Vulnerability-Lookup

ALSA-2021:5227

Vulnerability from osv_almalinux – Published: 2021-12-21 09:07 – Updated: 2023-09-15 13:41 – Source website

Summary

Moderate: kernel security and bug fix update

Details

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

kernel: In Overlayfs missing a check for a negative dentry before calling vfs_rename() (CVE-2021-20321)

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):

panic while breaking a lease/delegation after user mode helper invocation (BZ#2010333)
The ASR driver is causing a system crash in AlmaLinux8.4 compared to AlmaLinux8.3 due to kernel changes (BZ#2016384)
AlmaLinux8: DFS provided SMB shares are not accessible following unprivileged access (BZ#2017177)
Avoid hitting the rtnl_trylock/restart_syscall logic in net-sysfs when possible (BZ#2021165)
AlmaLinux8: x86/Kconfig: Do not enable AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT (BZ#2024678)
AlmaLinux8.4-[Regression][P10][DD2.0][Rainier/Denali] - system crashed while offlining and onlining cores (BZ#2026450)

References

URL

Type

https://vulners.com/cve/CVE-2021-20321

REPORT

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "kernel-tools-libs-devel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.18.0-348.7.1.el8_5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "The kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* kernel: In Overlayfs missing a check for a negative dentry before calling vfs_rename() (CVE-2021-20321)\n\nFor 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.\n\nBug Fix(es):\n\n* panic while breaking a lease/delegation after user mode helper invocation (BZ#2010333)\n\n* The ASR driver is causing a system crash in AlmaLinux8.4 compared to AlmaLinux8.3 due to kernel changes (BZ#2016384)\n\n* AlmaLinux8: DFS provided SMB shares are not accessible following unprivileged access (BZ#2017177)\n\n* Avoid hitting the rtnl_trylock/restart_syscall logic in net-sysfs when possible (BZ#2021165)\n\n* AlmaLinux8: x86/Kconfig: Do not enable AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT (BZ#2024678)\n\n* AlmaLinux8.4-[Regression][P10][DD2.0][Rainier/Denali] - system crashed while offlining and onlining cores (BZ#2026450)",
  "id": "ALSA-2021:5227",
  "modified": "2023-09-15T13:41:48Z",
  "published": "2021-12-21T09:07:34Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://vulners.com/cve/CVE-2021-20321"
    }
  ],
  "related": [
    "CVE-2021-20321"
  ],
  "summary": "Moderate: kernel security and bug fix update"
}

CVE-2021-20321 (GCVE-0-2021-20321)

Vulnerability from cvelistv5 – Published: 2022-02-18 17:50 – Updated: 2024-08-03 17:37

Summary

A race condition accessing file object in the Linux kernel OverlayFS subsystem was found in the way users do rename in specific way with OverlayFS. A local user could use this flaw to crash the system.

Severity

No CVSS data available.

CWE

CWE-362

Assigner

redhat redhat root Scorecard

References

4 references

URL	Tags
https://bugzilla.redhat.com/show_bug.cgi?id=2013242	x_refsource_MISC
https://lore.kernel.org/all/20211011134508.748956…	x_refsource_MISC
https://lists.debian.org/debian-lts-announce/2022…	mailing-listx_refsource_MLIST
https://www.debian.org/security/2022/dsa-5096	vendor-advisoryx_refsource_DEBIAN

Impacted products

1 product

Vendor	Product	Version
n/a	kernel	Affected: kernel 5.15-rc5

Show details on NVD website

JSON

To clipboard

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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.

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.

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.

Action not permitted

ALSA-2021:5227

CVE-2021-20321 (GCVE-0-2021-20321)

Tags

Sightings

Nomenclature

Related by attack behaviour