CVE-2004-0565: Floating point information leak in the context switch code for Linux 2.4.x only checks the MFH bit but does no
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Routine
LOW 2.1WATCHLISTDOWNGRADEMITIGATEMITIGATE
CVE-2004-0565 is a low-severity flaw (CVSS 2.1) affecting mandrake multi network firewall, linux, linux kernel. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Floating point information leak in the context switch code for Linux 2.4.x only checks the MFH bit but does not verify the FPH owner, which allows local users to read register values of other processes by setting the MFH bit.
Why this priority
On your watchlist
No fix is published yet: follow the downgrade or mitigation steps.
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
gentoo linux MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
linux linux kernel MITIGATE
Affected: 2.4.0
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Downgrade not recommended
This is a core system component: downgrading can break the OS. Apply the distro update or the vendor mitigation.
mandrakesoft mandrake linux MITIGATE
Affected: 9.1 · 9.2 · 10.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 9.1
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
mandrakesoft mandrake linux corporate server MITIGATE
Affected: 2.1
Fixed in: no fixed release known
Safe to downgrade to: a release before 2.1
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
trustix secure linux MITIGATE
Affected: 2 · 2.0 · 2.1
Fixed in: no fixed release known
Safe to downgrade to: a release before 2
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Verify at the official sourceNVD · CVE Program · Report a problem with this page Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2004-0565?
mandrake multi network firewall: downgrade or apply the listed mitigation; linux: mitigate or apply the listed mitigation; linux kernel: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2004-0565 being exploited?
CVE-2004-0565 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2004-0565 affect?
CVE-2004-0565 affects mandrake multi network firewall, linux, linux kernel. Severity is low (CVSS 2.1). Floating point information leak in the context switch code for Linux 2.4.x only checks the MFH bit but does not verify the FPH owner, which allows local users to read register values of other processes by setting the MFH bit.
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