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Fencer Vulns
high 7.1

CVE-2009-1633 json

Multiple buffer overflows in the cifs subsystem in the Linux kernel before 2.6.29.4 allow remote CIFS servers to cause a denial of service…

published 2009-05-28 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-1628

cvss
7.1
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.0%
EPSS 3.0% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

Multiple buffer overflows in the cifs subsystem in the Linux kernel before 2.6.29.4 allow remote CIFS servers to cause a denial of service (memory corruption) and possibly have unspecified other impact via (1) a malformed Unicode string, related to Unicode string area alignment in fs/cifs/sess.c; or (2) long Unicode characters, related to fs/cifs/cifssmb.c and the cifs_readdir function in fs/cifs/readdir.c.

Patch / fix

  • linux linux_kernel 2.6.29.4
  • kernel RHEL 5 2.6.18-128.1.14.el5
  • kernel-PAE RHEL 5 2.6.18-128.1.14.el5
  • kernel-xen RHEL 5 2.6.18-128.1.14.el5
  • kernel-kdump RHEL 5 2.6.18-128.1.14.el5
  • kernel-debuginfo-common RHEL 5 2.6.18-128.1.14.el5
  • kernel RHEL 4 2.6.9-89.0.7.EL
  • kernel-smp RHEL 4 2.6.9-89.0.7.EL
  • kernel-xenU RHEL 4 2.6.9-89.0.7.EL

red hat advisories RHSA-2009:1106RHSA-2009:1211RHSA-2009:1157

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-2009-1633 updated cvss 7.1

kernel: cifs: fix potential buffer overruns when converting unicode strings sent by server

  • Red Hat MRG Realtime for RHEL 5 Server kernel-rt 2.6.24.7-126.el5rt, kernel-rt-trace 2.6.24.7-126.el5rt, kernel-rt-vanilla 2.6.24.7-126.el5rt, kernel-rt-debuginfo-common 2.6.24.7-126.el5rt
    fixed: vendor fix RHSA-2009:1157
  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-128.1.14.el5, kernel-PAE 2.6.18-128.1.14.el5, kernel-xen 2.6.18-128.1.14.el5, kernel-kdump 2.6.18-128.1.14.el5, kernel-debuginfo-common 2.6.18-128.1.14.el5
    fixed: vendor fix RHSA-2009:1106
  • Red Hat Enterprise Linux AS version 4 kernel 2.6.9-89.0.7.EL, kernel-smp 2.6.9-89.0.7.EL, kernel-xenU 2.6.9-89.0.7.EL, kernel-hugemem 2.6.9-89.0.7.EL, kernel-largesmp 2.6.9-89.0.7.EL
    fixed: vendor fix RHSA-2009:1211
  • Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-128.1.14.el5, kernel-PAE 2.6.18-128.1.14.el5, kernel-xen 2.6.18-128.1.14.el5, kernel-debuginfo-common 2.6.18-128.1.14.el5
    fixed: vendor fix RHSA-2009:1106
  • Red Hat Enterprise Linux Desktop version 4 kernel 2.6.9-89.0.7.EL, kernel-smp 2.6.9-89.0.7.EL, kernel-xenU 2.6.9-89.0.7.EL, kernel-hugemem 2.6.9-89.0.7.EL, kernel-largesmp 2.6.9-89.0.7.EL Red Hat Enterprise Linux ES version 4 kernel 2.6.9-89.0.7.EL, kernel-smp 2.6.9-89.0.7.EL, kernel-xenU 2.6.9-89.0.7.EL, kernel-hugemem 2.6.9-89.0.7.EL, kernel-largesmp 2.6.9-89.0.7.EL Red Hat Enterprise Linux WS version 4 kernel 2.6.9-89.0.7.EL, kernel-smp 2.6.9-89.0.7.EL, kernel-xenU 2.6.9-89.0.7.EL, kernel-hugemem 2.6.9-89.0.7.EL, kernel-largesmp 2.6.9-89.0.7.EL
    fixed: vendor fix RHSA-2009:1211

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

3.03% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 7.1 AV:N/AC:M/Au:N/C:N/I:N/A:C

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
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.