CVE-2012-3495
published 2012-11-23CVE-2012-3495: The physdev_get_free_pirq hypercall in arch/x86/physdev.c in Xen 4.1.x and Citrix XenServer 6.0.2 and earlier uses the return value of the get_free_pirq…
PriorityP419medium6.1CVSS 2.0
AVLACLAuNCPIPAC
EPSS
0.44%
37.1th percentile
The physdev_get_free_pirq hypercall in arch/x86/physdev.c in Xen 4.1.x and Citrix XenServer 6.0.2 and earlier uses the return value of the get_free_pirq function as an array index without checking that the return value indicates an error, which allows guest OS users to cause a denial of service (invalid memory write and host crash) and possibly gain privileges via unspecified vectors.
Affected
21 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| citrix | citrix_adm | — | — |
| citrix | citrix_hypervisor | — | — |
| citrix | citrix_virtual_apps_and_desktops | — | — |
| citrix | endpoint_management | — | — |
| citrix | netscaler_adc | — | — |
| citrix | netscaler_gateway | — | — |
| citrix | xenserver | <= 6.0.2 | — |
| citrix | xenserver | — | — |
| citrix | xenserver | — | — |
| citrix | xenserver | — | — |
| citrix | xenserver | — | — |
| citrix | xenserver | — | — |
| debian | xen | < xen 4.1.3-2 (bookworm) | xen 4.1.3-2 (bookworm) |
| xen | xen | — | — |
| xen | xen | — | — |
| xen | xen | — | — |
| xen | xen | — | — |
| xen | xen | >= 0 < 4.1.3-2 | 4.1.3-2 |
| xen | xen | >= 0 < 4.1.3-2 | 4.1.3-2 |
| xen | xen | >= 0 < 4.1.3-2 | 4.1.3-2 |
| xen | xen | >= 0 < 4.1.3-2 | 4.1.3-2 |
CVSS provenance
nvdv2.06.1MEDIUMAV:L/AC:L/Au:N/C:P/I:P/A:C
osv6.1MEDIUM
vendor_debian6.1MEDIUM
vendor_redhat6.1MEDIUM
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Citrix
CVE-2012-3495: The physdev_get_free_pirq hypercall in arch/x86/physdev.c in Xen 4.1.x and Citrix XenServer 6.0.2 and earlier uses the return value of the get_free_pi
vendor_citrix·2012-11-23·CVSS 6.1
CVE-2012-3495 [MEDIUM] CWE-20 CVE-2012-3495: The physdev_get_free_pirq hypercall in arch/x86/physdev.c in Xen 4.1.x and Citrix XenServer 6.0.2 and earlier uses the return value of the get_free_pi
CVE-2012-3495: The physdev_get_free_pirq hypercall in arch/x86/physdev.c in Xen 4.1.x and Citrix XenServer 6.0.2 and earlier uses the return value of the get_free_pirq function as an array index without checking that the return value indicates an error, which allows guest OS users to cause a denial of service (invalid memory write and host crash) and possibly gain privileges via unspecified vectors.
Red Hat
kernel: xen: hypercall physdev_get_free_pirq vulnerability
vendor_redhat·2012-09-05·CVSS 6.1
CVE-2012-3495 [MEDIUM] kernel: xen: hypercall physdev_get_free_pirq vulnerability
kernel: xen: hypercall physdev_get_free_pirq vulnerability
The physdev_get_free_pirq hypercall in arch/x86/physdev.c in Xen 4.1.x and Citrix XenServer 6.0.2 and earlier uses the return value of the get_free_pirq function as an array index without checking that the return value indicates an error, which allows guest OS users to cause a denial of service (invalid memory write and host crash) and possibly gain privileges via unspecified vectors.
Statement: Not vulnerable.
This issue did not affect the versions of the kernel-xen package as shipped with Red Hat Enterprise Linux 5.
This issue did not affect Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG as we did not have support for Xen hypervisor.
Package: kernel-xen (Red Hat Enterprise Linux 5) - Not affected
Debian
CVE-2012-3495: xen - The physdev_get_free_pirq hypercall in arch/x86/physdev.c in Xen 4.1.x and Citri...
vendor_debian·2012·CVSS 6.1
CVE-2012-3495 [MEDIUM] CVE-2012-3495: xen - The physdev_get_free_pirq hypercall in arch/x86/physdev.c in Xen 4.1.x and Citri...
