RHSA-2022:1417
Vulnerability from csaf_redhat - Published: 2022-04-19 16:19 - Updated: 2026-03-02 16:19A flaw was found in the Linux kernel. A logic error in eventpoll.c can cause a use-after-free, leading to a local escalation of privilege with no additional execution privileges. User interaction is not needed for exploitation. The highest threat from this vulnerability is to confidentiality, integrity as well as system availability.
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| Unresolved product id: 6Server-ELS:kernel-0:2.6.32-754.47.1.el6.i686 | — |
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A vulnerability was found in unix_dgram_recvmsg in net/unix/af_unix.c in the Linux kernel's garbage collection for Unix domain socket file handlers. In this flaw, a missing cleanup may lead to a use-after-free due to a race problem. This flaw allows a local user to crash the system or escalate their privileges on the system. A read-after-free memory flaw was found in the Linux kernel's garbage collection for Unix domain socket file handlers in the way users call close() and fget() simultaneously and can potentially trigger a race condition. This flaw allows a local user to crash the system or escalate their privileges on the system.
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| Unresolved product id: 6Server-ELS:kernel-0:2.6.32-754.47.1.el6.i686 | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-debuginfo-common-s390x-0:2.6.32-754.47.1.el6.s390x | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-debuginfo-common-x86_64-0:2.6.32-754.47.1.el6.x86_64 | — |
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A data leak flaw was found in the way XFS_IOC_ALLOCSP IOCTL in the XFS filesystem allowed for size increase of files with unaligned size. A local attacker could use this flaw to leak data on the XFS filesystem otherwise not accessible to them.
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 6Server-ELS:kernel-0:2.6.32-754.47.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS:kernel-debuginfo-common-x86_64-0:2.6.32-754.47.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-ELS:kernel-devel-0:2.6.32-754.47.1.el6.i686 | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-0:2.6.32-754.47.1.el6.i686 | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-debug-0:2.6.32-754.47.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-debug-devel-0:2.6.32-754.47.1.el6.i686 | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-debuginfo-common-s390x-0:2.6.32-754.47.1.el6.s390x | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-debuginfo-common-x86_64-0:2.6.32-754.47.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-devel-0:2.6.32-754.47.1.el6.i686 | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-kdump-debuginfo-0:2.6.32-754.47.1.el6.s390x | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-kdump-devel-0:2.6.32-754.47.1.el6.s390x | — |
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| Unresolved product id: 6Server-optional-ELS:python-perf-debuginfo-0:2.6.32-754.47.1.el6.x86_64 | — |
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A vulnerability was found in the Linux kernel’s cgroup_release_agent_write in the kernel/cgroup/cgroup-v1.c function. This flaw, under certain circumstances, allows the use of the cgroups v1 release_agent feature to escalate privileges and bypass the namespace isolation unexpectedly.
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 6Server-ELS:kernel-0:2.6.32-754.47.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS:kernel-0:2.6.32-754.47.1.el6.src | — |
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| Unresolved product id: 6Server-ELS:kernel-0:2.6.32-754.47.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-0:2.6.32-754.47.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-0:2.6.32-754.47.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-0:2.6.32-754.47.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-debuginfo-0:2.6.32-754.47.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-debuginfo-0:2.6.32-754.47.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-debuginfo-0:2.6.32-754.47.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-devel-0:2.6.32-754.47.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS:kernel-debuginfo-0:2.6.32-754.47.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS:kernel-debuginfo-0:2.6.32-754.47.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-ELS:kernel-debuginfo-common-i686-0:2.6.32-754.47.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS:kernel-debuginfo-common-s390x-0:2.6.32-754.47.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS:kernel-debuginfo-common-x86_64-0:2.6.32-754.47.1.el6.x86_64 | — |
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"text": "1920480"
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{
"category": "description",
"text": "A flaw was found in the Linux kernel. A logic error in eventpoll.c can cause a use-after-free, leading to a local escalation of privilege with no additional execution privileges. User interaction is not needed for exploitation. The highest threat from this vulnerability is to confidentiality, integrity as well as system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: use after free in eventpoll.c may lead to escalation of privilege",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"date": "2022-04-19T16:19:00+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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{
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"integrityImpact": "HIGH",
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"scope": "UNCHANGED",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"title": "kernel: use after free in eventpoll.c may lead to escalation of privilege"
},
{
"cve": "CVE-2021-0920",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2021-12-13T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2031930"
}
],
"notes": [
{
"category": "description",
"text": "A vulnerability was found in unix_dgram_recvmsg in net/unix/af_unix.c in the Linux kernel\u0027s garbage collection for Unix domain socket file handlers. In this flaw, a missing cleanup may lead to a use-after-free due to a race problem. This flaw allows a local user to crash the system or escalate their privileges on the system.\r\n\r\nA read-after-free memory flaw was found in the Linux kernel\u0027s garbage collection for Unix domain socket file handlers in the way users call close() and fget() simultaneously and can potentially trigger a race condition. This flaw allows a local user to crash the system or escalate their privileges on the system.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Use After Free in unix_gc() which could result in a local privilege escalation",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2021-0920"
