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NVD / CVE Program· CNA Google

CVE-2023-23586: Use after free in io_uring in the Linux Kernel

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.26% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: linux-5.10 (Debian:10) 5.10.162-1~deb10u1; linux (Debian:12) 5.14.6-1; dtb-aarch64 (openSUSE:Leap 15.4) 5.3.18-150300.59.124.1.

Low priority for now. Upgrade to linux-5.10 (Debian:10) 5.10.162-1~deb10u1; linux (Debian:12) 5.14.6-1; dtb-aarch64 (openSUSE:Leap 15.4) 5.3.18-150300.59.124.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Feb 17, 2023
Updated
Jun 17, 2026
EPSS
0.2% · 18th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.5
CNA · Google
5.5
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2023-23586

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel5.6 and later · before 5.10.161

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Google). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux Kernel

    • 5.6 and later · up to and including 5.10.161affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:10linux-5.10before 5.10.162-1~deb10u15.10.162-1~deb10u1
Debian:12linuxbefore 5.14.6-15.14.6-1
openSUSE:Leap 15.4dtb-aarch64before 5.3.18-150300.59.124.15.3.18-150300.59.124.1
SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSSkernel-default-basebefore 5.3.18-150200.24.154.1.150200.9.75.15.3.18-150200.24.154.1.150200.9.75.1
SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSSkernel-docsbefore 5.3.18-150200.24.154.25.3.18-150200.24.154.2
SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSSkernel-obs-buildbefore 5.3.18-150200.24.154.15.3.18-150200.24.154.1
SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSSkernel-preemptbefore 5.3.18-150200.24.154.15.3.18-150200.24.154.1
SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSSkernel-sourcebefore 5.3.18-150200.24.154.15.3.18-150200.24.154.1
SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSSkernel-symsbefore 5.3.18-150200.24.154.15.3.18-150200.24.154.1
SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOSkernel-64kbbefore 5.3.18-150300.59.124.15.3.18-150300.59.124.1
SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOSkernel-default-basebefore 5.3.18-150300.59.124.1.150300.18.72.15.3.18-150300.59.124.1.150300.18.72.1
SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOSkernel-docsbefore 5.3.18-150300.59.124.15.3.18-150300.59.124.1
SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOSkernel-obs-buildbefore 5.3.18-150300.59.124.15.3.18-150300.59.124.1
SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOSkernel-preemptbefore 5.3.18-150300.59.124.15.3.18-150300.59.124.1
SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOSkernel-sourcebefore 5.3.18-150300.59.124.15.3.18-150300.59.124.1
SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOSkernel-symsbefore 5.3.18-150300.59.124.15.3.18-150300.59.124.1
SUSE:Linux Enterprise Live Patching 15 SP2kernel-defaultbefore 5.3.18-150200.24.154.15.3.18-150200.24.154.1
SUSE:Linux Enterprise Live Patching 15 SP2kernel-livepatch-SLE15-SP2_Update_37before 1-150200.5.3.11-150200.5.3.1
SUSE:Linux Enterprise Live Patching 15 SP3kernel-defaultbefore 5.3.18-150300.59.124.15.3.18-150300.59.124.1
SUSE:Linux Enterprise Live Patching 15 SP3kernel-livepatch-SLE15-SP3_Update_33before 1-150300.7.3.11-150300.7.3.1
SUSE:Linux Enterprise Server 15 SP3-LTSSkernel-zfcpdumpbefore 5.3.18-150300.59.124.15.3.18-150300.59.124.1
SUSE:Real Time Module 15 SP3kernel-rtbefore 5.3.18-150300.130.15.3.18-150300.130.1
SUSE:Real Time Module 15 SP3kernel-rt_debugbefore 5.3.18-150300.130.15.3.18-150300.130.1
SUSE:Real Time Module 15 SP3kernel-source-rtbefore 5.3.18-150300.130.15.3.18-150300.130.1

+1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2023-25012Feb 1, 2023 · The Linux kernel through 6.1.9 has a Use-After-Free in bigben_remove in drivers/hid/hid-bigbenff.c via a crafted USB device because the LED
    18Monitor
  • ← EarlierCVE-2023-0615Feb 6, 2023 · A memory leak flaw and potential divide by zero and Integer overflow was found in the Linux kernel V4L2 and vivid test code functionality.
    22Monitor
  • Later →CVE-2023-26020Feb 17, 2023 · Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') in Crafter Studio
    28Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:linux5.14.6-1 · Debian:12Package registry (OSV)
debian:linux-5.105.10.162-1~deb10u1 · Debian:10Package registry (OSV)
opensuse:dtb-aarch645.3.18-150300.59.124.1 · openSUSE:Leap 15.4Package registry (OSV)
suse:kernel-64kb5.3.18-150300.59.124.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOSPackage registry (OSV)
suse:kernel-default5.3.18-150300.59.124.1 · SUSE:Linux Enterprise Live Patching 15 SP3Package registry (OSV)
suse:kernel-default-base5.3.18-150300.59.124.1.150300.18.72.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOSPackage registry (OSV)
suse:kernel-docs5.3.18-150300.59.124.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOSPackage registry (OSV)
suse:kernel-livepatch-SLE15-SP3_Update_331-150300.7.3.1 · SUSE:Linux Enterprise Live Patching 15 SP3Package registry (OSV)
suse:kernel-obs-build5.3.18-150300.59.124.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOSPackage registry (OSV)
suse:kernel-preempt5.3.18-150300.59.124.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOSPackage registry (OSV)
suse:kernel-rt5.3.18-150300.130.1 · SUSE:Real Time Module 15 SP3Package registry (OSV)
suse:kernel-rt_debug5.3.18-150300.130.1 · SUSE:Real Time Module 15 SP3Package registry (OSV)
suse:kernel-source5.3.18-150300.59.124.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOSPackage registry (OSV)
suse:kernel-source-rt5.3.18-150300.130.1 · SUSE:Real Time Module 15 SP3Package registry (OSV)
suse:kernel-syms5.3.18-150300.59.124.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOSPackage registry (OSV)
suse:kernel-syms-rt5.3.18-150300.130.1 · SUSE:Real Time Module 15 SP3Package registry (OSV)
suse:kernel-zfcpdump5.3.18-150300.59.124.1 · SUSE:Linux Enterprise Server 15 SP3-LTSSPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

nvd-primary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

c
free(dev->buf);/* ... another thread is still running ... */process(dev->buf);

Fixed

c
lock(&dev->lock);free(dev->buf);dev->buf = NULL;unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records