5.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
1.7 Low
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:L/AC:L/Au:S/C:P/I:N/A:N
0.0004 Low
EPSS
Percentile
7.2%
Due to a vulnerability in the io_uring subsystem, it is possible to leak
kernel memory information to the user process. timens_install calls
current_is_single_threaded to determine if the current process is
single-threaded, but this call does not consider io_uring’s io_worker
threads, thus it is possible to insert a time namespace’s vvar page to
process’s memory space via a page fault. When this time namespace is
destroyed, the vvar page is also freed, but not removed from the process’
memory, and a next page allocated by the kernel will be still available
from the user-space process and can leak memory contents via this
(read-only) use-after-free vulnerability. We recommend upgrading past
version 5.10.161 or commit 788d0824269bef539fe31a785b1517882eafed93
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/io_uring
Author | Note |
---|---|
mdeslaur | possibly a dupe of CVE-2023-0240 |
sbeattie | according to linuxkernelcves, fixed by 4379bf8bd70b (“io_uring: remove io_identity”), but also they ave the CVE marked as rejected / withdrawn. This would also indicate it is a likely duplicate of CVE-2022-1786. |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-23586
git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/io_uring?h=linux-5.10.y&id=788d0824269bef539fe31a785b1517882eafed93
kernel.dance/#788d0824269bef539fe31a785b1517882eafed93
launchpad.net/bugs/cve/CVE-2023-23586
nvd.nist.gov/vuln/detail/CVE-2023-23586
security-tracker.debian.org/tracker/CVE-2023-23586
www.linuxkernelcves.com/cves/CVE-2022-20424
5.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
1.7 Low
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:L/AC:L/Au:S/C:P/I:N/A:N
0.0004 Low
EPSS
Percentile
7.2%