kernel: pid namespace leak in kernel 3.0 and 3.1
Published Jun 21, 2012
5.0
MEDIUMCVSS 2.0
EPSS 4.31%
Description
fs/proc/root.c in the procfs implementation in the Linux kernel before 3.2 does not properly interact with CLONE_NEWPID clone system calls, which allows remote attackers to cause a denial of service (reference leak and memory consumption) by making many connections to a daemon that uses PID namespaces to isolate clients, as demonstrated by vsftpd.
Affected products
No data.
- ≤ 3.1.10
- 3.1.1
- 3.1.2
- 3.1.3
- 3.1.4
- 3.1.5
- 3.1.6
- 3.1.7
- 3.1.8
- 3.1.9
No data.
Red Hat Enterprise Linux 4
kernel
Not affected
Red Hat Enterprise Linux 5
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise MRG 2
realtime-kernel
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 5 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise MRG 2 | realtime-kernel | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the Linux kernel as shipped with Red Hat Enterprise Linux 4, 5, and 6 as they did not backport the upstream commit 423e0ab0 that introduced this issue. This issue did not affect Red Hat Enteprise Linux MRG 2.
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:N/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 | 4.31% (0.04309) | 90.84th | v5 (v2026.06.15) |
| Jun 15, 2026 | 4.31% (0.04309) | 89.85th | v5 (v2026.06.15) |
| Mar 17, 2025 | 1.92% (0.01921) | 82.14th | v4 (v2025.03.14) |
| Dec 12, 2024 | 4.39% (0.04388) | 92.69th | v3 (v2023.03.01) |
| Jul 10, 2024 | 4.39% (0.04388) | 92.46th | v3 (v2023.03.01) |
| Nov 17, 2023 | 4.32% (0.04324) | 91.39th | v3 (v2023.03.01) |
| Mar 7, 2023 | 4.51% (0.04512) | 91.18th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.17% (0.02172) | 80.77th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.17% (0.02172) | 78.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.17% (0.02172) | 57.73th | v2 (v2022.01.01) |
References (14)
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=905ad269c55fc62bee3da29f7b1d1efeba8aa1e1 x_refsource_CONFIRM
- http://ubuntu.com/usn/usn-1607-1 vendor-advisoryx_refsource_UBUNTU
- http://www.kernel.org/pub/linux/kernel/v3.x/ x_refsource_CONFIRM
- http://www.kernel.org/pub/linux/kernel/v3.x/patch-3.2.bz2 x_refsource_CONFIRMPatch
- http://www.openwall.com/lists/oss-security/2012/04/20/25 mailing-listx_refsource_MLISTExploit
- http://www.openwall.com/lists/oss-security/2012/04/22/1 mailing-listx_refsource_MLIST
- http://www.securityfocus.com/bid/55774 vdb-entryx_refsource_BID
- http://www.ubuntu.com/usn/USN-1594-1 vendor-advisoryx_refsource_UBUNTU
- https://access.redhat.com/security/cve/CVE-2012-2127 Vendor Advisory
- https://bugzilla.novell.com/show_bug.cgi?id=757783 x_refsource_CONFIRMExploit
- https://bugzilla.redhat.com/show_bug.cgi?id=815188 x_refsource_CONFIRMExploitIssue Tracking
- https://github.com/torvalds/linux/commit/905ad269c55fc62bee3da29f7b1d1efeba8aa1e1 x_refsource_CONFIRMExploitPatch
- https://nvd.nist.gov/vuln/detail/CVE-2012-2127
- https://www.cve.org/CVERecord?id=CVE-2012-2127
Change history (0)
No recorded changes yet.