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CVE-2006-5755

Linux kernel before 2.6.18, when running on x86_64 systems, does not properly save or restore...

4.9 MediumFix available

Linux kernel before 2.6.18, when running on x86_64 systems, does not properly save or restore EFLAGS during a context switch, which allows local users to cause a denial of service (crash) by causing SYSENTER to set an NT flag, which can trigger a crash on the IRET of the next task.

Exploit likelihood

0.42%Down 1.1 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 4.9

Linux kernel before 2.6.18, when running on x86_64 systems, does not properly save or restore EFLAGS during a context switch, which allows local users to cause a denial of service (crash) by causing SYSENTER to set an NT flag, which can trigger a crash on the IRET of the next task.

Record
CVE-2006-5755
CVSS 2.0
4.9 MediumAV:L/AC:L/Au:N/C:N/I:N/A:C
Updated
2026-11-02
CVE List No score

Linux kernel before 2.6.18, when running on x86_64 systems, does not properly save or restore EFLAGS during a context switch, which allows local users to cause a denial of service (crash) by causing SYSENTER to set an NT flag, which can trigger a crash on the IRET of the next task.

Record
CVE-2006-5755
Updated
2026-11-02
EUVDEUVD-2006-5739 No score

Linux kernel before 2.6.18, when running on x86_64 systems, does not properly save or restore EFLAGS during a context switch, which allows local users to cause a denial of service (crash) by causing SYSENTER to set an NT flag, which can trigger a crash on the IRET of the next task.

Record
EUVD-2006-5739
Updated
2026-11-03
GitHub AdvisoriesGHSA-8cq2-mm8h-vjrv No score

Linux kernel before 2.6.18, when running on x86_64 systems, does not properly save or restore...

Linux kernel before 2.6.18, when running on x86_64 systems, does not properly save or restore EFLAGS during a context switch, which allows local users to cause a denial of service (crash) by causing SYSENTER to set an NT flag, which can trigger a crash on the IRET of the next task.

Record
GHSA-8cq2-mm8h-vjrv
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
linux-2.6
Debian:4.0
 before 2.6.18.dfsg.1-13etch4, plus listed versions
2.6.18.dfsg.1-122.6.18.dfsg.1-12etch12.6.18.dfsg.1-12etch22.6.18.dfsg.1-132.6.18.dfsg.1-13etch12.6.18.dfsg.1-13etch22.6.18.dfsg.1-13etch3
2.6.18.dfsg.1-13etch4
kernel
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-PAE
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-PAE-debuginfo
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-PAE-devel
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-debug
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-debug-debuginfo
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-debug-devel
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-debuginfo
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-debuginfo-common
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
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Affected packages
PackageAffectedFixed
kernel-devel
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-doc
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-headers
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-xen
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-xen-debuginfo
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-xen-devel
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-PAE
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-PAE-debuginfo
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-PAE-devel
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-debug
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-debug-debuginfo
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-debug-devel
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-debuginfo
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-debuginfo-common
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-devel
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-doc
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-headers
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-kdump
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-kdump-debuginfo
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-kdump-devel
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-xen
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-xen-debuginfo
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5
kernel-xen-devel
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-92.1.18.el5
0:2.6.18-92.1.18.el5

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2006-5755 is a medium vulnerability (CVSS 4.9) in Linux Kernel, published December 31, 2006. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.42%, the 36th percentile. Fixed in linux-2.6 2.6.18.dfsg.1-13etch4.

References

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