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    CVE-2006-1056

    The Linux kernel before 2.6.16.9 and the FreeBSD kernel, when running on AMD64 and other 7th and 8th generation AuthenticAMD processors, only save/restore the FOP, FIP, and FDP x87 registers in FXSAVE/FXRSTOR when an exception is pending, which allows one process to determine portions of the state of floating point instructions of other processes, which can be leveraged to obtain sensitive information such as cryptographic keys. NOTE: this is the documented behavior of AMD64 processors, but it is inconsistent with Intel processors in a security-relevant fashion that was not addressed by the kernels.

    Published:Apr 19, 2006
    Last Modified:Apr 16, 2026
    EPS:Apr 20, 2006
    EPSS Score:0.00061
    CVSS Score:2.1

    Affected Products

    Vendor
    Freebsd
    Product
    Freebsd
    Vendor
    Linux
    Product
    Linux Kernel
    Vendor
    Redhat
    Product
    Enterprise Linux

    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-2026-58093 (CVSS 7) — The TIOCSCTTY ioctl handler drops the tty lock in order to acquire the process tree lock. After reacquiring t…
    CVE-2026-58097 (CVSS 7.8) — mp_SetEnddisc() copied a user-supplied PSN endpoint value without length validation, allowing a buffer overflo…
    CVE-2026-58096 (CVSS 8.8) — LcpDecodeConfig() did not validate the length of received endpoint discriminator options against the minimum r…
    CVE-2026-58095 (CVSS 8.8) — mp_Enddisc() used incorrect length calculations when formatting endpoint discriminator addresses for display, …
    CVE-2026-58092 (CVSS 8.1) — In FreeBSD 15.0, the kernel structure used to represent user credentials changed: previously the primary group…
    CVE-2026-58091 (CVSS 7.8) — The implementation of this ioctl attempts to acquire locks on all channels in a sync group. If locking a chan…
    CVE-2026-58090 (CVSS 7.8) — The SOCK_STREAM receive path in the unix socket implementation failed to fully detach control messages from th…
    CVE-2026-58089 (CVSS 7.8) — When a process calls execve(2) to execute a setuid or setgid image, hwpmc(4) is supposed to detach PMCs owned …
    CVE-2026-58088 (CVSS 7.4) — The ELF core dump code counted the number of dumpable VM map entries, allocated a buffer for the corresponding…

    References

    ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:14.fpu.asc
    http://kb.vmware.com/kb/2533126
    http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.16.9
    http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00021.html
    http://lwn.net/Alerts/180820/
    http://marc.info/?l=linux-kernel&m=114548768214478&w=2
    http://secunia.com/advisories/19715
    http://secunia.com/advisories/19724
    http://secunia.com/advisories/19735
    http://secunia.com/advisories/20398
    http://secunia.com/advisories/20671
    http://secunia.com/advisories/20716
    http://secunia.com/advisories/20914
    http://secunia.com/advisories/21035
    http://secunia.com/advisories/21136
    http://secunia.com/advisories/21465
    http://secunia.com/advisories/21983
    http://secunia.com/advisories/22417
    http://secunia.com/advisories/22875
    http://secunia.com/advisories/22876
    http://security.freebsd.org/advisories/FreeBSD-SA-06:14-amd.txt
    http://securitytracker.com/id?1015966
    http://support.avaya.com/elmodocs2/security/ASA-2006-180.htm
    http://support.avaya.com/elmodocs2/security/ASA-2006-200.htm
    http://www.debian.org/security/2006/dsa-1097
    http://www.debian.org/security/2006/dsa-1103
    http://www.novell.com/linux/security/advisories/2006-05-31.html
    http://www.osvdb.org/24746
    http://www.osvdb.org/24807
    http://www.redhat.com/support/errata/RHSA-2006-0437.html
    http://www.redhat.com/support/errata/RHSA-2006-0575.html
    http://www.redhat.com/support/errata/RHSA-2006-0579.html
    http://www.securityfocus.com/archive/1/431341
    http://www.securityfocus.com/archive/1/451404/100/0/threaded
    http://www.securityfocus.com/archive/1/451417/100/200/threaded
    http://www.securityfocus.com/archive/1/451419/100/200/threaded
    http://www.securityfocus.com/archive/1/451421/100/0/threaded
    http://www.securityfocus.com/bid/17600
    http://www.ubuntu.com/usn/usn-302-1
    http://www.vmware.com/download/esx/esx-213-200610-patch.html
    http://www.vmware.com/download/esx/esx-254-200610-patch.html
    http://www.vupen.com/english/advisories/2006/1426
    http://www.vupen.com/english/advisories/2006/1475
    http://www.vupen.com/english/advisories/2006/2554
    http://www.vupen.com/english/advisories/2006/4353
    http://www.vupen.com/english/advisories/2006/4502
    https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=187910
    https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=187911
    https://exchange.xforce.ibmcloud.com/vulnerabilities/25871
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9995
    ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:14.fpu.asc
    http://kb.vmware.com/kb/2533126
    http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.16.9
    http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00021.html
    http://lwn.net/Alerts/180820/
    http://marc.info/?l=linux-kernel&m=114548768214478&w=2
    http://secunia.com/advisories/19715
    http://secunia.com/advisories/19724
    http://secunia.com/advisories/19735
    http://secunia.com/advisories/20398
    http://secunia.com/advisories/20671
    http://secunia.com/advisories/20716
    http://secunia.com/advisories/20914
    http://secunia.com/advisories/21035
    http://secunia.com/advisories/21136
    http://secunia.com/advisories/21465
    http://secunia.com/advisories/21983
    http://secunia.com/advisories/22417
    http://secunia.com/advisories/22875
    http://secunia.com/advisories/22876
    http://security.freebsd.org/advisories/FreeBSD-SA-06:14-amd.txt
    http://securitytracker.com/id?1015966
    http://support.avaya.com/elmodocs2/security/ASA-2006-180.htm
    http://support.avaya.com/elmodocs2/security/ASA-2006-200.htm
    http://www.debian.org/security/2006/dsa-1097
    http://www.debian.org/security/2006/dsa-1103
    http://www.novell.com/linux/security/advisories/2006-05-31.html
    http://www.osvdb.org/24746
    http://www.osvdb.org/24807
    http://www.redhat.com/support/errata/RHSA-2006-0437.html
    http://www.redhat.com/support/errata/RHSA-2006-0575.html
    http://www.redhat.com/support/errata/RHSA-2006-0579.html
    http://www.securityfocus.com/archive/1/431341
    http://www.securityfocus.com/archive/1/451404/100/0/threaded
    http://www.securityfocus.com/archive/1/451417/100/200/threaded
    http://www.securityfocus.com/archive/1/451419/100/200/threaded
    http://www.securityfocus.com/archive/1/451421/100/0/threaded
    http://www.securityfocus.com/bid/17600
    http://www.ubuntu.com/usn/usn-302-1
    http://www.vmware.com/download/esx/esx-213-200610-patch.html
    http://www.vmware.com/download/esx/esx-254-200610-patch.html
    http://www.vupen.com/english/advisories/2006/1426
    http://www.vupen.com/english/advisories/2006/1475
    http://www.vupen.com/english/advisories/2006/2554
    http://www.vupen.com/english/advisories/2006/4353
    http://www.vupen.com/english/advisories/2006/4502
    https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=187910
    https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=187911
    https://exchange.xforce.ibmcloud.com/vulnerabilities/25871
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9995

    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