CVE-2024-35863 (GCVE-0-2024-35863)
Vulnerability from cvelistv5 – Published: 2024-05-19 08:34 – Updated: 2026-08-05 11:30
VLAI
EPSS
VEX
Title
smb: client: fix potential UAF in is_valid_oplock_break()
Summary
In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix potential UAF in is_valid_oplock_break()
Skip sessions that are being teared down (status == SES_EXITING) to
avoid UAF.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:41 UTC
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
7f48558e6489d032b1584b0cc9ac4bb11072c034 , < 494c91e1e9413b407d12166a61b84200d4d54fac
(git)
Affected: 7f48558e6489d032b1584b0cc9ac4bb11072c034 , < 0a15ba88a32fa7a516aff7ffd27befed5334dff2 (git) Affected: 7f48558e6489d032b1584b0cc9ac4bb11072c034 , < 16d58c6a7db5050b9638669084b63fc05f951825 (git) Affected: 7f48558e6489d032b1584b0cc9ac4bb11072c034 , < 69ccf040acddf33a3a85ec0f6b45ef84b0f7ec29 (git) Affected: a67172a013953664b1dad03c648200c70b90506c (git) Affected: 3.12.48 , < 3.13 (semver) |
guessed | |
| Linux | Linux |
Affected:
3.13
Unaffected: 0 , < 3.13 (semver) Unaffected: 6.1.85 , ≤ 6.1.* (semver) Unaffected: 6.6.26 , ≤ 6.6.* (semver) Unaffected: 6.8.5 , ≤ 6.8.* (semver) Unaffected: 6.9 , ≤ * (original_commit_for_fix) |
guessed |
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},
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2024-35863",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-09-10T15:41:24.364295Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2024-09-11T12:42:15.910Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/smb/client/misc.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "494c91e1e9413b407d12166a61b84200d4d54fac",
"status": "affected",
"version": "7f48558e6489d032b1584b0cc9ac4bb11072c034",
"versionType": "git"
},
{
"lessThan": "0a15ba88a32fa7a516aff7ffd27befed5334dff2",
"status": "affected",
"version": "7f48558e6489d032b1584b0cc9ac4bb11072c034",
"versionType": "git"
},
{
"lessThan": "16d58c6a7db5050b9638669084b63fc05f951825",
"status": "affected",
"version": "7f48558e6489d032b1584b0cc9ac4bb11072c034",
"versionType": "git"
},
{
"lessThan": "69ccf040acddf33a3a85ec0f6b45ef84b0f7ec29",
"status": "affected",
"version": "7f48558e6489d032b1584b0cc9ac4bb11072c034",
"versionType": "git"
},
{
"status": "affected",
"version": "a67172a013953664b1dad03c648200c70b90506c",
"versionType": "git"
},
{
"lessThan": "3.13",
"status": "affected",
"version": "3.12.48",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"fs/smb/client/misc.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.13"
},
{
"lessThan": "3.13",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.85",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.26",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.8.*",
"status": "unaffected",
"version": "6.8.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.9",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.85",
"versionStartIncluding": "3.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.26",
"versionStartIncluding": "3.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.8.5",
"versionStartIncluding": "3.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.9",
"versionStartIncluding": "3.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.12.48",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix potential UAF in is_valid_oplock_break()\n\nSkip sessions that are being teared down (status == SES_EXITING) to\navoid UAF."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - The vulnerable walk is executed by the cifs demultiplex kernel thread directly on an unsolicited SMB1 LOCKING_ANDX frame read off the TCP/445 socket, so it is driven entirely by data from a remote SMB peer. A malicious/compromised file server, or an off-path/MITM injector on the unsigned SMB1 stream, reaches it over the network.\nAC:L - The attacker controls both sides of the race: it can force repeated session teardowns (DFS referrals/failover, forced reconnects, multiuser tlink expiry) and can hold the SES_EXITING window open arbitrarily long by stalling the blocking SMB LOGOFF reply that `__cifs_put_smb_ses()` waits on before unlinking and freeing the session, while flooding oplock-break frames. Attempts are unlimited and require no condition outside the attacker\u0027s influence.\nPR:N - No credentials or privileges on the victim client are needed \u2014 the oplock-break frame is dispatched with no UID/session lookup and no signature validation, so any peer able to put bytes on the client\u0027s SMB connection triggers the walk. The attacking entity is the server side of an existing mount, which holds no privilege on the vulnerable system.\nUI:N - Exploitation only requires an already-established SMB1 mount, which in practice is persistent (fstab/autofs/systemd, embedded and industrial NAS deployments); a compromised or malicious server then attacks at a time of its choosing with no action by any local user.\nS:U - The use-after-free corrupts kernel heap objects within the same kernel security authority as the vulnerable code. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - Use-after-free on `cifs_ses`/`cifs_tcon` structures lets the attacker reclaim the freed slab object with controlled content and have the kernel dereference and act on it, yielding a kernel-memory disclosure primitive. Session objects also hold credential material (auth keys, passwords), making leakage of highly sensitive data plausible.\nI:H - The UAF permits heap grooming so that attacker-shaped data occupies the freed session/tcon memory that is then written through and used for list and file-handle operations, giving a write/control-flow-hijack primitive. Per kernel CVSS guidance, memory corruption exploitable this way is scored High.\nA:H - Dereferencing freed session/tcon memory in the cifs demultiplex kernel thread readily produces an oops or panic, and the attacker can repeat it at will. Any kernel crash is High availability impact."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T11:30:27.234Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/494c91e1e9413b407d12166a61b84200d4d54fac"
},
{
"url": "https://git.kernel.org/stable/c/0a15ba88a32fa7a516aff7ffd27befed5334dff2"
},
{
"url": "https://git.kernel.org/stable/c/16d58c6a7db5050b9638669084b63fc05f951825"
},
{
"url": "https://git.kernel.org/stable/c/69ccf040acddf33a3a85ec0f6b45ef84b0f7ec29"
}
],
"title": "smb: client: fix potential UAF in is_valid_oplock_break()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-35863",
"datePublished": "2024-05-19T08:34:22.114Z",
"dateReserved": "2024-05-17T13:50:33.107Z",
"dateUpdated": "2026-08-05T11:30:27.234Z",
"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.