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NVD / CVE Program· CNA mitre

CVE-2023-33203: The Linux kernel before 6.2.9 has a race condition and resultant use-after-free in drivers/net/ethernet/qualcomm/emac/emac.c if a physically

Noroxi assessment

Priority: Monitor (action score 25/100)

  • 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: 0.35% (FIRST EPSS).
  • Physical access to the device is required. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: cbl2 kernel 5.15.112.1-2 on CBL Mariner 2.0 5.15.112.1-2; cm1 kernel 5.10.181.1-1 on CBL Mariner 1.0 5.10.181.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to cbl2 kernel 5.15.112.1-2 on CBL Mariner 2.0 5.15.112.1-2; cm1 kernel 5.10.181.1-1 on CBL Mariner 1.0 5.10.181.1-1 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

The Linux kernel before 6.2.9 has a race condition and resultant use-after-free in drivers/net/ethernet/qualcomm/emac/emac.c if a physically proximate attacker unplugs an emac based device.

MediumCVSS 6.4 · v3.1—No exploit Fix available
Published
May 18, 2023
Updated
Jun 17, 2026
EPSS
0.3% · 28th percentile

Report tools

JSON

Action score

25

Monitor

Low priority for now.

CVSS
25 / 40 · 6.4 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

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-2023-33203

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
redhatenterprise linux

Affected versions

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

  • linux linux kernelbefore 6.2.9
  • redhat enterprise linux8.0
  • redhat enterprise linux9.0

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.25-16.1.25-1
Red Hat:rhel_eus:8.8::baseosbpftoolbefore 0:4.18.0-477.43.1.el8_80:4.18.0-477.43.1.el8_8
Red Hat:rhel_eus:8.8::baseosbpftool-debuginfobefore 0:4.18.0-477.43.1.el8_80:4.18.0-477.43.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernelbefore 0:4.18.0-477.43.1.el8_80:4.18.0-477.43.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-abi-stablelistsbefore 0:4.18.0-477.43.1.el8_80:4.18.0-477.43.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-corebefore 0:4.18.0-477.43.1.el8_80:4.18.0-477.43.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-debugbefore 0:4.18.0-477.43.1.el8_80:4.18.0-477.43.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-debug-corebefore 0:4.18.0-477.43.1.el8_80:4.18.0-477.43.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-debug-debuginfobefore 0:4.18.0-477.43.1.el8_80:4.18.0-477.43.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-debug-develbefore 0:4.18.0-477.43.1.el8_80:4.18.0-477.43.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-debug-modulesbefore 0:4.18.0-477.43.1.el8_80:4.18.0-477.43.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-debug-modules-extrabefore 0:4.18.0-477.43.1.el8_80:4.18.0-477.43.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-debuginfobefore 0:4.18.0-477.43.1.el8_80:4.18.0-477.43.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-debuginfo-common-aarch64before 0:4.18.0-477.43.1.el8_80:4.18.0-477.43.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-debuginfo-common-ppc64lebefore 0:4.18.0-477.43.1.el8_80:4.18.0-477.43.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-debuginfo-common-s390xbefore 0:4.18.0-477.43.1.el8_80:4.18.0-477.43.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-debuginfo-common-x86_64before 0:4.18.0-477.43.1.el8_80:4.18.0-477.43.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-develbefore 0:4.18.0-477.43.1.el8_80:4.18.0-477.43.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-docbefore 0:4.18.0-477.43.1.el8_80:4.18.0-477.43.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-modulesbefore 0:4.18.0-477.43.1.el8_80:4.18.0-477.43.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-modules-extrabefore 0:4.18.0-477.43.1.el8_80:4.18.0-477.43.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-toolsbefore 0:4.18.0-477.43.1.el8_80:4.18.0-477.43.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-tools-debuginfobefore 0:4.18.0-477.43.1.el8_80:4.18.0-477.43.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-tools-libsbefore 0:4.18.0-477.43.1.el8_80:4.18.0-477.43.1.el8_8

+11

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-2023-2124May 15, 2023 · An out-of-bounds memory access flaw was found in the Linux kernel’s XFS file system in how a user restores an XFS image after failure (with
    31Monitor
  • ← EarlierCVE-2023-1859May 17, 2023 · A use-after-free flaw was found in xen_9pfs_front_removet in net/9p/trans_xen.c in Xen transport for 9pfs in the Linux Kernel.
    18Monitor
  • Later →CVE-2023-1195May 18, 2023 · A use-after-free flaw was found in reconn_set_ipaddr_from_hostname in fs/cifs/connect.c in the Linux kernel.
    22Monitor

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
cbl2 kernel 5.15.112.1-2 on CBL Mariner 2.05.15.112.1-2 · CBL-Mariner ReleasesMicrosoft (MSRC)
cm1 kernel 5.10.181.1-1 on CBL Mariner 1.05.10.181.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.25-1 · Debian:12Package registry (OSV)
red hat:bpftool0:4.18.0-477.43.1.el8_8 · Red Hat:rhel_eus:8.8::baseosPackage registry (OSV)
red hat:bpftool-debuginfo0:4.18.0-477.43.1.el8_8 · Red Hat:rhel_eus:8.8::baseosPackage registry (OSV)
red hat:kernel0:4.18.0-477.43.1.el8_8 · Red Hat:rhel_eus:8.8::baseosPackage registry (OSV)
red hat:kernel-abi-stablelists0:4.18.0-477.43.1.el8_8 · Red Hat:rhel_eus:8.8::baseosPackage registry (OSV)
red hat:kernel-core0:4.18.0-477.43.1.el8_8 · Red Hat:rhel_eus:8.8::baseosPackage registry (OSV)
red hat:kernel-debug0:4.18.0-477.43.1.el8_8 · Red Hat:rhel_eus:8.8::baseosPackage registry (OSV)
red hat:kernel-debug-core0:4.18.0-477.43.1.el8_8 · Red Hat:rhel_eus:8.8::baseosPackage registry (OSV)
red hat:kernel-debug-debuginfo0:4.18.0-477.43.1.el8_8 · Red Hat:rhel_eus:8.8::baseosPackage registry (OSV)
red hat:kernel-debug-devel0:4.18.0-477.43.1.el8_8 · Red Hat:rhel_eus:8.8::baseosPackage registry (OSV)
red hat:kernel-debug-modules0:4.18.0-477.43.1.el8_8 · Red Hat:rhel_eus:8.8::baseosPackage registry (OSV)
red hat:kernel-debug-modules-extra0:4.18.0-477.43.1.el8_8 · Red Hat:rhel_eus:8.8::baseosPackage registry (OSV)
red hat:kernel-debuginfo0:4.18.0-477.43.1.el8_8 · Red Hat:rhel_eus:8.8::baseosPackage 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.

No credits in the CNA record.

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Physical access to the device is required.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Physical
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSS vector

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

nvd-primary

Attack context

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

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

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

References

Show all references (3 more)

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

All records