The do_block_io_op function in (1) drivers/xen/blkback/blkback.c and (2)…
Priority LOW 26CWE-20Published · Updated
Key facts
- Attack vector
- Adjacent network
- Privileges required
- Low
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Complete
- Fix status
- Fixed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat.
Summary
The do_block_io_op function in (1) drivers/xen/blkback/blkback.c and (2) drivers/xen/blktap/blktap.c in Xen before 3.4.0 for the Linux kernel 2.6.18, and possibly other versions, allows guest OS users to cause a denial of service (infinite loop and CPU consumption) via a large production request index to the blkback or blktap back-end drivers. NOTE: some of these details are obtained from third party information.
Why it matters now
EPSS 0.00725 54th percentileScored 2026-11-07
Fix Fixed Red Hat: 1 advisory
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 13
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:citrix:xen:*:*:*:*:*:*:*:* | up to 3.3.2 | Vulnerable | Citrix |
| cpe:2.3:a:citrix:xen:3.0.2:*:*:*:*:*:*:* | 3.0.2 | Vulnerable | Citrix |
| cpe:2.3:a:citrix:xen:3.0.3:*:*:*:*:*:*:* | 3.0.3 | Vulnerable | Citrix |
| cpe:2.3:a:citrix:xen:3.0.4:*:*:*:*:*:*:* | 3.0.4 | Vulnerable | Citrix |
| cpe:2.3:a:citrix:xen:3.1.3:*:*:*:*:*:*:* | 3.1.3 | Vulnerable | Citrix |
| cpe:2.3:a:citrix:xen:3.1.4:*:*:*:*:*:*:* | 3.1.4 | Vulnerable | Citrix |
| cpe:2.3:a:citrix:xen:3.2.0:*:*:*:*:*:*:* | 3.2.0 | Vulnerable | Citrix |
| cpe:2.3:a:citrix:xen:3.2.1:*:*:*:*:*:*:* | 3.2.1 | Vulnerable | Citrix |
| cpe:2.3:a:citrix:xen:3.2.2:*:*:*:*:*:*:* | 3.2.2 | Vulnerable | Citrix |
| cpe:2.3:a:citrix:xen:3.2.3:*:*:*:*:*:*:* | 3.2.3 | Vulnerable | Citrix |
- cpe:2.3:a:citrix:xen:*:*:*:*:*:*:*:* Versions up to 3.3.2 Vulnerable ·Citrix
- cpe:2.3:a:citrix:xen:3.0.2:*:*:*:*:*:*:* Versions 3.0.2 Vulnerable ·Citrix
- cpe:2.3:a:citrix:xen:3.0.3:*:*:*:*:*:*:* Versions 3.0.3 Vulnerable ·Citrix
- cpe:2.3:a:citrix:xen:3.0.4:*:*:*:*:*:*:* Versions 3.0.4 Vulnerable ·Citrix
- cpe:2.3:a:citrix:xen:3.1.3:*:*:*:*:*:*:* Versions 3.1.3 Vulnerable ·Citrix
- cpe:2.3:a:citrix:xen:3.1.4:*:*:*:*:*:*:* Versions 3.1.4 Vulnerable ·Citrix
- cpe:2.3:a:citrix:xen:3.2.0:*:*:*:*:*:*:* Versions 3.2.0 Vulnerable ·Citrix
- cpe:2.3:a:citrix:xen:3.2.1:*:*:*:*:*:*:* Versions 3.2.1 Vulnerable ·Citrix
- cpe:2.3:a:citrix:xen:3.2.2:*:*:*:*:*:*:* Versions 3.2.2 Vulnerable ·Citrix
- cpe:2.3:a:citrix:xen:3.2.3:*:*:*:*:*:*:* Versions 3.2.3 Vulnerable ·Citrix
Remediation
Red Hat 1 advisory
- RHSA-2011:0004 Released 2011-01-04 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- Red Hat Enterprise Linux (v. 5 server) kernel-2.6.18-194.32.1.el5, kernel-2.6.18-194.32.1.el5.ia64, kernel-PAE-2.6.18-194.32.1.el5 +18
- Red Hat Enterprise Linux Desktop (v. 5 client) kernel-2.6.18-194.32.1.el5, kernel-PAE-2.6.18-194.32.1.el5, kernel-PAE-devel-2.6.18-194.32.1.el5 +8
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux (v. 5 server) | Fixed | RHSA-2011:0004 |
| Red Hat Enterprise Linux Desktop (v. 5 client) | Fixed | RHSA-2011:0004 |
Timeline
- 2026-10-02 Threatist record created from CVE-2010-4247
- 2026-10-03 Alias added: GHSA-9hwc-j324-r98v
References
Patch 5
- https://bugzilla.redhat.com/show_bug.cgi?id=656206
- http://xenbits.xensource.com/linux-2.6.18-xen.hg?rev/77f831cbb91d
- [oss-security] 20101123 CVE request: xen: request-processing loop is unbounded in blkback
- http://xenbits.xensource.com/linux-2.6.18-xen.hg?rev/7070d34f251c
- [oss-security] 20101124 Re: CVE request: xen: request-processing loop is unbounded in blkback
Advisory 1
More Citrix Xen vulnerabilities
- TI-2011-01674 Xen 4.1 before 4.1.1 and 4.0 before 4.0.2, when using PCI passthrough on Intel VT-d… CVSS 2.0HIGH 7.4
- TI-2008-04202 xend in Xen 3.0.3 does not properly limit the contents of the /local/domain xenstore… CVSS 2.0HIGH 7.2
- TI-2011-01402 Multiple integer overflows in tools/libxc/xc_dom_bzimageloader.c in Xen 3.2, 3.3, 4.0… CVSS 2.0MEDIUM 6.9
- TI-2008-05424 xend in Xen 3.3.0 does not properly restrict a guest VM's write access within the… CVSS 2.0HIGH 7.2
- TI-2010-04004 The fixup_page_fault function in arch/x86/traps.c in Xen 4.0.1 and earlier on 64-bit… CVSS 2.0MEDIUM 6.1
- TI-2010-03988 The vbd_create function in Xen 3.1.2, when the Linux kernel 2.6.18 on Red Hat Enterprise… CVSS 2.0MEDIUM 5.5
Sources
- CVE-2010-4247 · CVE Program
- CVE-2010-4247 · NVD
- FIRST EPSS
- GHSA-9hwc-j324-r98v · GitHub Advisory Database · CC BY 4.0
- CVE-2010-4247 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences