Skip to content
Noroxi
NVD / CVE Program· CNA Linux

CVE-2023-52618: block/rnbd-srv: Check for unlikely string overflow

Noroxi assessment

Priority: Monitor (action score 21/100)

  • 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: 0.73% (FIRST EPSS); higher than 54.7% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 5b9ea86e662035a886ccb5c76d56793cba618827, 95bc866c11974d3e4a9d922275ea8127ff809cf7, 9e4bf6a08d1e127bcc4bd72557f2dfafc6bc7f41.
  • Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 5b9ea86e662035a886ccb5c76d56793cba618827, 95bc866c11974d3e4a9d922275ea8127ff809cf7, 9e4bf6a08d1e127bcc4bd72557f2dfafc6bc7f41 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

In the Linux kernel, the following vulnerability has been resolved: block/rnbd-srv: Check for unlikely string overflow Since "dev_search_path" can technically be as large as PATH_MAX, there was a risk of truncation when copying it and a second string into "full_path" since it was also PATH_MAX sized. The W=1 builds were reporting this warning: drivers/block/rnbd/rnbd-srv.c: In function 'process_msg_open.isra': drivers/block/rnbd/rnbd-srv.c:616:51: warning: '%s' directive output may be truncated writing up to 254 bytes into a region of size between 0 and 4095 [-Wformat-truncation=] 616 | snprintf(full_path, PATH_MAX, "%s/%s", | ^~ In function 'rnbd_srv_get_full_path', inlined from 'process_msg_open.isra' at drivers/block/rnbd/rnbd-srv.c:721:14: drivers/block/rnbd/rnbd-srv.c:616:17: note: 'snprintf' output between 2 and 4351 bytes into a destination of size 4096 616 | snprintf(full_path, PATH_MAX, "%s/%s", | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 617 | dev_search_path, dev_name); | ~~~~~~~~~~~~~~~~~~~~~~~~~~ To fix this, unconditionally check for truncation (as was already done for the case where "%SESSNAME%" was present).

MediumCVSS 5.3 · v3.1—No exploit Fix available
Published
Mar 18, 2024
Updated
Jun 17, 2026
EPSS
0.7% · 54th percentile
CWE
—

Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

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-2023-52618

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

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for linux records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

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.

We use this product, ask for help

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
debiandebian linux

Affected versions

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

  • debian debian linux10.0
  • linux linux kernel5.8 and later · before 5.10.210
  • linux linux kernel5.11 and later · before 5.15.149
  • linux linux kernel5.16 and later · before 6.1.77
  • linux linux kernel6.2 and later · before 6.6.16
  • linux linux kernel6.7 and later · before 6.7.4

Versions reported by the vendor

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

  • Linux Linux

    • 5.8affected
    • 2de6c8de192b9341ffa5e84afe1ce6196d4eef41 and later · before 95bc866c11974d3e4a9d922275ea8127ff809cf7affected · git
    • 2de6c8de192b9341ffa5e84afe1ce6196d4eef41 and later · before f6abd5e17da33eba15df2bddc93413e76c2b55f7affected · git
    • 2de6c8de192b9341ffa5e84afe1ce6196d4eef41 and later · before af7bbdac89739e2e7380387fda598848d3b7010faffected · git
    • 2de6c8de192b9341ffa5e84afe1ce6196d4eef41 and later · before 5b9ea86e662035a886ccb5c76d56793cba618827affected · git
    • 2de6c8de192b9341ffa5e84afe1ce6196d4eef41 and later · before a2c6206f18104fba7f887bf4dbbfe4c41adc4339affected · git
    • 2de6c8de192b9341ffa5e84afe1ce6196d4eef41 and later · before 9e4bf6a08d1e127bcc4bd72557f2dfafc6bc7f41affected · git
    • before 5.8not affected · semver
    • 5.10.210 and later · up to and including 5.10.*not affected · semver
    • 5.15.149 and later · up to and including 5.15.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.82-16.1.82-1
Debian:13linuxbefore 6.7.7-16.7.7-1
openSUSE:Leap 15.6dtb-aarch64before 6.4.0-150600.23.7.16.4.0-150600.23.7.1
openSUSE:Leap 15.6kernel-64kbbefore 6.4.0-150600.23.7.36.4.0-150600.23.7.3
openSUSE:Leap 15.6kernel-azurebefore 6.4.0-150600.8.5.46.4.0-150600.8.5.4
openSUSE:Leap 15.6kernel-debugbefore 6.4.0-150600.23.7.36.4.0-150600.23.7.3
openSUSE:Leap 15.6kernel-defaultbefore 6.4.0-150600.23.7.36.4.0-150600.23.7.3
openSUSE:Leap 15.6kernel-default-basebefore 6.4.0-150600.23.7.3.150600.12.2.76.4.0-150600.23.7.3.150600.12.2.7
openSUSE:Leap 15.6kernel-docsbefore 6.4.0-150600.23.7.46.4.0-150600.23.7.4
openSUSE:Leap 15.6kernel-kvmsmallbefore 6.4.0-150600.23.7.36.4.0-150600.23.7.3
openSUSE:Leap 15.6kernel-obs-buildbefore 6.4.0-150600.23.7.36.4.0-150600.23.7.3
openSUSE:Leap 15.6kernel-obs-qabefore 6.4.0-150600.23.7.16.4.0-150600.23.7.1
openSUSE:Leap 15.6kernel-rtbefore 6.4.0-150600.10.5.16.4.0-150600.10.5.1
openSUSE:Leap 15.6kernel-rt_debugbefore 6.4.0-150600.10.5.16.4.0-150600.10.5.1
openSUSE:Leap 15.6kernel-sourcebefore 6.4.0-150600.23.7.26.4.0-150600.23.7.2
openSUSE:Leap 15.6kernel-source-azurebefore 6.4.0-150600.8.5.46.4.0-150600.8.5.4
openSUSE:Leap 15.6kernel-source-rtbefore 6.4.0-150600.10.5.16.4.0-150600.10.5.1
openSUSE:Leap 15.6kernel-symsbefore 6.4.0-150600.23.7.16.4.0-150600.23.7.1
openSUSE:Leap 15.6kernel-syms-azurebefore 6.4.0-150600.8.5.16.4.0-150600.8.5.1
openSUSE:Leap 15.6kernel-syms-rtbefore 6.4.0-150600.10.5.16.4.0-150600.10.5.1
openSUSE:Leap 15.6kernel-zfcpdumpbefore 6.4.0-150600.23.7.36.4.0-150600.23.7.3
SUSE:Linux Enterprise Live Patching 15 SP6kernel-livepatch-SLE15-SP6_Update_1before 1-150600.13.3.71-150600.13.3.7
SUSE:Linux Enterprise Live Patching 15 SP6kernel-livepatch-SLE15-SP6-RT_Update_1before 1-150600.1.5.11-150600.1.5.1
SUSE:Linux Enterprise Module for Basesystem 15 SP6kernel-64kbbefore 6.4.0-150600.23.7.36.4.0-150600.23.7.3

