CVE-2026-52967 (GCVE-0-2026-52967)
Vulnerability from cvelistv5 – Published: 2026-06-24 16:28 – Updated: 2026-08-05 12:32
VLAI
EPSS
VEX
Title
smb/client: fix possible infinite loop and oob read in symlink_data()
Summary
In the Linux kernel, the following vulnerability has been resolved:
smb/client: fix possible infinite loop and oob read in symlink_data()
On 32-bit architectures, the infinite loop is as follows:
len = p->ErrorDataLength == 0xfffffff8
u8 *next = p->ErrorContextData + len
next == p
On 32-bit architectures, the out-of-bounds read is as follows:
len = p->ErrorDataLength == 0xfffffff0
u8 *next = p->ErrorContextData + len
next == (u8 *)p - 8
Severity
8.1 (High)
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
76894f3e2f71177747b8b4763fb180e800279585 , < 1cfa2d59f669db28d6292d10ff87ca6837c781b0
(git)
Affected: 76894f3e2f71177747b8b4763fb180e800279585 , < b41598bf54b3fe528994e573df6008f8f4d0a4f4 (git) Affected: 76894f3e2f71177747b8b4763fb180e800279585 , < cd4b9b662f0fb9aa97ee6bf9034eca76fc6cab23 (git) Affected: 76894f3e2f71177747b8b4763fb180e800279585 , < 97a05b0ae9ea5ec052be2eef0f9cc7ce03501bbb (git) Affected: 76894f3e2f71177747b8b4763fb180e800279585 , < 1b9331b16b0ed9414dcf7583d8134bdfeb117aae (git) Affected: 76894f3e2f71177747b8b4763fb180e800279585 , < 7d9a7f1f96cd617ee9e75bb22217c709038e26b8 (git) Affected: 2d046892a493d9760c35fdaefc3017f27f91b621 (git) Affected: 6.0.16 , < 6.1 (semver) |
guessed | |
| Linux | Linux |
Affected:
6.1
Unaffected: 0 , < 6.1 (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.141 , ≤ 6.6.* (semver) Unaffected: 6.12.91 , ≤ 6.12.* (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "AV:N - The vulnerable SMB client parser consumes an SMB2 CREATE error response supplied by a remote SMB server over the network. A malicious or compromised SMB share can send the crafted `STATUS_STOPPED_ON_SYMLINK` response.\nAC:L - The server directly controls `ErrorContextCount`, `ByteCount`, `ErrorId`, and `ErrorDataLength`, and no race or hard-to-hit state is required. Although the wraparound behavior is 32-bit specific, that is a deployment property rather than an attacker-uncontrolled exploitation condition.\nPR:N - The attacker needs no privileges on the victim system; they only need to operate or control the SMB server endpoint that the client connects to. The path can also be reached through guest or null-auth SMB sessions.\nUI:R - The victim client must mount/connect to the SMB share and perform a path operation such as lookup, stat, open, or create that causes an SMB2 CREATE response to be parsed. The remote server cannot trigger this parser without client-side filesystem activity.\nS:U - The affected component is the Linux kernel SMB client, and the impact is to the same kernel/client security authority. This is not a VM escape, IOMMU bypass, or cross-scope sandbox escape.\nC:H - The bug is an out-of-bounds kernel read in a server-controlled response parser, and the read is not strictly bounded to only a few harmless bytes. Following the required conservative rule, this is scored as high confidentiality impact.\nI:N - The defect advances a parser pointer incorrectly and reads from the wrong location, but it does not write out of bounds or provide a kernel memory write primitive. No direct integrity impact beyond normal malicious-server control of SMB content was identified.\nA:H - The crafted length can make the parser loop indefinitely on 32-bit systems, causing a reliable denial of service. Other malformed pointer positions can also lead to invalid kernel reads and possible oops conditions."
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},
{
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"datePublished": "2026-06-24T16:28:46.661Z",
"dateReserved": "2026-06-09T07:44:35.374Z",
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"title": "smb/client: fix possible infinite loop and oob read in symlink_data()",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-52967.json",
"version": "2"
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}
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"attackVector": "NETWORK",
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"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
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"vulnStatus": "Analyzed",
"weaknesses": [
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"description": [
{
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"value": "CWE-125"
}
],
"source": "nvd@nist.gov",
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"id": "CVE-2026-52967",
"initial_release_date": "2026-06-24T00:00:00+00:00",
"product_status:known_affected": "184",
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"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: smb/client: fix possible infinite loop and oob read in symlink_data()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52967.json",
"version": "3"
},
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"current_release_date": "2026-09-10T17:00:14Z",
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"id": "CVE-2026-52967",
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"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-52967",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-52967.json",
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}
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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 |
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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.
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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.
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