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CVE-2011-4029· NVD / CVE Program· CNA mitre

The LockServer function in os/utils.c in X.Org xserver before 1.11.2 allows local users to change the permissions of arbitrary files to 444,

The LockServer function in os/utils.c in X.Org xserver before 1.11.2 allows local users to change the permissions of arbitrary files to 444, read those files, and possibly cause a denial of service (removed execution permission) via a symlink attack on a temporary lock file.

LowCVSS 1.9 · v2.0—Proof of concept Fix available
Published
Jul 3, 2012
Updated
Jun 16, 2026
EPSS
0.6% · 47th percentile
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Action score

7

Monitor

Low priority for now.

CVSS
7 / 40 · 1.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

Affected systems

VendorProduct
x.orgx server

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • x.org x serverup to 1.11.1 inclusive
  • x.org x server1.11.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12xorg-serverbefore 2:1.11.1.901-22:1.11.1.901-2
Red Hat:enterprise_linux:6::clientxorg-x11-serverbefore 0:1.10.6-1.el60:1.10.6-1.el6
Red Hat:enterprise_linux:6::clientxorg-x11-server-commonbefore 0:1.10.6-1.el60:1.10.6-1.el6
Red Hat:enterprise_linux:6::clientxorg-x11-server-debuginfobefore 0:1.10.6-1.el60:1.10.6-1.el6
Red Hat:enterprise_linux:6::clientxorg-x11-server-develbefore 0:1.10.6-1.el60:1.10.6-1.el6
Red Hat:enterprise_linux:6::clientxorg-x11-server-sourcebefore 0:1.10.6-1.el60:1.10.6-1.el6
Red Hat:enterprise_linux:6::clientxorg-x11-server-Xdmxbefore 0:1.10.6-1.el60:1.10.6-1.el6
Red Hat:enterprise_linux:6::clientxorg-x11-server-Xephyrbefore 0:1.10.6-1.el60:1.10.6-1.el6
Red Hat:enterprise_linux:6::clientxorg-x11-server-Xnestbefore 0:1.10.6-1.el60:1.10.6-1.el6
Red Hat:enterprise_linux:6::clientxorg-x11-server-Xorgbefore 0:1.10.6-1.el60:1.10.6-1.el6
Red Hat:enterprise_linux:6::clientxorg-x11-server-Xvfbbefore 0:1.10.6-1.el60:1.10.6-1.el6

Same product

x.org: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-6816Xorg-x11-server: heap buffer overflow in devicefocusevent and procxiquerypointer
    40Plan
  • CVE-2007-6427The XInput extension in X.Org Xserver before 1.4.1 allows context-dependent attackers to execute arbitrary code via requests related to byte
    38Monitor
  • CVE-2026-56000xorg-x11-server / xwayland GLX contextTags Use-After-Free in CommonMakeCurrent()
    36Monitor
  • CVE-2026-34002Xorg: xwayland: x.org x server: information disclosure or denial of service via out-of-bounds read in xkb modifier map handling
    36Monitor
  • CVE-2026-34000Xwayland: xorg: x.org x server: information disclosure and denial of service via out-of-bounds read in xkb geometry processing.
    36Monitor
  • CVE-2022-46344A vulnerability was found in X.Org.
    36Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:xorg-server2:1.11.1.901-2 · Debian:12Package registry (OSV)
red hat:xorg-x11-server0:1.10.6-1.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:xorg-x11-server-common0:1.10.6-1.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:xorg-x11-server-debuginfo0:1.10.6-1.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:xorg-x11-server-devel0:1.10.6-1.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:xorg-x11-server-source0:1.10.6-1.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:xorg-x11-server-Xdmx0:1.10.6-1.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:xorg-x11-server-Xephyr0:1.10.6-1.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:xorg-x11-server-Xnest0:1.10.6-1.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:xorg-x11-server-Xorg0:1.10.6-1.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:xorg-x11-server-Xvfb0:1.10.6-1.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Exploit-DB entry ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Exploit-DB entrylocal2011-10-28

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-250 d
  2. Published
  3. TodaySep 30, 2026+5202 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

    If successful

    Confidentiality
    P · data can be read
    Integrity
    none
    Availability
    none
    Attack complexity
    M
    Confidentiality impact
    P
    Integrity impact
    None
    Availability impact
    None

    Weakness class (CWE)

    CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

    CVSS vector

    AV:L/AC:M/Au:N/C:P/I:N/A:N

    nvd-primary

    Attack context

    MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

    ATT&CK techniques

    —

    Noroxi analysis

    No Noroxi analysis for this record yet

    We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

    We use this product, ask for help

    Change log

    1. Fix✗ → ✓

    For records you follow, these changes also arrive as notifications. →

    References

    Vendor advisories and official records. Exploit/PoC links are deliberately left out.

    All records