+20

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-2023-52616Mar 18, 2024 · crypto: lib/mpi - Fix unexpected pointer access in mpi_ec_init
    22Monitor
  • ← EarlierCVE-2023-52617Mar 18, 2024 · PCI: switchtec: Fix stdev_release() crash after surprise hot remove
    17Monitor
  • Later →CVE-2023-52619Mar 18, 2024 · pstore/ram: Fix crash when setting number of cpus to an odd number
    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
Linux Linux5b9ea86e662035a886ccb5c76d56793cba618827Vendor (CNA)
Linux Linux95bc866c11974d3e4a9d922275ea8127ff809cf7Vendor (CNA)
Linux Linux9e4bf6a08d1e127bcc4bd72557f2dfafc6bc7f41Vendor (CNA)
Linux Linuxa2c6206f18104fba7f887bf4dbbfe4c41adc4339Vendor (CNA)
Linux Linuxaf7bbdac89739e2e7380387fda598848d3b7010fVendor (CNA)
Linux Linuxf6abd5e17da33eba15df2bddc93413e76c2b55f7Vendor (CNA)
debian:linux6.1.82-1 · Debian:12Package registry (OSV)
opensuse:dtb-aarch646.4.0-150600.23.7.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-64kb6.4.0-150600.23.7.3 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-azure6.4.0-150600.8.5.4 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-debug6.4.0-150600.23.7.3 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default6.4.0-150600.23.7.3 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default-base6.4.0-150600.23.7.3.150600.12.2.7 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-docs6.4.0-150600.23.7.4 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-kvmsmall6.4.0-150600.23.7.3 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-build6.4.0-150600.23.7.3 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-qa6.4.0-150600.23.7.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-source-azure6.4.0-150600.8.5.4 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-syms-azure6.4.0-150600.8.5.1 · openSUSE:Leap 15.6Package registry (OSV)
suse:kernel-64kb6.4.0-150600.23.7.3 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package registry (OSV)
suse:kernel-azure6.4.0-150600.8.5.4 · SUSE:Linux Enterprise Module for Public Cloud 15 SP6Package registry (OSV)
suse:kernel-default6.4.0-150600.23.7.3 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package registry (OSV)
suse:kernel-default-base6.4.0-150600.23.7.3.150600.12.2.7 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package registry (OSV)
suse:kernel-docs6.4.0-150600.23.7.4 · SUSE:Linux Enterprise Module for Development Tools 15 SP6Package registry (OSV)
suse:kernel-livepatch-SLE15-SP6_Update_11-150600.13.3.7 · SUSE:Linux Enterprise Live Patching 15 SP6Package registry (OSV)
suse:kernel-obs-build6.4.0-150600.23.7.3 · SUSE:Linux Enterprise Module for Development Tools 15 SP6Package registry (OSV)
suse:kernel-source6.4.0-150600.23.7.2 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package registry (OSV)
suse:kernel-source-azure6.4.0-150600.8.5.4 · SUSE:Linux Enterprise Module for Public Cloud 15 SP6Package registry (OSV)
suse:kernel-syms6.4.0-150600.23.7.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP6Package registry (OSV)
suse:kernel-syms-azure6.4.0-150600.8.5.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP6Package registry (OSV)

+1

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.

No commit or PR link among the references.

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

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

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

Weakness class (CWE)

—

CVSS vector

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

nvd-secondary

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 (6 more)

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

All records