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Fencer Intel
high 7.8

CVE-2009-4537 json

drivers/net/r8169.c in the r8169 driver in the Linux kernel 2.6.32.3 and earlier does not properly check the size of an Ethernet frame that…

published 16y ago modified 4mo ago also EUVD-2009-4503

cvss
7.8
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.9%
EPSS 5.9% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

drivers/net/r8169.c in the r8169 driver in the Linux kernel 2.6.32.3 and earlier does not properly check the size of an Ethernet frame that exceeds the MTU, which allows remote attackers to (1) cause a denial of service (temporary network outage) via a packet with a crafted size, in conjunction with certain packets containing A characters and certain packets containing E characters; or (2) cause a denial of service (system crash) via a packet with a crafted size, in conjunction with certain packets containing '\0' characters, related to the value of the status register and erroneous behavior associated with the RxMaxSize register. NOTE: this vulnerability exists because of an incorrect fix for CVE-2009-1389.

Patch / fix

  • rhev-hypervisor RHEL 5 5.4-2.1.8.el5_4rhev2_1
  • rhev-hypervisor-pxe RHEL 5 5.4-2.1.8.el5_4rhev2_1
  • kernel-rt enterprise mrg 1 2.6.24.7-146.el5rt
  • kernel-rt-trace enterprise mrg 1 2.6.24.7-146.el5rt
  • kernel-rt-vanilla enterprise mrg 1 2.6.24.7-146.el5rt
  • kernel-rt-debuginfo-common enterprise mrg 1 2.6.24.7-146.el5rt
  • kernel RHEL 4 2.6.9-89.0.19.EL
  • kernel-smp RHEL 4 2.6.9-89.0.19.EL

red hat advisories RHSA-2010:0079RHSA-2010:0111RHSA-2010:0053RHSA-2010:0095RHSA-2010:0041RHSA-2010:0020

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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-2009-4537 updated cvss 7.1

kernel: r8169 issue reported at 26c3

  • Red Hat MRG Realtime for RHEL 5 Server kernel-rt 2.6.24.7-146.el5rt, kernel-rt-trace 2.6.24.7-146.el5rt, kernel-rt-vanilla 2.6.24.7-146.el5rt, kernel-rt-debuginfo-common 2.6.24.7-146.el5rt
    fixed: vendor fix RHSA-2010:0041
  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-164.10.1.el5, kernel-PAE 2.6.18-164.10.1.el5, kernel-xen 2.6.18-164.10.1.el5, kernel-kdump 2.6.18-164.10.1.el5, kernel-debuginfo-common 2.6.18-164.10.1.el5
    fixed: vendor fix RHSA-2010:0019
  • Red Hat Enterprise Linux AS EUS (v. 4.7) kernel 2.6.9-78.0.29.EL, kernel-smp 2.6.9-78.0.29.EL, kernel-xenU 2.6.9-78.0.29.EL, kernel-hugemem 2.6.9-78.0.29.EL, kernel-largesmp 2.6.9-78.0.29.EL
    fixed: vendor fix RHSA-2010:0111
  • Red Hat Enterprise Linux AS version 4 kernel 2.6.9-89.0.19.EL, kernel-smp 2.6.9-89.0.19.EL, kernel-xenU 2.6.9-89.0.19.EL, kernel-hugemem 2.6.9-89.0.19.EL, kernel-largesmp 2.6.9-89.0.19.EL
    fixed: vendor fix RHSA-2010:0020
  • Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-164.10.1.el5, kernel-PAE 2.6.18-164.10.1.el5, kernel-xen 2.6.18-164.10.1.el5, kernel-debuginfo-common 2.6.18-164.10.1.el5
    fixed: vendor fix RHSA-2010:0019
  • Red Hat Enterprise Linux Desktop version 4 kernel 2.6.9-89.0.19.EL, kernel-smp 2.6.9-89.0.19.EL, kernel-xenU 2.6.9-89.0.19.EL, kernel-hugemem 2.6.9-89.0.19.EL, kernel-largesmp 2.6.9-89.0.19.EL
    fixed: vendor fix RHSA-2010:0020
  • Red Hat Enterprise Linux ES EUS (v. 4.7) kernel 2.6.9-78.0.29.EL, kernel-smp 2.6.9-78.0.29.EL, kernel-xenU 2.6.9-78.0.29.EL, kernel-hugemem 2.6.9-78.0.29.EL, kernel-largesmp 2.6.9-78.0.29.EL
    fixed: vendor fix RHSA-2010:0111
  • Red Hat Enterprise Linux ES version 4 kernel 2.6.9-89.0.19.EL, kernel-smp 2.6.9-89.0.19.EL, kernel-xenU 2.6.9-89.0.19.EL, kernel-hugemem 2.6.9-89.0.19.EL, kernel-largesmp 2.6.9-89.0.19.EL
    fixed: vendor fix RHSA-2010:0020
show 5 more
  • Red Hat Enterprise Linux EUS (v. 5.2 server) kernel 2.6.18-92.1.35.el5, kernel-PAE 2.6.18-92.1.35.el5, kernel-xen 2.6.18-92.1.35.el5, kernel-kdump 2.6.18-92.1.35.el5, kernel-debuginfo-common 2.6.18-92.1.35.el5
    fixed: vendor fix RHSA-2010:0079
  • Red Hat Enterprise Linux EUS (v. 5.3 server) kernel 2.6.18-128.12.1.el5, kernel-PAE 2.6.18-128.12.1.el5, kernel-xen 2.6.18-128.12.1.el5, kernel-kdump 2.6.18-128.12.1.el5, kernel-debuginfo-common 2.6.18-128.12.1.el5
    fixed: vendor fix RHSA-2010:0053
  • Red Hat Enterprise Linux WS version 4 kernel 2.6.9-89.0.19.EL, kernel-smp 2.6.9-89.0.19.EL, kernel-xenU 2.6.9-89.0.19.EL, kernel-hugemem 2.6.9-89.0.19.EL, kernel-largesmp 2.6.9-89.0.19.EL
    fixed: vendor fix RHSA-2010:0020
  • Red Hat Enterprise Virtualization Hypervisor 5 rhev-hypervisor 5.4-2.1.8.el5_4rhev2_1, rhev-hypervisor-pxe 5.4-2.1.8.el5_4rhev2_1
    fixed: vendor fix RHSA-2010:0095
  • Red Hat Enterprise Linux (v. 5 server) kernel-headers 2.6.18-164.10.1.el5 Red Hat Enterprise Linux Desktop (v. 5 client) kernel-headers 2.6.18-164.10.1.el5 Red Hat Enterprise Linux EUS (v. 5.2 server) kernel-headers 2.6.18-92.1.35.el5 Red Hat Enterprise Linux EUS (v. 5.3 server) kernel-headers 2.6.18-128.12.1.el5
    not affected: vulnerable code not present

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

5.89% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness
  • CWE-20 Improper Input Validation
Technology feeds

References

Sources

Fencer Intel 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.