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Fencer Vulns
high 7.2

CVE-2007-4573 json

The IA32 system call emulation functionality in Linux kernel 2.4.x and 2.6.x before 2.6.22.7, when running on the x86_64 architecture, does…

published 2007-09-24 19 y ago modified 2026-06-16 4 mo ago also EUVD-2007-4555

cvss
7.2
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 57%
public exploits
2
Exploit-DB

Summary

The IA32 system call emulation functionality in Linux kernel 2.4.x and 2.6.x before 2.6.22.7, when running on the x86_64 architecture, does not zero extend the eax register after the 32bit entry path to ptrace is used, which might allow local users to gain privileges by triggering an out-of-bounds access to the system call table using the %RAX register.

Patch / fix

  • kernel RHEL 3 2.4.21-52.EL
  • kernel-smp RHEL 3 2.4.21-52.EL
  • kernel-BOOT RHEL 3 2.4.21-52.EL
  • kernel-source RHEL 3 2.4.21-52.EL
  • kernel-hugemem RHEL 3 2.4.21-52.EL
  • kernel-unsupported RHEL 3 2.4.21-52.EL
  • kernel-smp-unsupported RHEL 3 2.4.21-52.EL
  • kernel-hugemem-unsupported RHEL 3 2.4.21-52.EL

red hat advisories RHSA-2007:0938RHSA-2007:0937RHSA-2007:0936

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-2007-4573 updated

x86_64 syscall vulnerability

  • Red Hat Desktop version 3 kernel 2.4.21-52.EL, kernel-smp 2.4.21-52.EL, kernel-BOOT 2.4.21-52.EL, kernel-source 2.4.21-52.EL, kernel-hugemem 2.4.21-52.EL, kernel-unsupported 2.4.21-52.EL, +2 more
    fixed: vendor fix RHSA-2007:0938
  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-8.1.14.el5, kernel-PAE 2.6.18-8.1.14.el5, kernel-xen 2.6.18-8.1.14.el5, kernel-kdump 2.6.18-8.1.14.el5, kernel-debuginfo-common 2.6.18-8.1.14.el5
    fixed: vendor fix RHSA-2007:0936
  • Red Hat Enterprise Linux AS version 3 kernel 2.4.21-52.EL, kernel-smp 2.4.21-52.EL, kernel-BOOT 2.4.21-52.EL, kernel-source 2.4.21-52.EL, kernel-hugemem 2.4.21-52.EL, kernel-unsupported 2.4.21-52.EL, +2 more
    fixed: vendor fix RHSA-2007:0938
  • Red Hat Enterprise Linux AS version 4 kernel 2.6.9-55.0.9.EL, kernel-smp 2.6.9-55.0.9.EL, kernel-xenU 2.6.9-55.0.9.EL, kernel-hugemem 2.6.9-55.0.9.EL, kernel-largesmp 2.6.9-55.0.9.EL
    fixed: vendor fix RHSA-2007:0937
  • Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-8.1.14.el5, kernel-PAE 2.6.18-8.1.14.el5, kernel-xen 2.6.18-8.1.14.el5, kernel-kdump 2.6.18-8.1.14.el5, kernel-debuginfo-common 2.6.18-8.1.14.el5
    fixed: vendor fix RHSA-2007:0936
  • Red Hat Enterprise Linux Desktop version 4 kernel 2.6.9-55.0.9.EL, kernel-smp 2.6.9-55.0.9.EL, kernel-xenU 2.6.9-55.0.9.EL, kernel-hugemem 2.6.9-55.0.9.EL, kernel-largesmp 2.6.9-55.0.9.EL
    fixed: vendor fix RHSA-2007:0937
  • Red Hat Enterprise Linux ES version 3 kernel 2.4.21-52.EL, kernel-smp 2.4.21-52.EL, kernel-BOOT 2.4.21-52.EL, kernel-source 2.4.21-52.EL, kernel-hugemem 2.4.21-52.EL, kernel-unsupported 2.4.21-52.EL, +2 more
    fixed: vendor fix RHSA-2007:0938
  • Red Hat Enterprise Linux ES version 4 kernel 2.6.9-55.0.9.EL, kernel-smp 2.6.9-55.0.9.EL, kernel-xenU 2.6.9-55.0.9.EL, kernel-hugemem 2.6.9-55.0.9.EL, kernel-largesmp 2.6.9-55.0.9.EL
    fixed: vendor fix RHSA-2007:0937
show 2 more
  • Red Hat Enterprise Linux WS version 3 kernel 2.4.21-52.EL, kernel-smp 2.4.21-52.EL, kernel-BOOT 2.4.21-52.EL, kernel-source 2.4.21-52.EL, kernel-hugemem 2.4.21-52.EL, kernel-unsupported 2.4.21-52.EL, +2 more
    fixed: vendor fix RHSA-2007:0938
  • Red Hat Enterprise Linux WS version 4 kernel 2.6.9-55.0.9.EL, kernel-smp 2.6.9-55.0.9.EL, kernel-xenU 2.6.9-55.0.9.EL, kernel-hugemem 2.6.9-55.0.9.EL, kernel-largesmp 2.6.9-55.0.9.EL
    fixed: vendor fix RHSA-2007:0937

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

Timeline

  1. First public exploit (EDB-30604)
  2. Published

Exploit prediction

0.82% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-30604 Linux Kernel 2.6.x - Ptrace Privilege Escalation local, 2007-09-21
  • EDB-4460 Linux Kernel 2.4/2.6 (x86-64) - System Call Emulation Privilege Escalation local, 2007-09-27

CVSS scores

assigned by version score vector
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-264 Permissions, Privileges, and Access Controls
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.