kernel: dns_resolver upcall security issue
Published Sep 8, 2010
7.8
HIGHCVSS 3.1
EPSS 0.42%
Description
The DNS resolution functionality in the CIFS implementation in the Linux kernel before 2.6.35, when CONFIG_CIFS_DFS_UPCALL is enabled, relies on a user's keyring for the dns_resolver upcall in the cifs.upcall userspace helper, which allows local users to spoof the results of DNS queries and perform arbitrary CIFS mounts via vectors involving an add_key call, related to a "cache stuffing" issue and MS-DFS referrals.
Affected products
No data.
Configuration 1
- < 2.6.35
Configuration 3
- 6.06
- 8.04
- 9.04
- 9.10
- 10.04
- 10.10
Configuration 4
- 11
- 11
No data.
Red Hat Enterprise Linux 5
kernel-0:2.6.18-194.11.1.el5
Fixed · RHSA-2010:0610
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel-0:2.6.18-194.11.1.el5 | Fixed | RHSA-2010:0610 |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 3, 4, and Red Hat Enterprise MRG as they did not include support for the upcall mechanism for the Common Internet File System (CIFS). This issue was addressed in Red Hat Enterprise Linux 5 via https://rhn.redhat.com/errata/RHSA-2010-0723.html.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 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 (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 0.42% (0.00423) | 34.38th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.42% (0.00423) | 33.60th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.05% (0.00054) | 14.13th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.05% (0.00052) | 22.07th | v3 (v2023.03.01) |
| Jun 13, 2024 | 0.05% (0.00052) | 20.16th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.05% (0.00052) | 18.13th | 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) |
No CWE recorded.
References (16)
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=4c0c03ca54f72fdd5912516ad0a23ec5cf01bda7 x_refsource_CONFIRM
- http://lists.opensuse.org/opensuse-security-announce/2010-09/msg00004.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://marc.info/?l=oss-security&m=128072090331700&w=2 mailing-listx_refsource_MLISTMailing ListPatchThird Party Advisory
- http://marc.info/?l=oss-security&m=128078387328921&w=2 mailing-listx_refsource_MLISTMailing ListPatchThird Party Advisory
- http://marc.info/?l=oss-security&m=128080755321157&w=2 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://secunia.com/advisories/43315 third-party-advisoryx_refsource_SECUNIABroken Link
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.35 x_refsource_CONFIRMBroken Link
- http://www.mandriva.com/security/advisories?name=MDVSA-2010:172 vendor-advisoryx_refsource_MANDRIVABroken Link
- http://www.redhat.com/support/errata/RHSA-2010-0610.html vendor-advisoryx_refsource_REDHATBroken Link
- http://www.securityfocus.com/archive/1/516397/100/0/threaded mailing-listx_refsource_BUGTRAQThird Party AdvisoryVDB Entry
- http://www.ubuntu.com/usn/USN-1000-1 vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- http://www.vmware.com/security/advisories/VMSA-2011-0003.html x_refsource_CONFIRMPatchThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2010-2524 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=612166 x_refsource_CONFIRMIssue TrackingPatchThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2010-2524
- https://www.cve.org/CVERecord?id=CVE-2010-2524
Change history (0)
No recorded changes yet.