kernel: no access restrictions of /proc/pid/* after setuid program exec
Published Feb 28, 2011
4.6
MEDIUMCVSS 2.0
EPSS 0.92%
Description
The proc filesystem implementation in the Linux kernel 2.6.37 and earlier does not restrict access to the /proc directory tree of a process after this process performs an exec of a setuid program, which allows local users to obtain sensitive information or cause a denial of service via open, lseek, read, and write system calls.
Affected products
No data.
- < 2.6.37
No data.
Red Hat Enterprise Linux 5
kernel-0:2.6.18-274.17.1.el5
Fixed · RHSA-2012:0007
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-rt31.75.el6rt
Fixed · RHSA-2011:1253
Red Hat Enterprise Linux 4
kernel
Affected
Red Hat Enterprise MRG 1
kernel-rt
Affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel-0:2.6.18-274.17.1.el5 | Fixed | RHSA-2012:0007 |
| 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-rt31.75.el6rt | Fixed | RHSA-2011:1253 |
| Red Hat Enterprise Linux 4 | kernel | Affected | n/a |
| Red Hat Enterprise MRG 1 | kernel-rt | Affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
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. This has been addressed in Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG via RHSA-2012:0007, RHSA-2011:1530 and RHSA-2011:1253 respectively.
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:P/I:P/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 (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.92% (0.00923) | 58.96th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.92% (0.00923) | 55.55th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.55% (0.00550) | 66.00th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00044) | 12.25th | v3 (v2023.03.01) |
| Jun 20, 2024 | 0.04% (0.00044) | 10.48th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00044) | 8.45th | v3 (v2023.03.01) |
| Mar 6, 2023 | 3.22% (0.03220) | 84.21th | v2 (v2022.01.01) |
| Apr 1, 2022 | 3.22% (0.03220) | 82.61th | v2 (v2022.01.01) |
| Feb 4, 2022 | 3.22% (0.03220) | 65.30th | v2 (v2022.01.01) |
References (19)
- http://openwall.com/lists/oss-security/2011/02/24/18 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://openwall.com/lists/oss-security/2011/02/25/2 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://seclists.org/fulldisclosure/2011/Jan/421 mailing-listx_refsource_FULLDISCExploitMailing ListThird Party Advisory
- http://secunia.com/advisories/43496 third-party-advisoryx_refsource_SECUNIAThird Party Advisory
- http://securityreason.com/securityalert/8107 third-party-advisoryx_refsource_SREASONThird Party Advisory
- http://www.halfdog.net/Security/2011/SuidBinariesAndProcInterface/ x_refsource_MISCExploitThird Party Advisory
- http://www.securityfocus.com/bid/46567 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2011-1020 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=680358 Issue Tracking
- https://exchange.xforce.ibmcloud.com/vulnerabilities/65693 vdb-entryx_refsource_XFThird Party AdvisoryVDB Entry
- https://lkml.org/lkml/2011/2/10/21 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://lkml.org/lkml/2011/2/7/368 mailing-listx_refsource_MLISTExploitMailing ListThird Party Advisory
- https://lkml.org/lkml/2011/2/7/404 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://lkml.org/lkml/2011/2/7/414 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://lkml.org/lkml/2011/2/7/466 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://lkml.org/lkml/2011/2/7/474 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://lkml.org/lkml/2011/2/9/417 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2011-1020
- https://www.cve.org/CVERecord?id=CVE-2011-1020
| Link | Providers | Tags |
|---|---|---|
| http://openwall.com/lists/oss-security/2011/02/24/18 | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| http://openwall.com/lists/oss-security/2011/02/25/2 | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| http://seclists.org/fulldisclosure/2011/Jan/421 | mailing-listx_refsource_FULLDISCExploitMailing ListThird Party Advisory | |
| http://secunia.com/advisories/43496 | third-party-advisoryx_refsource_SECUNIAThird Party Advisory | |
| http://securityreason.com/securityalert/8107 | third-party-advisoryx_refsource_SREASONThird Party Advisory | |
| http://www.halfdog.net/Security/2011/SuidBinariesAndProcInterface/ | x_refsource_MISCExploitThird Party Advisory | |
| http://www.securityfocus.com/bid/46567 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| https://access.redhat.com/security/cve/CVE-2011-1020 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=680358 | Issue Tracking | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/65693 | vdb-entryx_refsource_XFThird Party AdvisoryVDB Entry | |
| https://lkml.org/lkml/2011/2/10/21 | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| https://lkml.org/lkml/2011/2/7/368 | mailing-listx_refsource_MLISTExploitMailing ListThird Party Advisory | |
| https://lkml.org/lkml/2011/2/7/404 | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| https://lkml.org/lkml/2011/2/7/414 | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| https://lkml.org/lkml/2011/2/7/466 | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| https://lkml.org/lkml/2011/2/7/474 | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| https://lkml.org/lkml/2011/2/9/417 | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2011-1020 | ||
| https://www.cve.org/CVERecord?id=CVE-2011-1020 |
Change history (0)
No recorded changes yet.