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Fencer Vulns
low 2.1

CVE-2004-0565 json

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…

published 2004-07-08 22 y ago modified 2026-06-16 4 mo ago also EUVD-2004-0564

cvss
2.1
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 38%
public exploits
0
none known

Summary

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.

Patch / fix

  • kernel RHEL 3 2.4.21-27.0.1.EL
  • kernel-smp RHEL 3 2.4.21-27.0.1.EL
  • kernel-BOOT RHEL 3 2.4.21-27.0.1.EL
  • kernel-source RHEL 3 2.4.21-27.0.1.EL
  • kernel-hugemem RHEL 3 2.4.21-27.0.1.EL
  • kernel-unsupported RHEL 3 2.4.21-27.0.1.EL
  • kernel-smp-unsupported RHEL 3 2.4.21-27.0.1.EL
  • kernel-hugemem-unsupported RHEL 3 2.4.21-27.0.1.EL

red hat advisories RHSA-2004:689

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2004-0565 updated

security flaw

  • Red Hat Desktop version 3 kernel 2.4.21-27.0.1.EL, kernel-smp 2.4.21-27.0.1.EL, kernel-BOOT 2.4.21-27.0.1.EL, kernel-source 2.4.21-27.0.1.EL, kernel-hugemem 2.4.21-27.0.1.EL, kernel-unsupported 2.4.21-27.0.1.EL, +2 more Red Hat Enterprise Linux AS version 3 kernel 2.4.21-27.0.1.EL, kernel-smp 2.4.21-27.0.1.EL, kernel-BOOT 2.4.21-27.0.1.EL, kernel-source 2.4.21-27.0.1.EL, kernel-hugemem 2.4.21-27.0.1.EL, kernel-unsupported 2.4.21-27.0.1.EL, +2 more Red Hat Enterprise Linux ES version 3 kernel 2.4.21-27.0.1.EL, kernel-smp 2.4.21-27.0.1.EL, kernel-BOOT 2.4.21-27.0.1.EL, kernel-source 2.4.21-27.0.1.EL, kernel-hugemem 2.4.21-27.0.1.EL, kernel-unsupported 2.4.21-27.0.1.EL, +2 more Red Hat Enterprise Linux WS version 3 kernel 2.4.21-27.0.1.EL, kernel-smp 2.4.21-27.0.1.EL, kernel-BOOT 2.4.21-27.0.1.EL, kernel-source 2.4.21-27.0.1.EL, kernel-hugemem 2.4.21-27.0.1.EL, kernel-unsupported 2.4.21-27.0.1.EL, +2 more
    fixed: vendor fix RHSA-2004:689
  • Red Hat Linux Advanced Workstation 2.1
    fixed: vendor fix RHSA-2004:504

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N

Classification

Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.