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Fencer Vulns
medium 4.4

CVE-2009-1630 json

The nfs_permission function in fs/nfs/dir.c in the NFS client implementation in the Linux kernel 2.6.29.3 and earlier, when atomic_open is…

published 2009-05-14 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-1625

cvss
4.4
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits
0
none known

Summary

The nfs_permission function in fs/nfs/dir.c in the NFS client implementation in the Linux kernel 2.6.29.3 and earlier, when atomic_open is available, does not check execute (aka EXEC or MAY_EXEC) permission bits, which allows local users to bypass permissions and execute files, as demonstrated by files on an NFSv4 fileserver.

Patch / fix

  • kernel RHEL 4 2.6.9-89.0.3.EL
  • kernel-smp RHEL 4 2.6.9-89.0.3.EL
  • kernel-xenU RHEL 4 2.6.9-89.0.3.EL
  • kernel-hugemem RHEL 4 2.6.9-89.0.3.EL
  • kernel-largesmp RHEL 4 2.6.9-89.0.3.EL
  • 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

red hat advisories RHSA-2009:1132RHSA-2009:1106RHSA-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-2009-1630 updated cvss 2.1

kernel: nfs: fix NFS v4 client handling of MAY_EXEC in nfs_permission

  • 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 2.6.9-89.0.3.EL, kernel-smp 2.6.9-89.0.3.EL, kernel-xenU 2.6.9-89.0.3.EL, kernel-hugemem 2.6.9-89.0.3.EL, kernel-largesmp 2.6.9-89.0.3.EL
    fixed: vendor fix RHSA-2009:1132
  • 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-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 Desktop version 4 kernel 2.6.9-89.0.3.EL, kernel-smp 2.6.9-89.0.3.EL, kernel-xenU 2.6.9-89.0.3.EL, kernel-hugemem 2.6.9-89.0.3.EL, kernel-largesmp 2.6.9-89.0.3.EL Red Hat Enterprise Linux ES version 4 kernel 2.6.9-89.0.3.EL, kernel-smp 2.6.9-89.0.3.EL, kernel-xenU 2.6.9-89.0.3.EL, kernel-hugemem 2.6.9-89.0.3.EL, kernel-largesmp 2.6.9-89.0.3.EL Red Hat Enterprise Linux WS version 4 kernel 2.6.9-89.0.3.EL, kernel-smp 2.6.9-89.0.3.EL, kernel-xenU 2.6.9-89.0.3.EL, kernel-hugemem 2.6.9-89.0.3.EL, kernel-largesmp 2.6.9-89.0.3.EL
    fixed: vendor fix RHSA-2009:1132

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

0.48% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=500297 referenced PoC, tagged "exploit" by a source, unverified
  • article.gmane.org http://article.gmane.org/gmane.linux.nfs/26592 referenced PoC, tagged "exploit" by a source, unverified
  • openwall.com http://www.openwall.com/lists/oss-security/2009/05/13/2 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 4.4 AV:L/AC:M/Au:N/C:P/I:P/A:P

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.