{"id":"CVE-2026-64384","state":"PUBLISHED","title":"smb: client: fix change notify replay double-free","description":"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.","publishedAt":"2026-07-25T08:50:33.306Z","updatedAt":"2026-10-19T20:38:26.294Z","severity":{"score":9.8,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"433042a91f9373241307725b52de573933ffedbf","status":"affected","lessThan":"5821f9dbb8b5b24391850a13418e633edd0fb003","versionType":"git"},{"version":"4f1fffa2376922f3d1d506e49c0fd445b023a28e","status":"affected","lessThan":"d684f4134998085702009b94c35c2003fc9e72d3","versionType":"git"},{"version":"4f1fffa2376922f3d1d506e49c0fd445b023a28e","status":"affected","lessThan":"52af1975f0dfae990c5a0e85872cc41be0e88a68","versionType":"git"},{"version":"4f1fffa2376922f3d1d506e49c0fd445b023a28e","status":"affected","lessThan":"901891513951bc8322ece754863909ea45af95c6","versionType":"git"},{"version":"4f1fffa2376922f3d1d506e49c0fd445b023a28e","status":"affected","lessThan":"145f820dcbb2cced374f2532f8a61a44dce4a615","versionType":"git"},{"version":"6.6.32","status":"affected","lessThan":"6.6.145","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/smb2pdu.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.8","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/smb2pdu.c"]}],"references":["https://git.kernel.org/stable/c/5821f9dbb8b5b24391850a13418e633edd0fb003","https://git.kernel.org/stable/c/d684f4134998085702009b94c35c2003fc9e72d3","https://git.kernel.org/stable/c/52af1975f0dfae990c5a0e85872cc41be0e88a68","https://git.kernel.org/stable/c/901891513951bc8322ece754863909ea45af95c6","https://git.kernel.org/stable/c/145f820dcbb2cced374f2532f8a61a44dce4a615"],"weaknesses":["CWE-415"],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64384.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64384","state":"PUBLISHED","datePublished":"2026-07-25T08:50:33.306Z","dateUpdated":"2026-10-19T20:38:26.294Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.784Z"},"containers":{"cna":{"title":"smb: client: fix change notify replay double-free","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"433042a91f9373241307725b52de573933ffedbf","status":"affected","lessThan":"5821f9dbb8b5b24391850a13418e633edd0fb003","versionType":"git"},{"version":"4f1fffa2376922f3d1d506e49c0fd445b023a28e","status":"affected","lessThan":"d684f4134998085702009b94c35c2003fc9e72d3","versionType":"git"},{"version":"4f1fffa2376922f3d1d506e49c0fd445b023a28e","status":"affected","lessThan":"52af1975f0dfae990c5a0e85872cc41be0e88a68","versionType":"git"},{"version":"4f1fffa2376922f3d1d506e49c0fd445b023a28e","status":"affected","lessThan":"901891513951bc8322ece754863909ea45af95c6","versionType":"git"},{"version":"4f1fffa2376922f3d1d506e49c0fd445b023a28e","status":"affected","lessThan":"145f820dcbb2cced374f2532f8a61a44dce4a615","versionType":"git"},{"version":"6.6.32","status":"affected","lessThan":"6.6.145","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/smb2pdu.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.8","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/smb2pdu.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/5821f9dbb8b5b24391850a13418e633edd0fb003"},{"url":"https://git.kernel.org/stable/c/d684f4134998085702009b94c35c2003fc9e72d3"},{"url":"https://git.kernel.org/stable/c/52af1975f0dfae990c5a0e85872cc41be0e88a68"},{"url":"https://git.kernel.org/stable/c/901891513951bc8322ece754863909ea45af95c6"},{"url":"https://git.kernel.org/stable/c/145f820dcbb2cced374f2532f8a61a44dce4a615"}],"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"},"scenarios":[{"lang":"en","value":"AV:N - A malicious SMB server can return a replayable response and then force reconnect failure over the network, causing the client to free stale response state twice.\nAC:L - The peer controls both prerequisites by returning a status such as STATUS_RETRY and then disconnecting or refusing reconnection; repeated attempts make the scheduling window attacker-controllable.\nPR:N - The malicious SMB peer requires no account, capability, or other privilege on the vulnerable client; the established client session does not grant the attacker privileges on that host.\nUI:N - An ordinary automated CIFS workload can maintain an outstanding change-notify request, after which the remote peer completes the trigger without human involvement.\nS:U - Exploitation compromises the kernel and resources governed by the same host security authority, without crossing a separate virtualization or sandbox boundary.\nC:H - The double-free corrupts the CIFS response-buffer slab or mempool, permitting overlapping live objects and freelist manipulation that can support disclosure of arbitrary kernel memory.\nI:H - The heap corruption can provide attacker-influenced writes through aliased request and response buffers or freelist poisoning, potentially enabling kernel control-flow hijacking.\nA:H - Hardened allocators can immediately panic on the consecutive double-free, while unhardened allocators can crash later through freelist corruption."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:54:36.154Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.32","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"6.12.96"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-64384","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:39:54.936911Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-415","lang":"en","type":"CWE","description":"CWE-415 Double Free"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T20:38:26.294Z"}}]}}}