kernel: keys: NULL pointer deref in the user-defined key type
Published Jan 27, 2012
2.1
LOWCVSS 2.0
EPSS 0.47%
Description
The user_update function in security/keys/user_defined.c in the Linux kernel 2.6 allows local users to cause a denial of service (NULL pointer dereference and kernel oops) via vectors related to a user-defined key and "updating a negative key into a fully instantiated key."
Affected products
No data.
- 2.6
No data.
Red Hat Enterprise Linux 5
kernel-0:2.6.18-274.12.1.el5
Fixed · RHSA-2011:1479
Red Hat Enterprise Linux 6
kernel-0:2.6.32-220.el6
Fixed · RHSA-2011:1530
Red Hat Enterprise Linux 6.1 EUS - Server Only
kernel-0:2.6.32-131.25.1.el6
Fixed · RHSA-2012:0116
Red Hat Enterprise MRG 2
kernel-rt-0:2.6.33.9-rt31.79.el6rt
Fixed · RHSA-2012:0010
Red Hat Enterprise MRG 2
kernel-rt-0:3.0.18-rt34.53.el6rt
Fixed · RHSA-2012:0333
Red Hat Enterprise Linux 4
kernel
Affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel-0:2.6.18-274.12.1.el5 | Fixed | RHSA-2011:1479 |
| Red Hat Enterprise Linux 6 | kernel-0:2.6.32-220.el6 | Fixed | RHSA-2011:1530 |
| Red Hat Enterprise Linux 6.1 EUS - Server Only | kernel-0:2.6.32-131.25.1.el6 | Fixed | RHSA-2012:0116 |
| Red Hat Enterprise MRG 2 | kernel-rt-0:2.6.33.9-rt31.79.el6rt | Fixed | RHSA-2012:0010 |
| Red Hat Enterprise MRG 2 | kernel-rt-0:3.0.18-rt34.53.el6rt | Fixed | RHSA-2012:0333 |
| Red Hat Enterprise Linux 4 | kernel | Affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue affects the Linux kernel as shipped with Red Hat Enterprise Linux 4, 5, 6, and Red Hat Enterprise MRG. This has been addressed in Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG via https://rhn.redhat.com/errata/RHSA-2011-1479.html, https://rhn.redhat.com/errata/RHSA-2011-1530.html, and https://rhn.redhat.com/errata/RHSA-2012-0010.html. Red Hat Enterprise Linux 4 is now in Production 3 of the maintenance life-cycle, https://access.redhat.com/support/policy/updates/errata/, therefore the fix for this issue is not currently planned to be included in the future updates.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:L/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.47% (0.00467) | 38.11th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.48% (0.00484) | 37.72th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.10% (0.00104) | 25.97th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00042) | 5.07th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00042) | 5.63th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.28% (0.01282) | 68.34th | v2 (v2022.01.01) |
| Feb 13, 2023 | 1.28% (0.01282) | 67.79th | v2 (v2022.01.01) |
| Feb 3, 2023 | 1.55% (0.01547) | 74.40th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.28% (0.01282) | 65.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.28% (0.01282) | 41.72th | v2 (v2022.01.01) |
References (14)
- http://marc.info/?l=bugtraq&m=139447903326211&w=2 vendor-advisoryx_refsource_HP
- http://secunia.com/advisories/47754 third-party-advisoryx_refsource_SECUNIA
- http://www.openwall.com/lists/oss-security/2011/11/21/19 mailing-listx_refsource_MLIST
- http://www.openwall.com/lists/oss-security/2011/11/22/5 mailing-listx_refsource_MLIST
- http://www.openwall.com/lists/oss-security/2011/11/22/6 mailing-listx_refsource_MLIST
- http://www.securityfocus.com/bid/50755 vdb-entryx_refsource_BID
- http://www.ubuntu.com/usn/USN-1324-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-1328-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-1344-1 vendor-advisoryx_refsource_UBUNTU
- https://access.redhat.com/security/cve/CVE-2011-4110 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=751297 x_refsource_CONFIRMPatchIssue Tracking
- https://lkml.org/lkml/2011/11/15/363 mailing-listx_refsource_MLISTExploit
- https://nvd.nist.gov/vuln/detail/CVE-2011-4110
- https://www.cve.org/CVERecord?id=CVE-2011-4110
Change history (0)
No recorded changes yet.