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    CVE-2006-5173

    Linux kernel does not properly save or restore EFLAGS during a context switch, or reset the flags when creating new threads, which allows local users to cause a denial of service (process crash), as demonstrated using a process that sets the Alignment Check flag (EFLAGS 0x40000), which triggers a SIGBUS in other processes that have an unaligned access.

    Published:Oct 17, 2006
    Last Modified:Apr 23, 2026
    EPS:Oct 17, 2006
    EPSS Score:0.00065
    CVSS Score:2.1

    Affected Products

    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Linux
    Product
    Linux Kernel

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-47336 (CVSS 3.3) — Ubuntu Linux 6.8 contains SAUCE patches with a possible use of an uninitialized variable in AppArmor AF_INET/A…
    CVE-2026-47335 (CVSS 5.5) — Ubuntu Linux 6.8 contains SAUCE patches with a possible NULL pointer dereference in the handling of AppArmor n…
    CVE-2026-47334 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly sleep while holding a spinlock…
    CVE-2026-47333 (CVSS 7.8) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the si…
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    References

    http://kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=47a5c6fa0e204a2b63309c648bb2fde36836c826
    http://secunia.com/advisories/23361
    http://secunia.com/advisories/23384
    http://secunia.com/advisories/23474
    http://secunia.com/advisories/23593
    http://secunia.com/advisories/25691
    http://www.mandriva.com/security/advisories?name=MDKSA-2007:002
    http://www.novell.com/linux/security/advisories/2006_79_kernel.html
    http://www.securityfocus.com/archive/1/471457
    http://www.securityfocus.com/bid/21851
    http://www.ubuntu.com/usn/usn-395-1
    http://kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=47a5c6fa0e204a2b63309c648bb2fde36836c826
    http://secunia.com/advisories/23361
    http://secunia.com/advisories/23384
    http://secunia.com/advisories/23474
    http://secunia.com/advisories/23593
    http://secunia.com/advisories/25691
    http://www.mandriva.com/security/advisories?name=MDKSA-2007:002
    http://www.novell.com/linux/security/advisories/2006_79_kernel.html
    http://www.securityfocus.com/archive/1/471457
    http://www.securityfocus.com/bid/21851
    http://www.ubuntu.com/usn/usn-395-1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High