kernel: Null pointer dereference in search_keyring
Published Mar 31, 2017
7.8
HIGHCVSS 3.0
EPSS 0.41%
Description
The KEYS subsystem in the Linux kernel before 3.18 allows local users to gain privileges or cause a denial of service (NULL pointer dereference and system crash) via vectors involving a NULL value for a certain match field, related to the keyring_search_iterator function in keyring.c.
Affected products
No data.
- ≤ 3.17.8
No data.
Red Hat Enterprise Linux 6
kernel-0:2.6.32-754.33.1.el6
Fixed · RHSA-2020:3548
Red Hat Enterprise Linux 6.6 Advanced Update Support
kernel-0:2.6.32-504.84.1.el6
Fixed · RHSA-2020:3836
Red Hat Enterprise Linux 7
kernel-0:3.10.0-693.el7
Fixed · RHSA-2017:1842
Red Hat Enterprise Linux 7
kernel-rt-0:3.10.0-693.rt56.617.el7
Fixed · RHSA-2017:2077
Red Hat Enterprise Linux 7.3 Extended Update Support
kernel-0:3.10.0-514.28.1.el7
Fixed · RHSA-2017:2437
Red Hat Enterprise MRG 2
kernel-rt-1:3.10.0-514.rt56.231.el6rt
Fixed · RHSA-2017:2444
Red Hat Enterprise Linux 5
kernel
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | kernel-0:2.6.32-754.33.1.el6 | Fixed | RHSA-2020:3548 |
| Red Hat Enterprise Linux 6.6 Advanced Update Support | kernel-0:2.6.32-504.84.1.el6 | Fixed | RHSA-2020:3836 |
| Red Hat Enterprise Linux 7 | kernel-0:3.10.0-693.el7 | Fixed | RHSA-2017:1842 |
| Red Hat Enterprise Linux 7 | kernel-rt-0:3.10.0-693.rt56.617.el7 | Fixed | RHSA-2017:2077 |
| Red Hat Enterprise Linux 7.3 Extended Update Support | kernel-0:3.10.0-514.28.1.el7 | Fixed | RHSA-2017:2437 |
| Red Hat Enterprise MRG 2 | kernel-rt-1:3.10.0-514.rt56.231.el6rt | Fixed | RHSA-2017:2444 |
| Red Hat Enterprise Linux 5 | kernel | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 as the code which can trigger the flaw is not present in the products listed. This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 6, 7 and MRG-2. Future Linux kernel updates for the respective releases might address this issue.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AV:L/AC:L/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 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (14 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.41% (0.00408) | 32.61th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.41% (0.00408) | 32.24th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.07% (0.00074) | 19.83th | 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) |
| Feb 3, 2022 | 1.52% (0.01516) | 33.38th | v1 |
| Jan 6, 2022 | 1.52% (0.01516) | 32.67th | v1 |
| Sep 1, 2021 | 1.52% (0.01516) | 72.58th | v1 |
| Apr 14, 2021 | 1.52% (0.01516) | 0.00th | v1 |
References (13)
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c06cfb08b88dfbe13be44a69ae2fdc3a7c902d81 x_refsource_CONFIRMIssue TrackingPatchThird Party Advisory
- http://www.securityfocus.com/bid/97258 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2017:1842 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2017:2077 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2017:2437 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2017:2444 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2017-2647 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1428353 x_refsource_CONFIRMIssue TrackingPatch
- https://github.com/torvalds/linux/commit/c06cfb08b88dfbe13be44a69ae2fdc3a7c902d81 x_refsource_CONFIRMIssue TrackingPatchThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2017-2647
- https://usn.ubuntu.com/3849-1/ vendor-advisoryx_refsource_UBUNTU
- https://usn.ubuntu.com/3849-2/ vendor-advisoryx_refsource_UBUNTU
- https://www.cve.org/CVERecord?id=CVE-2017-2647
Change history (0)
No recorded changes yet.