rhsa-2022_0629
Vulnerability from csaf_redhat
Published
2022-02-22 15:18
Modified
2024-11-15 10:48
Summary
Red Hat Security Advisory: kernel-rt security and bug fix update
Notes
Topic
An update for kernel-rt is now available for Red Hat Enterprise Linux 8.2 Extended Update Support.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
Security Fix(es):
* kernel: Use After Free in unix_gc() which could result in a local privilege escalation (CVE-2021-0920)
* kernel: use-after-free in RDMA listen() (CVE-2021-4028)
* kernel: xfs: raw block device data leak in XFS_IOC_ALLOCSP IOCTL (CVE-2021-4155)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Bug Fix(es):
* kernnel-rt-debug: do not call blocking ops when !TASK_RUNNING; state=1 set at [<0000000050e86018>] handle_userfault+0x530/0x1820 (BZ#2029420)
* kernel-rt: update RT source tree to the latest RHEL-8.2.z15 Batch (BZ#2046275)
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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"url": "https://access.redhat.com/errata/RHSA-2022:0629"
},
{
"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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"attackVector": "LOCAL",
"availabilityImpact": "NONE",
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"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",
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],
"title": "kernel: xfs: raw block device data leak in XFS_IOC_ALLOCSP IOCTL"
}
]
}
Loading...
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.