644366426e05316", "lessThan": "e374f4e496fef8168784f93a4477d67be34485fd", "versionType": "git"}, {"status": "affected", "version": "96c4af418586ee9a6aab61738644366426e05316", "lessThan": "4d8690dace005a38e6dbde9ecce2da3ad85c7c41", "versionType": "git"}, {"status": "affected", "version": "8c59eeeeffa1524ef57e173a89a1a3ff539888d5", "versionType": "git"}, {"status": "affected", "version": "6.6.128", "lessThan": "6.6.142", "versionType": "semver"}, {"status": "affected", "version": "6.12.75", "lessThan": "6.12.92", "versionType": "semver"}, {"status": "affected", "version": "6.18.16", "lessThan": "6.18.34", "versionType": "semver"}, {"status": "affected", "version": "6.19.6", "lessThan": "6.20", "versionType": "semver"}], "programFiles": ["fs/smb/client/smb2transport.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "7.0"}, {"status": "unaffected", "version": "0", "lessThan": "7.0", "versionType": "semver"}, {"status": "unaffected", "version": "6.6.142", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.92", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.34", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.11", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/smb/client/smb2transport.c"], "defaultStatus": "affected"}]}], "published": "2026-07-19T16:17:55.463", "references": [{"url": "https://git.kernel.org/stable/c/13fb413ae22a37c69341918a6d651d19a9b0b9b7", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/4d8690dace005a38e6dbde9ecce2da3ad85c7c41", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/7df1df6f40c0720d30206aa35c0343b962350e0d", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/bf4ebdb19ff9b3cdf992b50715fe61633327416a", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/e374f4e496fef8168784f93a4477d67be34485fd", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "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()."}], "lastModified": "2026-08-13T15:08:29.567", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "637728F8-A8CA-4DE9-8032-CAC1DE6B6B44", "versionEndExcluding": "6.6.142", "versionStartIncluding": "6.6.128"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FCC171CA-8EB3-4BBA-9598-7821641E468A", "versionEndExcluding": "6.12.92", "versionStartIncluding": "6.12.75"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "19854A53-434C-4733-8EA0-563B5BE89FB1", "versionEndExcluding": "6.18.34", "versionStartIncluding": "6.18.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B9C1EA03-3A8A-42C6-914D-BDC5D48CD92C", "versionEndExcluding": "7.0.11", "versionStartIncluding": "6.19.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E5910A9D-F60A-409A-B486-FE66BFEBA9B9"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}