Read the docs
TI-2021-09754 Aliases CVE-2021-28688GHSA-hqhv-rx9w-cr56

The fix for XSA-365 includes initialization of pointers such that subsequent cleanup code…

Priority LOW 29CWE-665Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

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.

Why it matters now

EPSS 0.0034 27th percentileScored 2026-11-07
Fix Fixed Linux (Linux): next of 4.3, next of 5.9

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux3.11 and laternext of 4.3Patch availableCNA
LinuxLinux5.11.1—No fix listedCNA
LinuxLinux5.12-rc—No fix listedCNA
LinuxLinux5.10.18—No fix listedCNA
LinuxLinux—next of 5.9Patch availableCNA
  • Linux VendorLinux Affected 3.11 and later Fixed in next of 4.3 Patch available CNA
  • Linux VendorLinux Affected 5.11.1 Fixed in — No fix listed CNA
  • Linux VendorLinux Affected 5.12-rc Fixed in — No fix listed CNA
  • Linux VendorLinux Affected 5.10.18 Fixed in — No fix listed CNA
  • Linux VendorLinux Affected — Fixed in next of 5.9 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*3.11 – 5.10.18VulnerableLinux
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 3.11 – 5.10.18 Vulnerable ·Linux
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian

Remediation

  • Fix · CNA Linux (Linux) Fixed in next of 4.3
  • Fix · CNA Linux (Linux) Fixed in next of 5.9

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-28688
  2. 2026-10-03 Alias added: GHSA-hqhv-rx9w-cr56

References

Patch 1

Advisory 2

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences