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CERTFR-2021-AVI-265
Vulnerability from certfr_avis - Published: 2021-04-15 - Updated: 2021-04-15
De multiples vulnérabilités ont été découvertes dans le noyau Linux d'Ubuntu. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire, un déni de service et un contournement de la politique de sécurité.
Solution
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
NoneImpacted products
References
| Title | Publication Time | Tags | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Ubuntu 16.04 LTS",
"product": {
"name": "Ubuntu",
"vendor": {
"name": "Ubuntu",
"scada": false
}
}
},
{
"description": "Ubuntu 20.10",
"product": {
"name": "Ubuntu",
"vendor": {
"name": "Ubuntu",
"scada": false
}
}
},
{
"description": "Ubuntu 18.04 LTS",
"product": {
"name": "Ubuntu",
"vendor": {
"name": "Ubuntu",
"scada": false
}
}
},
{
"description": "Ubuntu 20.04 LTS",
"product": {
"name": "Ubuntu",
"vendor": {
"name": "Ubuntu",
"scada": false
}
}
},
{
"description": "Ubuntu 14.04 ESM",
"product": {
"name": "Ubuntu",
"vendor": {
"name": "Ubuntu",
"scada": false
}
}
}
],
"affected_systems_content": null,
"content": "## Solution\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des\ncorrectifs (cf. section Documentation).\n",
"cves": [
{
"name": "CVE-2021-20261",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-20261"
},
{
"name": "CVE-2020-14390",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-14390"
},
{
"name": "CVE-2021-20239",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-20239"
},
{
"name": "CVE-2021-26931",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-26931"
},
{
"name": "CVE-2020-25285",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-25285"
},
{
"name": "CVE-2021-3411",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-3411"
},
{
"name": "CVE-2019-19061",
"url": "https://www.cve.org/CVERecord?id=CVE-2019-19061"
},
{
"name": "CVE-2020-0466",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-0466"
},
{
"name": "CVE-2021-29154",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-29154"
},
{
"name": "CVE-2015-1350",
"url": "https://www.cve.org/CVERecord?id=CVE-2015-1350"
},
{
"name": "CVE-2021-26930",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-26930"
},
{
"name": "CVE-2019-16231",
"url": "https://www.cve.org/CVERecord?id=CVE-2019-16231"
},
{
"name": "CVE-2020-27830",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-27830"
},
{
"name": "CVE-2020-25639",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-25639"
},
{
"name": "CVE-2017-16644",
"url": "https://www.cve.org/CVERecord?id=CVE-2017-16644"
},
{
"name": "CVE-2019-16232",
"url": "https://www.cve.org/CVERecord?id=CVE-2019-16232"
},
{
"name": "CVE-2020-36158",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-36158"
},
{
"name": "CVE-2021-28038",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-28038"
},
{
"name": "CVE-2021-28950",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-28950"
},
{
"name": "CVE-2020-25669",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-25669"
},
{
"name": "CVE-2021-3348",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-3348"
},
{
"name": "CVE-2021-20194",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-20194"
},
{
"name": "CVE-2021-3347",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-3347"
},
{
"name": "CVE-2021-3178",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-3178"
},
{
"name": "CVE-2018-13095",
"url": "https://www.cve.org/CVERecord?id=CVE-2018-13095"
},
{
"name": "CVE-2021-20268",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-20268"
},
{
"name": "CVE-2020-14351",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-14351"
},
{
"name": "CVE-2020-25645",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-25645"
},
{
"name": "CVE-2020-0423",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-0423"
},
{
"name": "CVE-2017-5967",
"url": "https://www.cve.org/CVERecord?id=CVE-2017-5967"
},
{
"name": "CVE-2020-0465",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-0465"
},
{
"name": "CVE-2021-28375",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-28375"
}
],
"initial_release_date": "2021-04-15T00:00:00",
"last_revision_date": "2021-04-15T00:00:00",
"links": [],
"reference": "CERTFR-2021-AVI-265",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2021-04-15T00:00:00.000000"
}
],
"risks": [
{
"description": "Ex\u00e9cution de code arbitraire"
},
{
"description": "D\u00e9ni de service"
},
{
"description": "Contournement de la politique de s\u00e9curit\u00e9"
},
{
