CVE-2026-64384

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix change notify replay double-free A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_notify_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/145f820dcbb2cced374f2532f8a61a44dce4a615	Patch
https://git.kernel.org/stable/c/52af1975f0dfae990c5a0e85872cc41be0e88a68	Patch
https://git.kernel.org/stable/c/5821f9dbb8b5b24391850a13418e633edd0fb003	Patch
https://git.kernel.org/stable/c/901891513951bc8322ece754863909ea45af95c6	Patch
https://git.kernel.org/stable/c/d684f4134998085702009b94c35c2003fc9e72d3	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 20:46

NVD link : CVE-2026-64384

Mitre link : CVE-2026-64384

CVE.ORG link : CVE-2026-64384

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-415

Double Free

{"id": "CVE-2026-64384", "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": "5821f9dbb8b5b24391850a13418e633edd0fb003", "versionType": "git"}, {"status": "affected", "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "d684f4134998085702009b94c35c2003fc9e72d3", "versionType": "git"}, {"status": "affected", "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "52af1975f0dfae990c5a0e85872cc41be0e88a68", "versionType": "git"}, {"status": "affected", "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "901891513951bc8322ece754863909ea45af95c6", "versionType": "git"}, {"status": "affected", "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "145f820dcbb2cced374f2532f8a61a44dce4a615", "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": "2026-07-25T10:17:21.700", "references": [{"url": "https://git.kernel.org/stable/c/145f820dcbb2cced374f2532f8a61a44dce4a615", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/52af1975f0dfae990c5a0e85872cc41be0e88a68", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/5821f9dbb8b5b24391850a13418e633edd0fb003", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/901891513951bc8322ece754863909ea45af95c6", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/d684f4134998085702009b94c35c2003fc9e72d3", "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 change notify replay double-free\n\nA response-bearing attempt can return a replayable error and free its\nresponse buffer. If SMB2_notify_init() fails before the next send, cleanup\nretains the previous buffer type and frees that response again.\n\nReset response bookkeeping before each attempt to prevent the stale free."}], "lastModified": "2026-09-04T20:46:01.823", "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"}