},
{
"category": "external",
"summary": "RHBZ#2031930",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2031930"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2021-0920",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-0920"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-0920",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-0920"
},
{
"category": "external",
"summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cbcf01128d0a92e131bd09f1688fe032480b65ca",
"url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cbcf01128d0a92e131bd09f1688fe032480b65ca"
},
{
"category": "external",
"summary": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
}
],
"release_date": "2021-07-28T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2022-04-19T16:19:00+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
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"details": "CISA: https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
},
{
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"title": "kernel: Use After Free in unix_gc() which could result in a local privilege escalation"
},
{
"acknowledgments": [
{
"names": [
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"organization": "Virtuozzo Kernel team"
}
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"cwe": {
"id": "CWE-131",
"name": "Incorrect Calculation of Buffer Size"
},
"discovery_date": "2021-12-18T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2034813"
}
],
"notes": [
{
"category": "description",
"text": "A data leak flaw was found in the way XFS_IOC_ALLOCSP IOCTL in the XFS filesystem allowed for size increase of files with unaligned size. A local attacker could use this flaw to leak data on the XFS filesystem otherwise not accessible to them.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: xfs: raw block device data leak in XFS_IOC_ALLOCSP IOCTL",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2021-4155"
},
{
"category": "external",
"summary": "RHBZ#2034813",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2034813"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2021-4155",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-4155"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-4155",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-4155"
},
{
"category": "external",
"summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=983d8e60f50806f90534cc5373d0ce867e5aaf79",
"url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=983d8e60f50806f90534cc5373d0ce867e5aaf79"
}
],
"release_date": "2022-01-10T06:36:00+00:00",
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{
"category": "vendor_fix",
"date": "2022-04-19T16:19:00+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"url": "https://access.redhat.com/errata/RHSA-2022:1417"
},
{
"category": "workaround",
"details": "This issue can be mitigated by ensuring xfs_alloc_file_space is not called with \"0\" as an argument.\n\nThis can be done with a SystemTap script (which resets \"0\" with XFS_BMAPI_PREALLOC), below are the steps:\n\n1) Save the following script in a \u0027CVE-2021-4155.stp\u0027 file\n\n--- On Red Hat Enterprise Linux 6 ---\nprobe module(\"xfs\").function(\"xfs_alloc_file_space\") {\n\tif ($alloc_type == 0)\n\t\t$alloc_type = 0x40;\t# XFS_BMAPI_PREALLOC\n}\n--- On Red Hat Enterprise Linux 6 ---\n\n--- On Red Hat Enterprise Linux 7 onwards ---\nprobe module(\"xfs\").function(\"xfs_alloc_file_space\") {\n\tif ($alloc_type == 0)\n\t\t$alloc_type = 0x8;\t# XFS_BMAPI_PREALLOC\n}\n--- On Red Hat Enterprise Linux 7 onwards ---\n\n2) Install systemtap package and its dependencies\n\n # yum install -y systemtap systemtap-runtime\n # yum install -y kernel-devel kernel-debuginfo\n\n3) Build the mitigation kernel module as root.\n\n # stap -r `uname -r` -m cve_2021_4155.ko -g CVE-2021-4155.stp -p4\n\n4) Load the mitigation module as root\n\n # staprun -L cve_2021_4155.ko\n\n\n\nWhat is SystemTap and how to use it?\nhttps://access.redhat.com/solutions/5441",
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],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: xfs: raw block device data leak in XFS_IOC_ALLOCSP IOCTL"
},
{
"acknowledgments": [
{
"names": [
"Yiqi Sun"
],
"organization": "Nebula Lab"
},
{
"names": [
"Kevin Wang"
],
"organization": "Huawei"
}
],
"cve": "CVE-2022-0492",
"cwe": {
"id": "CWE-862",
"name": "Missing Authorization"
},
"discovery_date": "2022-02-07T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2051505"
}
],
"notes": [
{
"category": "description",
"text": "A vulnerability was found in the Linux kernel\u2019s cgroup_release_agent_write in the kernel/cgroup/cgroup-v1.c function. This flaw, under certain circumstances, allows the use of the cgroups v1 release_agent feature to escalate privileges and bypass the namespace isolation unexpectedly.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: cgroups v1 release_agent feature may allow privilege escalation",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "In the OpenShift Container Platform (OCP) the container escape and privilege escalation caused by the CVE-2022-0492 vulnerability are blocked by the SELinux policy enabled (by default) on the OCP cluster nodes.\n\nRed Hat Virtualization requires SELinux running in enforcing mode[1] on all hypervisors and managers, which blocks this vulnerability.\n\n1. https://access.redhat.com/solutions/499473",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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{
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{
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},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2022-0492",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-0492"
},
{
"category": "external",
"summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=24f6008564183aa120d07c03d9289519c2fe02af",
"url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=24f6008564183aa120d07c03d9289519c2fe02af"
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{
"category": "vendor_fix",
"date": "2022-04-19T16:19:00+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: cgroups v1 release_agent feature may allow privilege escalation"
}
]
}
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.