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…
Does this matter?
Lower severity and a low EPSS score (0.46%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 2.0
- 2.1 LOWAV:L/AC:L/Au:N/C:P/I:N/A:N
- EPSS
- 0.46% probability · 40th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-310
- Affected
- freebsd/freebsd · linux/linux kernel
- Source
- secalert@redhat.com
EPSS 0.5% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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/19715Patch, Vendor Advisory
- http://secunia.com/advisories/19724Patch, Vendor Advisory
- http://secunia.com/advisories/19735Vendor Advisory
- http://secunia.com/advisories/20398Vendor Advisory
- http://secunia.com/advisories/20671Vendor Advisory
- http://secunia.com/advisories/20716Vendor Advisory
- http://secunia.com/advisories/20914Vendor Advisory
- http://secunia.com/advisories/21035Vendor Advisory
- http://secunia.com/advisories/21136Vendor Advisory
- http://secunia.com/advisories/21465Vendor Advisory
- http://secunia.com/advisories/21983Vendor Advisory
- http://secunia.com/advisories/22417Vendor Advisory
- http://secunia.com/advisories/22875Vendor Advisory
- http://secunia.com/advisories/22876Vendor Advisory
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.