kernel: local privilege escalation via /sys/kernel/debug/acpi/custom_method
Published Dec 22, 2010
6.9
MEDIUMCVSS 2.0
EPSS 2.20%
Description
The ACPI subsystem in the Linux kernel before 2.6.36.2 uses 0222 permissions for the debugfs custom_method file, which allows local users to gain privileges by placing a custom ACPI method in the ACPI interpreter tables, related to the acpi_debugfs_init function in drivers/acpi/debugfs.c.
Affected products
No data.
Configuration 1
- < 2.6.36.2
Configuration 2
- 11.3
- 11
No data.
MRG for RHEL-5
kernel-rt-0:2.6.33.7-rt29.55.el5rt
Fixed · RHSA-2011:0330
| Product | Package | State | Advisory |
|---|---|---|---|
| MRG for RHEL-5 | kernel-rt-0:2.6.33.7-rt29.55.el5rt | Fixed | RHSA-2011:0330 |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the version of Linux kernel as shipped with Red Hat Enterprise Linux 4, 5, and 6 as they did not include upstream commit a1a541d8 and a25ee920 that introduced the problem. This has been addressed in Red Hat Enterprise MRG via https://rhn.redhat.com/errata/RHSA-2011-0330.html. Notes: This requires debugfs to be mounted on a local system in order to have access to the custom_method file. Debugfs is not mounted by default. You need to run "mount -t debugfs nodev /sys/kernel/debug" as root first.
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:M/Au:N/C:C/I:C/A:C
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 2, 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 (20 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 2.20% (0.02203) | 81.92th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.20% (0.02203) | 80.16th | v5 (v2026.06.15) |
| May 15, 2026 | 8.11% (0.08114) | 92.24th | v4 (v2025.03.14) |
| Mar 17, 2026 | 5.94% (0.05940) | 90.52th | v4 (v2025.03.14) |
| Jan 15, 2026 | 7.33% (0.07329) | 91.42th | v4 (v2025.03.14) |
| Nov 7, 2025 | 8.41% (0.08410) | 91.93th | v4 (v2025.03.14) |
| Oct 6, 2025 | 7.39% (0.07389) | 91.35th | v4 (v2025.03.14) |
| Aug 31, 2025 | 12.10% (0.12099) | 93.55th | v4 (v2025.03.14) |
| Jun 23, 2025 | 26.03% (0.26030) | 95.99th | v4 (v2025.03.14) |
| Apr 10, 2025 | 37.91% (0.37910) | 96.91th | v4 (v2025.03.14) |
| Mar 30, 2025 | 41.15% (0.41152) | 97.11th | v4 (v2025.03.14) |
| Mar 29, 2025 | 36.14% (0.36141) | 95.55th | v4 (v2025.03.14) |
| Mar 17, 2025 | 41.15% (0.41152) | 97.07th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00044) | 11.89th | v3 (v2023.03.01) |
| Jul 2, 2024 | 0.04% (0.00044) | 10.25th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00044) | 8.24th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.55% (0.01547) | 74.98th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.55% (0.01547) | 74.94th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.55% (0.01547) | 72.92th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.55% (0.01547) | 51.82th | v2 (v2022.01.01) |
References (16)
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=ed3aada1bf34c5a9e98af167f125f8a740fc726a x_refsource_CONFIRM
- http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00000.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2011-02/msg00000.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://openwall.com/lists/oss-security/2010/12/15/3 mailing-listx_refsource_MLISTMailing ListPatchThird Party Advisory
- http://openwall.com/lists/oss-security/2010/12/15/7 mailing-listx_refsource_MLISTMailing ListPatchThird Party Advisory
- http://secunia.com/advisories/42778 third-party-advisoryx_refsource_SECUNIAThird Party Advisory
- http://www.exploit-db.com/exploits/15774/ exploitx_refsource_EXPLOIT-DBThird Party AdvisoryVDB Entry
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.36.2 x_refsource_CONFIRMBroken Link
- http://www.securityfocus.com/bid/45408 vdb-entryx_refsource_BIDExploitThird Party AdvisoryVDB Entry
- http://www.vupen.com/english/advisories/2011/0012 vdb-entryx_refsource_VUPENThird Party Advisory
- http://www.vupen.com/english/advisories/2011/0298 vdb-entryx_refsource_VUPENThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2010-4347 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=663542 x_refsource_CONFIRMIssue TrackingPatchThird Party Advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/64155 vdb-entryx_refsource_XFThird Party AdvisoryVDB Entry
- https://nvd.nist.gov/vuln/detail/CVE-2010-4347
- https://www.cve.org/CVERecord?id=CVE-2010-4347
Change history (0)
No recorded changes yet.