The physdev_get_free_pirq hypercall in arch/x86/physdev.c in Xen 4.1.x and Citrix XenServer 6.0.2 and earlier uses the return value of the get_free_pirq function as an array index without checking that the return value indicates an error, which allows guest OS users to cause a denial of service (invalid memory write and host crash) and possibly gain privileges via unspecified vectors.
Scope: local
bookworm: resolved (fixed in 4.1.3-2)
bullseye: resolved (fixed in 4.1.3-2)
forky: resolved (fixed in 4.1.3-2)
sid: resolved (fixed in 4.1.3-2)
trixie: resolved (fixed in 4.1.3-2)
Citrix
Citrix Security Bulletin CTX134708
vendor_citrix·CVSS 2.1
CVE-2012-3494 [LOW] Citrix Security Bulletin CTX134708
Citrix Security Bulletin CTX134708
CVE References: CVE-2012-3494, CVE-2012-3495, CVE-2012-3496, CVE-2012-3498, CVE-2012-3516, CVE-2025-12101, CVE-2025-62626, CVE-2026-23554, CVE-2026-3055, CVE-2026-4368, CVE-2026-4397
Affected Products: Citrix ADM, Citrix Hypervisor, Citrix Virtual Apps and Desktops, Endpoint Management, NetScaler ADC, NetScaler Gateway, XenServer
GHSA
GHSA-w2q9-w27j-m384: The physdev_get_free_pirq hypercall in arch/x86/physdev
ghsa_unreviewed·2022-05-17
CVE-2012-3495 [MEDIUM] CWE-20 GHSA-w2q9-w27j-m384: The physdev_get_free_pirq hypercall in arch/x86/physdev
The physdev_get_free_pirq hypercall in arch/x86/physdev.c in Xen 4.1.x and Citrix XenServer 6.0.2 and earlier uses the return value of the get_free_pirq function as an array index without checking that the return value indicates an error, which allows guest OS users to cause a denial of service (invalid memory write and host crash) and possibly gain privileges via unspecified vectors.
OSV
CVE-2012-3495: The physdev_get_free_pirq hypercall in arch/x86/physdev
osv·2012-11-23·CVSS 6.1
CVE-2012-3495 [MEDIUM] CVE-2012-3495: The physdev_get_free_pirq hypercall in arch/x86/physdev
The physdev_get_free_pirq hypercall in arch/x86/physdev.c in Xen 4.1.x and Citrix XenServer 6.0.2 and earlier uses the return value of the get_free_pirq function as an array index without checking that the return value indicates an error, which allows guest OS users to cause a denial of service (invalid memory write and host crash) and possibly gain privileges via unspecified vectors.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2012-3495 kernel: xen: hypercall physdev_get_free_pirq vulnerability [fedora-all]
bugzilla·2012-09-05·CVSS 6.1
CVE-2012-3495 [MEDIUM] CVE-2012-3495 kernel: xen: hypercall physdev_get_free_pirq vulnerability [fedora-all]
CVE-2012-3495 kernel: xen: hypercall physdev_get_free_pirq vulnerability [fedora-all]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected Fedora
versions.
For comments that are specific to the vulnerability please use bugs filed
against "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When creating a Bodhi update request, please include this bug ID and the
bug IDs of this bug's parent bugs filed against the "Security Response"
product (the top-level CVE bugs). Please mention the CVE IDs being fixed
in the RPM changelog when available.
Bodhi update submission link:
https://admin.fedoraproject.org/updates/new/?type
Bugzilla
CVE-2012-3495 kernel: xen: hypercall physdev_get_free_pirq vulnerability
bugzilla·2012-08-23·CVSS 6.1
CVE-2012-3495 [MEDIUM] CVE-2012-3495 kernel: xen: hypercall physdev_get_free_pirq vulnerability
CVE-2012-3495 kernel: xen: hypercall physdev_get_free_pirq vulnerability
PHYSDEVOP_get_free_pirq does not check that its call to get_free_pirq succeeded, and if it fails will use the error code as an array index.
A malicious guest might be able to cause the host to crash, leading to a DoS, depending on the exact memory layout. Privilege escalation is a theoretical possibility which cannot be ruled out, but is considered unlikely
Acknowledgements:
Red Hat would like to thank the Xen project for reporting this issue. Upstream acknowledges Matthew Daley as the original reporter.
Discussion:
Statement:
Not vulnerable.
This issue did not affect the versions of the kernel-xen package as shipped with Red Hat Enterprise Linux 5.
This issue did not affect Red Hat Enterprise Linux 6 and Red
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2012-11-23
Published