CVE-2021-28688 (GCVE-0-2021-28688)

Vulnerability from cvelistv5 – Published: 2021-04-06 18:07 – Updated: 2024-08-03 21:47
VLAI
Summary
The fix for XSA-365 includes initialization of pointers such that subsequent cleanup code wouldn't use uninitialized or stale values. This initialization went too far and may under certain conditions also overwrite pointers which are in need of cleaning up. The lack of cleanup would result in leaking persistent grants. The leak in turn would prevent fully cleaning up after a respective guest has died, leaving around zombie domains. All Linux versions having the fix for XSA-365 applied are vulnerable. XSA-365 was classified to affect versions back to at least 3.11.
Severity
No CVSS data available.
CWE
  • unknown
Assigner
XEN
References
Impacted products
Vendor Product Version
Linux Linux Unknown: unspecified , < 4.12 (custom)
Affected: 3.11 , < unspecified (custom)
Unaffected: next of 4.3 , < unspecified (custom)
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Linux Linux Affected: 5.11.1
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Linux Linux Affected: 5.12-rc
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Linux Linux Affected: 5.10.18
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Linux Linux Unknown: unspecified , < 4.12 (custom)
Unknown: 4.4 , < unspecified (custom)
Unaffected: next of 5.9 , < unspecified (custom)
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Credits
{'credit_data': {'description': {'description_data': [{'lang': 'eng', 'value': 'This issue was discovered by Nicolai Stange of SUSE.'}]}}}
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Sightings

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  • 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.
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  • 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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