CVE-2010-4255

medium

Published 2011-01-25 · Modified 2026-04-29

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CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

6.1

Description

The fixup_page_fault function in arch/x86/traps.c in Xen 4.0.1 and earlier on 64-bit platforms, when paravirtualization is enabled, does not verify that kernel mode is used to call the handle_gdt_ldt_mapping_fault function, which allows guest OS users to cause a denial of service (host OS BUG_ON) via a crafted memory access.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`4.0.1-2`
sid	Fixed	`4.0.1-2`
forky	Fixed	`4.0.1-2`
bullseye	Fixed	`4.0.1-2`
bookworm	Fixed	`4.0.1-2`

Application impact

Vendor	Product	Versions
citrix	xen	`{"endIncluding":"4.0.1"}`
citrix	xen	`3.0.2`
citrix	xen	`3.0.3`
citrix	xen	`3.0.4`
citrix	xen	`3.1.2`
citrix	xen	`3.1.3`
citrix	xen	`3.1.4`
citrix	xen	`3.2.0`
citrix	xen	`3.2.1`
citrix	xen	`3.2.2`
citrix	xen	`3.2.3`
citrix	xen	`3.3.0`
citrix	xen	`3.3.1`
citrix	xen	`3.3.2`
citrix	xen	`3.4.0`
citrix	xen	`3.4.1`
citrix	xen	`3.4.2`
citrix	xen	`3.4.3`
citrix	xen	`4.0.0`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.