"description": "Atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es"
},
{
"description": "\u00c9l\u00e9vation de privil\u00e8ges"
}
],
"summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans le noyau Linux\nd\u0027Ubuntu. Certaines d\u0027entre elles permettent \u00e0 un attaquant de provoquer\nune ex\u00e9cution de code arbitraire, un d\u00e9ni de service et un contournement\nde la politique de s\u00e9curit\u00e9.\n",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans le noyau Linux d\u0027Ubuntu",
"vendor_advisories": [
{
"published_at": null,
"title": "Bulletin de s\u00e9curit\u00e9 Ubuntu USN-4912-1 du 13 avril 2021",
"url": "https://ubuntu.com/security/notices/USN-4912-1"
},
{
"published_at": null,
"title": "Bulletin de s\u00e9curit\u00e9 Ubuntu USN-4904-1 du 13 avril 2021",
"url": "https://ubuntu.com/security/notices/USN-4904-1"
},
{
"published_at": null,
"title": "Bulletin de s\u00e9curit\u00e9 Ubuntu USN-4910-1 du 13 avril 2021",
"url": "https://ubuntu.com/security/notices/USN-4910-1"
},
{
"published_at": null,
"title": "Bulletin de s\u00e9curit\u00e9 Ubuntu USN-4907-1 du 13 avril 2021",
"url": "https://ubuntu.com/security/notices/USN-4907-1"
},
{
"published_at": null,
"title": "Bulletin de s\u00e9curit\u00e9 Ubuntu USN-4911-1 du 13 avril 2021",
"url": "https://ubuntu.com/security/notices/USN-4911-1"
},
{
"published_at": null,
"title": "Bulletin de s\u00e9curit\u00e9 Ubuntu USN-4909-1 du 13 avril 2021",
"url": "https://ubuntu.com/security/notices/USN-4909-1"
}
]
}
CVE-2021-20261 (GCVE-0-2021-20261)
Vulnerability from cvelistv5 – Published: 2021-03-11 20:10 – Updated: 2024-08-03 17:37
VLAI
EPSS
Summary
A race condition was found in the Linux kernels implementation of the floppy disk drive controller driver software. The impact of this issue is lessened by the fact that the default permissions on the floppy device (/dev/fd0) are restricted to root. If the permissions on the device have changed the impact changes greatly. In the default configuration root (or equivalent) permissions are required to attack this flaw.
Severity
No CVSS data available.
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=1932150 | x_refsource_MISC |
| https://git.kernel.org/pub/scm/linux/kernel/git/t… | x_refsource_MISC |
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CVE-2021-20268 (GCVE-0-2021-20268)
Vulnerability from cvelistv5 – Published: 2021-03-09 17:16 – Updated: 2024-08-03 17:37
VLAI
EPSS
Summary
An out-of-bounds access flaw was found in the Linux kernel's implementation of the eBPF code verifier in the way a user running the eBPF script calls dev_map_init_map or sock_map_alloc. This flaw allows a local user to crash the system or possibly escalate their privileges. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
Severity
No CVSS data available.
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=1923816 | x_refsource_MISC |
| https://lore.kernel.org/bpf/CACAyw99bEYWJCSGqfLiJ… | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2021040… | x_refsource_CONFIRM |
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CVE-2021-26930 (GCVE-0-2021-26930)
Vulnerability from cvelistv5 – Published: 2021-02-17 00:00 – Updated: 2024-08-03 20:33
VLAI
EPSS
Summary
An issue was discovered in the Linux kernel 3.11 through 5.10.16, as used by Xen. To service requests to the PV backend, the driver maps grant references provided by the frontend. In this process, errors may be encountered. In one case, an error encountered earlier might be discarded by later processing, resulting in the caller assuming successful mapping, and hence subsequent operations trying to access space that wasn't mapped. In another case, internal state would be insufficiently updated, preventing safe recovery from the error. This affects drivers/block/xen-blkback/blkback.c.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
7 references
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CVE-2021-26931 (GCVE-0-2021-26931)
Vulnerability from cvelistv5 – Published: 2021-02-17 00:00 – Updated: 2024-08-03 20:33
VLAI
EPSS
Summary
An issue was discovered in the Linux kernel 2.6.39 through 5.10.16, as used in Xen. Block, net, and SCSI backends consider certain errors a plain bug, deliberately causing a kernel crash. For errors potentially being at least under the influence of guests (such as out of memory conditions), it isn't correct to assume a plain bug. Memory allocations potentially causing such crashes occur only when Linux is running in PV mode, though. This affects drivers/block/xen-blkback/blkback.c and drivers/xen/xen-scsiback.c.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
