kernel: race condition in load_aout_binary() allows local users to bypass ASLR on setuid a.out programs
Published Apr 11, 2019
2.5
LOWCVSS 3.0
EPSS 0.50%
Description
The Linux kernel through 5.0.7, when CONFIG_IA32_AOUT is enabled and ia32_aout is loaded, allows local users to bypass ASLR on setuid a.out programs (if any exist) because install_exec_creds() is called too late in load_aout_binary() in fs/binfmt_aout.c, and thus the ptrace_may_access() check has a race condition when reading /proc/pid/stat. NOTE: the software maintainer disputes that this is a vulnerability because ASLR for a.out format executables has never been supported
Affected products
No data.
- ≤ 5.0.7
No data.
Red Hat Enterprise Linux 5
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel
Not affected
Red Hat Enterprise Linux 7
kernel-alt
Not affected
Red Hat Enterprise Linux 7
kernel-rt
Not affected
Red Hat Enterprise Linux 8
kernel
Not affected
Red Hat Enterprise Linux 8
kernel-rt
Not affected
Red Hat Enterprise MRG 2
kernel-rt
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-alt | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise MRG 2 | kernel-rt | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
AV:L/AC:M/Au:N/C:P/I:N/A:N
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 4, 2026.
Score over time
2021-2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (12 key points)
Flat stretches are collapsed. Showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 4, 2026 | 0.50% (0.00499) | 40.64th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.50% (0.00495) | 38.35th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.01% (0.00005) | 0.22th | 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) |
| Apr 1, 2022 | 1.28% (0.01282) | 65.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 4.80% (0.04804) | 74.65th | v2 (v2022.01.01) |
| Feb 3, 2022 | 6.15% (0.06151) | 81.36th | v1 |
| Jan 6, 2022 | 6.15% (0.06151) | 81.17th | v1 |
| Jan 5, 2022 | 1.44% (0.01440) | 72.03th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.44% (0.01440) | 0.00th | v1 |
References (16)
- http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00039.html vendor-advisoryx_refsource_SUSE
- http://www.openwall.com/lists/oss-security/2019/04/18/5 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2019/05/22/7 mailing-listx_refsource_MLIST
- http://www.securityfocus.com/bid/107887 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2019-11191 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1700007 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2019-11191
- https://usn.ubuntu.com/4006-1/ vendor-advisoryx_refsource_UBUNTU
- https://usn.ubuntu.com/4006-2/ vendor-advisoryx_refsource_UBUNTU
- https://usn.ubuntu.com/4007-1/ vendor-advisoryx_refsource_UBUNTU
- https://usn.ubuntu.com/4007-2/ vendor-advisoryx_refsource_UBUNTU
- https://usn.ubuntu.com/4008-1/ vendor-advisoryx_refsource_UBUNTU
- https://usn.ubuntu.com/4008-3/ vendor-advisoryx_refsource_UBUNTU
- https://www.cve.org/CVERecord?id=CVE-2019-11191
- https://www.openwall.com/lists/oss-security/2019/04/03/4 x_refsource_MISCExploitMailing ListThird Party Advisory
- https://www.openwall.com/lists/oss-security/2019/04/03/4/1 x_refsource_MISCExploitMailing ListThird Party Advisory
Change history (0)
No recorded changes yet.