CVE-2026-64386

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix query_info() replay double-free A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_query_info_init() fails before the next send, cleanup retains the previous buffer type and frees that response again. Reset response bookkeeping before each attempt to prevent the stale free.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/100fb7c455fa86d248b8bd7bb9de757c192870b4	Patch
https://git.kernel.org/stable/c/2a88561d66eb855813cf004a0abe648bbb17de5e	Patch
https://git.kernel.org/stable/c/3c81dda84799f76b42aec598564316e2964440db	Patch
https://git.kernel.org/stable/c/89234773e8348918111aa15f6922b58cf3843364	Patch
https://git.kernel.org/stable/c/f1add4acb656f5a82806a1ab0e63fed3d8b1bfca	Patch

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel:6.8:-::::::
	cpe:2.3:o:linux:linux_kernel:6.8:rc2::::::
	cpe:2.3:o:linux:linux_kernel:6.8:rc3::::::
	cpe:2.3:o:linux:linux_kernel:6.8:rc4::::::
	cpe:2.3:o:linux:linux_kernel:6.8:rc5::::::
	cpe:2.3:o:linux:linux_kernel:6.8:rc6::::::
	cpe:2.3:o:linux:linux_kernel:6.8:rc7::::::

History

No history.

Information

Published : 2026-07-25 10:17

Updated : 2026-09-04 20:44

NVD link : CVE-2026-64386

Mitre link : CVE-2026-64386

CVE.ORG link : CVE-2026-64386

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-415

Double Free

{"id": "CVE-2026-64386", "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": "433042a91f9373241307725b52de573933ffedbf", "lessThan": "100fb7c455fa86d248b8bd7bb9de757c192870b4", "versionType": "git"}, {"status": "affected", "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "3c81dda84799f76b42aec598564316e2964440db", "versionType": "git"}, {"status": "affected", "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "f1add4acb656f5a82806a1ab0e63fed3d8b1bfca", "versionType": "git"}, {"status": "affected", "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "89234773e8348918111aa15f6922b58cf3843364", "versionType": "git"}, {"status": "affected", "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "2a88561d66eb855813cf004a0abe648bbb17de5e", "versionType": "git"}, {"status": "affected", "version": "6.6.32", "lessThan": "6.6.145", "versionType": "semver"}], "programFiles": ["fs/smb/client/smb2pdu.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.8"}, {"status": "unaffected", "version": "0", "lessThan": "6.8", "versionType": "semver"}, {"status": "unaffected", "version": "6.6.145", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.96", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.39", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.4", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/smb/client/smb2pdu.c"], "defaultStatus": "affected"}]}], "published": "2026-07-25T10:17:21.917", "references": [{"url": "https://git.kernel.org/stable/c/100fb7c455fa86d248b8bd7bb9de757c192870b4", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/2a88561d66eb855813cf004a0abe648bbb17de5e", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/3c81dda84799f76b42aec598564316e2964440db", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/89234773e8348918111aa15f6922b58cf3843364", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/f1add4acb656f5a82806a1ab0e63fed3d8b1bfca", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-415"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix query_info() replay double-free\n\nA response-bearing attempt can return a replayable error and free its\nresponse buffer. If SMB2_query_info_init() fails before the next send,\ncleanup retains the previous buffer type and frees that response again.\n\nReset response bookkeeping before each attempt to prevent the stale free."}], "lastModified": "2026-09-04T20:44:23.587", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E87EC5E7-E8A2-454C-B824-B59AD9398CF5", "versionEndExcluding": "6.6.145", "versionStartIncluding": "6.6.32"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FF057477-A6F6-4993-9DFB-969A787F9F33", "versionEndExcluding": "6.12.96", "versionStartIncluding": "6.8.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "914AE4BC-3D59-4C5A-9DB5-9CE327B429F7", "versionEndExcluding": "6.18.39", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6228DDD6-4557-4AA3-9F43-AB995D471E42", "versionEndExcluding": "7.1.4", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.8:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "41E47F32-BA80-4333-96FD-4D25082B0FDD"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "056BD938-0A27-4569-B391-30578B309EE3"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F02056A5-B362-4370-9FF8-6F0BD384D520"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "62075ACE-B2A0-4B16-829D-B3DA5AE5CC41"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A780F817-2A77-4130-A9B7-5C25606314E3"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AEB9199B-AB8F-4877-8964-E2BA95B5F15C"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc7:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C9B8A5CE-6D20-4C36-AC01-ACA4B70003A8"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}