CVE-2026-64382 (GCVE-0-2026-64382)
Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-10-19 20:38
VLAI
EPSS
VEX
Title
smb: client: fix double-free in SMB2_open() replay
Summary
In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix double-free in SMB2_open() replay
A response-bearing attempt can return a replayable error and free its
response buffer. If SMB2_open_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.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:39 UTC
CWE
- CWE-415 - Double Free
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
433042a91f9373241307725b52de573933ffedbf , < 02bc2896bdc3e29362d6e40d404006944a159c25
(git)
Affected: 4f1fffa2376922f3d1d506e49c0fd445b023a28e , < 3196b5192f246df4272072f61a2f4a3e9967f55d (git) Affected: 4f1fffa2376922f3d1d506e49c0fd445b023a28e , < 14498ff5ce0f272ce0ef988721413e06b7038972 (git) Affected: 4f1fffa2376922f3d1d506e49c0fd445b023a28e , < ff2d30927bc3bf3c629f0768d2068096e64ef5ce (git) Affected: 4f1fffa2376922f3d1d506e49c0fd445b023a28e , < b55e182f2324bc6a604c21a47aa6c448f719a532 (git) Affected: 6.6.32 , < 6.6.145 (semver) |
guessed | |
| Linux | Linux |
Affected:
6.8
Unaffected: 0 , < 6.8 (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
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"version": "433042a91f9373241307725b52de573933ffedbf",
"versionType": "git"
},
{
"lessThan": "3196b5192f246df4272072f61a2f4a3e9967f55d",
"status": "affected",
"version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e",
"versionType": "git"
},
{
"lessThan": "14498ff5ce0f272ce0ef988721413e06b7038972",
"status": "affected",
"version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e",
"versionType": "git"
},
{
"lessThan": "ff2d30927bc3bf3c629f0768d2068096e64ef5ce",
"status": "affected",
"version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e",
"versionType": "git"
},
{
"lessThan": "b55e182f2324bc6a604c21a47aa6c448f719a532",
"status": "affected",
"version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e",
"versionType": "git"
},
{
"lessThan": "6.6.145",
"status": "affected",
"version": "6.6.32",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"fs/smb/client/smb2pdu.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.8"
},
{
"lessThan": "6.8",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.96",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.39",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.145",
"versionStartIncluding": "6.6.32",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.96",
"versionStartIncluding": "6.8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.39",
"versionStartIncluding": "6.8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.4",
"versionStartIncluding": "6.8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "6.8",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix double-free in SMB2_open() replay\n\nA response-bearing attempt can return a replayable error and free its\nresponse buffer. If SMB2_open_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."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - A malicious SMB2/SMB3 server can trigger the flaw through network-delivered CREATE error responses after a victim mounts or accesses its share.\nAC:L - The server controls the replayable status and can disconnect or refuse reconnection so the next initialization fails; it can repeat the sequence to overcome scheduling variance.\nPR:N - The attacking server needs no account or privileges on the client, because the victim supplies the mounted SMB session and initiates the request.\nUI:R - A victim must mount the malicious share or perform an operation such as statfs, ACL access, notification, or file access that causes SMB2_open() to run.\nS:U - The double-free corrupts memory within the client kernel\u0027s existing security authority and does not inherently cross a VM or IOMMU boundary.\nC:H - The double-free can produce overlapping live SMB buffers and use-after-free access, supporting kernel-memory disclosure and arbitrary-read exploitation.\nI:H - Reallocation of the freed mempool object permits attacker-controlled network data to corrupt live kernel objects or allocator metadata, enabling arbitrary writes or control-flow hijacking.\nA:H - The double-free can immediately trigger allocator diagnostics or heap corruption leading to a kernel oops or panic, and the server can repeatedly retrigger it."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T04:54:33.945Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/02bc2896bdc3e29362d6e40d404006944a159c25"
},
{
"url": "https://git.kernel.org/stable/c/3196b5192f246df4272072f61a2f4a3e9967f55d"
},
{
"url": "https://git.kernel.org/stable/c/14498ff5ce0f272ce0ef988721413e06b7038972"
},
{
"url": "https://git.kernel.org/stable/c/ff2d30927bc3bf3c629f0768d2068096e64ef5ce"
},
{
"url": "https://git.kernel.org/stable/c/b55e182f2324bc6a604c21a47aa6c448f719a532"
}
],
"title": "smb: client: fix double-free in SMB2_open() replay",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-64382",
"datePublished": "2026-07-25T08:50:31.937Z",
"dateReserved": "2026-07-19T15:36:31.784Z",
"dateUpdated": "2026-10-19T20:38:25.998Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.