9 references
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CVE-2021-28038 (GCVE-0-2021-28038)
Vulnerability from cvelistv5 – Published: 2021-03-05 00:00 – Updated: 2024-08-03 21:33
VLAI
EPSS
Summary
An issue was discovered in the Linux kernel through 5.11.3, as used with Xen PV. A certain part of the netback driver lacks necessary treatment of errors such as failed memory allocations (as a result of changes to the handling of grant mapping errors). A host OS denial of service may occur during misbehavior of a networking frontend driver. NOTE: this issue exists because of an incomplete fix for CVE-2021-26931.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
6 references
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CVE-2021-28375 (GCVE-0-2021-28375)
Vulnerability from cvelistv5 – Published: 2021-03-15 04:51 – Updated: 2024-08-03 21:40
VLAI
EPSS
Summary
An issue was discovered in the Linux kernel through 5.11.6. fastrpc_internal_invoke in drivers/misc/fastrpc.c does not prevent user applications from sending kernel RPC messages, aka CID-20c40794eb85. This is a related issue to CVE-2019-2308.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
6 references
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| https://git.kernel.org/linus/20c40794eb85ea29852d… | x_refsource_MISC |
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| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://security.netapp.com/advisory/ntap-2021040… | x_refsource_CONFIRM |
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CVE-2021-28950 (GCVE-0-2021-28950)
Vulnerability from cvelistv5 – Published: 2021-03-20 19:55 – Updated: 2024-08-03 21:55
VLAI
EPSS
Summary
An issue was discovered in fs/fuse/fuse_i.h in the Linux kernel before 5.11.8. A "stall on CPU" can occur because a retry loop continually finds the same bad inode, aka CID-775c5033a0d1.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://git.kernel.org/pub/scm/linux/kernel/git/t… | x_refsource_MISC |
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| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.debian.org/debian-lts-announce/2021… | mailing-listx_refsource_MLIST |
| https://lists.debian.org/debian-lts-announce/2022… | mailing-listx_refsource_MLIST |
| https://www.debian.org/security/2022/dsa-5096 | vendor-advisoryx_refsource_DEBIAN |
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CVE-2021-29154 (GCVE-0-2021-29154)
Vulnerability from cvelistv5 – Published: 2021-04-08 00:00 – Updated: 2024-08-03 22:02
VLAI
EPSS
Summary
BPF JIT compilers in the Linux kernel through 5.11.12 have incorrect computation of branch displacements, allowing them to execute arbitrary code within the kernel context. This affects arch/x86/net/bpf_jit_comp.c and arch/x86/net/bpf_jit_comp32.c.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
10 references
Date Public
2021-04-08 00:00
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CVE-2021-3178 (GCVE-0-2021-3178)
Vulnerability from cvelistv5 – Published: 2021-01-19 06:44 – Updated: 2024-08-03 16:45 Disputed
VLAI
EPSS
Summary
fs/nfsd/nfs3xdr.c in the Linux kernel through 5.10.8, when there is an NFS export of a subdirectory of a filesystem, allows remote attackers to traverse to other parts of the filesystem via READDIRPLUS. NOTE: some parties argue that such a subdirectory export is not intended to prevent this attack; see also the exports(5) no_subtree_check default behavior
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://patchwork.kernel.org/project/linux-nfs/pa… | x_refsource_MISC |
| https://git.kernel.org/pub/scm/linux/kernel/git/t… | x_refsource_MISC |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.debian.org/debian-lts-announce/2021… | mailing-listx_refsource_MLIST |
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CVE-2021-3347 (GCVE-0-2021-3347)
Vulnerability from cvelistv5 – Published: 2021-01-29 16:56 – Updated: 2026-02-25 17:10
VLAI
EPSS
Summary
An issue was discovered in the Linux kernel through 5.10.11. PI futexes have a kernel stack use-after-free during fault handling, allowing local users to execute code in the kernel, aka CID-34b1a1ce1458.
Severity
7.8 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-416 - Use After Free
Assigner
References
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Trend slope:
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(linear fit over daily sighting counts)
Show additional events:
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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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