kernel: User triggerable crash from race between key read and rey revoke
Published Feb 8, 2016
5.5
MEDIUMCVSS 3.0
EPSS 0.41%
Description
The keyctl_read_key function in security/keys/keyctl.c in the Linux kernel before 4.3.4 does not properly use a semaphore, which allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via a crafted application that leverages a race condition between keyctl_revoke and keyctl_read calls.
Affected products
No data.
- ≤ 4.3.3
No data.
Red Hat Enterprise Linux 5
kernel
Will not fix
Red Hat Enterprise Linux 6
kernel
Will not fix
Red Hat Enterprise Linux 7
kernel
Will not fix
Red Hat Enterprise Linux 7
kernel-rt
Will not fix
Red Hat Enterprise MRG 2
realtime-kernel
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | kernel | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | kernel | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Will not fix | n/a |
| Red Hat Enterprise MRG 2 | realtime-kernel | Will not fix | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue affects the Linux kernels as shipped with Red Hat Enterprise Linux 5,6 and 7 and may be addressed in a future update.
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:N/I:N/A:H
AV:L/AC:L/Au:N/C:N/I:N/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
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 | 0.41% (0.00412) | 33.05th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.41% (0.00412) | 32.61th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.07% (0.00067) | 18.04th | 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 (19)
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b4a1b4f5047e4f54e194681125c74c0aa64d637d x_refsource_CONFIRMVendor Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00094.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00045.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00038.html vendor-advisoryx_refsource_SUSE
- http://www.debian.org/security/2016/dsa-3434 vendor-advisoryx_refsource_DEBIAN
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.3.4 x_refsource_CONFIRMVendor Advisory
- http://www.securityfocus.com/bid/79903 vdb-entryx_refsource_BID
- http://www.ubuntu.com/usn/USN-2888-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-2890-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-2890-2 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-2890-3 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-2911-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-2911-2 vendor-advisoryx_refsource_UBUNTU
- https://access.redhat.com/security/cve/CVE-2015-7550 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1291197 x_refsource_CONFIRMIssue Tracking
- https://github.com/torvalds/linux/commit/b4a1b4f5047e4f54e194681125c74c0aa64d637d x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2015-7550
- https://security-tracker.debian.org/tracker/CVE-2015-7550 x_refsource_CONFIRM
- https://www.cve.org/CVERecord?id=CVE-2015-7550
Change history (0)
No recorded changes yet.