SUSE-SU-2026:20171-1
Vulnerability from csaf_suse - Published: 2026-01-28 10:27 - Updated: 2026-01-28 10:27Summary
Security update for the Linux Kernel (Live Patch 1 for SUSE Linux Enterprise 16)
Severity
Important
Notes
Title of the patch: Security update for the Linux Kernel (Live Patch 1 for SUSE Linux Enterprise 16)
Description of the patch:
This update for the SUSE Linux Enterprise kernel 6.12.0-160000.6.1 fixes various security issues
The following security issues were fixed:
- CVE-2025-39963: io_uring: fix incorrect io_kiocb reference in io_link_skb (bsc#1251982).
- CVE-2025-40204: sctp: Fix MAC comparison to be constant-time (bsc#1253437).
- CVE-2025-40212: nfsd: fix refcount leak in nfsd_set_fh_dentry() (bsc#1254196).
The following non security issues was fixed:
- Explicitly add module-common.c with vermagic and retpoline modinfo (bsc#1252270).
Patchnames: SUSE-SL-Micro-6.2-205
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
Affected products
Recommended
3 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Linux Micro 6.2:kernel-livepatch-6_12_0-160000_6-default-3-160000.1.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Micro 6.2:kernel-livepatch-6_12_0-160000_6-default-3-160000.1.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Micro 6.2:kernel-livepatch-6_12_0-160000_6-default-3-160000.1.1.x86_64 | — |
Vendor Fix
|
Threats
Impact
important
7.5 (High)
Affected products
Recommended
3 products, the same list as for
CVE-2025-39963
Threats
Impact
important
Affected products
Recommended
3 products, the same list as for
CVE-2025-39963
Threats
Impact
important
References
19 references
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"status": "final",
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"product_tree": {
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{
"branches": [
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{
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"name": "kernel-livepatch-6_12_0-160000_6-default-3-160000.1.1.ppc64le",
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"vulnerabilities": [
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"cve": "CVE-2025-39963",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2025-39963"
}
],
"notes": [
{
"category": "general",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: fix incorrect io_kiocb reference in io_link_skb\n\nIn io_link_skb function, there is a bug where prev_notif is incorrectly\nassigned using \u0027nd\u0027 instead of \u0027prev_nd\u0027. This causes the context\nvalidation check to compare the current notification with itself instead\nof comparing it with the previous notification.\n\nFix by using the correct prev_nd parameter when obtaining prev_notif.",
"title": "CVE description"
}
],
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"SUSE Linux Micro 6.2:kernel-livepatch-6_12_0-160000_6-default-3-160000.1.1.s390x",
"SUSE Linux Micro 6.2:kernel-livepatch-6_12_0-160000_6-default-3-160000.1.1.x86_64"
]
},
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"summary": "CVE-2025-39963",
"url": "https://www.suse.com/security/cve/CVE-2025-39963"
},
{
"category": "external",
"summary": "SUSE Bug 1251819 for CVE-2025-39963",
"url": "https://bugzilla.suse.com/1251819"
},
{
"category": "external",
"summary": "SUSE Bug 1251982 for CVE-2025-39963",
"url": "https://bugzilla.suse.com/1251982"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
"SUSE Linux Micro 6.2:kernel-livepatch-6_12_0-160000_6-default-3-160000.1.1.ppc64le",
"SUSE Linux Micro 6.2:kernel-livepatch-6_12_0-160000_6-default-3-160000.1.1.s390x",
"SUSE Linux Micro 6.2:kernel-livepatch-6_12_0-160000_6-default-3-160000.1.1.x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 7,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"products": [
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"SUSE Linux Micro 6.2:kernel-livepatch-6_12_0-160000_6-default-3-160000.1.1.s390x",
"SUSE Linux Micro 6.2:kernel-livepatch-6_12_0-160000_6-default-3-160000.1.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-01-28T10:27:58Z",
"details": "important"
}
],
"title": "CVE-2025-39963"
},
{
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"text": "https://www.suse.com/security/cve/CVE-2025-40204"
}
],
"notes": [
{
"category": "general",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: Fix MAC comparison to be constant-time\n\nTo prevent timing attacks, MACs need to be compared in constant time.\nUse the appropriate helper function for this.",
"title": "CVE description"
}
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"summary": "SUSE Bug 1253436 for CVE-2025-40204",
"url": "https://bugzilla.suse.com/1253436"
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"product_ids": [
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"SUSE Linux Micro 6.2:kernel-livepatch-6_12_0-160000_6-default-3-160000.1.1.s390x",
"SUSE Linux Micro 6.2:kernel-livepatch-6_12_0-160000_6-default-3-160000.1.1.x86_64"
]
}
],
"scores": [
{
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"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
},
"products": [
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"SUSE Linux Micro 6.2:kernel-livepatch-6_12_0-160000_6-default-3-160000.1.1.s390x",
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]
}
],
"threats": [
{
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"date": "2026-01-28T10:27:58Z",
"details": "important"
}
],
"title": "CVE-2025-40204"
},
{
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"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2025-40212"
}
],
"notes": [
{
"category": "general",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix refcount leak in nfsd_set_fh_dentry()\n\nnfsd exports a \"pseudo root filesystem\" which is used by NFSv4 to find\nthe various exported filesystems using LOOKUP requests from a known root\nfilehandle. NFSv3 uses the MOUNT protocol to find those exported\nfilesystems and so is not given access to the pseudo root filesystem.\n\nIf a v3 (or v2) client uses a filehandle from that filesystem,\nnfsd_set_fh_dentry() will report an error, but still stores the export\nin \"struct svc_fh\" even though it also drops the reference (exp_put()).\nThis means that when fh_put() is called an extra reference will be dropped\nwhich can lead to use-after-free and possible denial of service.\n\nNormal NFS usage will not provide a pseudo-root filehandle to a v3\nclient. This bug can only be triggered by the client synthesising an\nincorrect filehandle.\n\nTo fix this we move the assignments to the svc_fh later, after all\npossible error cases have been detected.",
"title": "CVE description"
}
],
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"SUSE Linux Micro 6.2:kernel-livepatch-6_12_0-160000_6-default-3-160000.1.1.s390x",
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]
},
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"summary": "CVE-2025-40212",
"url": "https://www.suse.com/security/cve/CVE-2025-40212"
},
{
"category": "external",
"summary": "SUSE Bug 1254195 for CVE-2025-40212",
"url": "https://bugzilla.suse.com/1254195"
}
],
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]
}
],
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{
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"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"products": [
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"SUSE Linux Micro 6.2:kernel-livepatch-6_12_0-160000_6-default-3-160000.1.1.s390x",
"SUSE Linux Micro 6.2:kernel-livepatch-6_12_0-160000_6-default-3-160000.1.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-01-28T10:27:58Z",
"details": "important"
}
],
"title": "CVE-2025-40212"
}
]
}
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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 |
|---|
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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