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NVD / CVE Program· CNA Linux

CVE-2023-53189: ipv6/addrconf: fix a potential refcount underflow for idev

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: 0.16% (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 Linux 06a0716949c22e2aefb648526580671197151acc, 1f656e483eb4733d62f18dfb206a49b78f60f495, 2ad31ce40e8182860b631e37209e93e543790b7c.
  • Severity is disputed: the assigning authority (CNA) scores it 7.8, NVD 5.5.

Low priority for now. Upgrade to Linux Linux 06a0716949c22e2aefb648526580671197151acc, 1f656e483eb4733d62f18dfb206a49b78f60f495, 2ad31ce40e8182860b631e37209e93e543790b7c 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: ipv6/addrconf: fix a potential refcount underflow for idev Now in addrconf_mod_rs_timer(), reference idev depends on whether rs_timer is not pending. Then modify rs_timer timeout. There is a time gap in [1], during which if the pending rs_timer becomes not pending. It will miss to hold idev, but the rs_timer is activated. Thus rs_timer callback function addrconf_rs_timer() will be executed and put idev later without holding idev. A refcount underflow issue for idev can be caused by this. if (!timer_pending(&idev->rs_timer)) in6_dev_hold(idev); <--------------[1] mod_timer(&idev->rs_timer, jiffies + when); To fix the issue, hold idev if mod_timer() return 0.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Sep 15, 2025
Updated
Oct 15, 2026
EPSS
0.1% · 6th 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 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.5
CNA · Linux
7.8
2.3 point gap

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

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-2023-53189

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 kernel3.10.105 and later · before 4.14.322
  • linux linux kernel4.15 and later · before 4.19.291
  • linux linux kernel4.20 and later · before 5.4.251
  • linux linux kernel5.5 and later · before 5.10.188
  • linux linux kernel5.11 and later · before 5.15.121
  • linux linux kernel5.16 and later · before 6.1.40
  • linux linux kernel6.2 and later · before 6.4.5
  • linux linux kernel6.5

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

    • 973d5956f754cfc306f5e274d71503498f4b0324, 3.11affected
    • b7b1bfce0bb68bd8f6e62a28295922785cc63781 and later · before c6395e32935d35e6f935e7caf1c2dac5a95943b4affected · git
    • b7b1bfce0bb68bd8f6e62a28295922785cc63781 and later · before df62fdcd004afa72ecbed0e862ebb983acd3aa57affected · git
    • b7b1bfce0bb68bd8f6e62a28295922785cc63781 and later · before c7eeba47058532f6077d6a658e38b6698f6ae71aaffected · git
    • b7b1bfce0bb68bd8f6e62a28295922785cc63781 and later · before 2ad31ce40e8182860b631e37209e93e543790b7caffected · git
    • b7b1bfce0bb68bd8f6e62a28295922785cc63781 and later · before 82abd1c37d3bf2a2658b34772c17a25a6f9cca42affected · git
    • b7b1bfce0bb68bd8f6e62a28295922785cc63781 and later · before 436b7cc7eae7851c184b671ed7a4a64c750b86f7affected · git
    • b7b1bfce0bb68bd8f6e62a28295922785cc63781 and later · before 1f656e483eb4733d62f18dfb206a49b78f60f495affected · git
    • b7b1bfce0bb68bd8f6e62a28295922785cc63781 and later · before 06a0716949c22e2aefb648526580671197151accaffected · git
    • 3.10.105 and later · before 3.11affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.52-16.1.52-1
Debian:13linuxbefore 6.4.11-16.4.11-1

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-2023-53184Sep 15, 2025 · arm64/sme: Set new vector length before reallocating
    31Monitor
  • ← EarlierCVE-2023-53186Sep 15, 2025 · skbuff: Fix a race between coalescing and releasing SKBs
    18Monitor
  • Later →CVE-2022-50303Sep 15, 2025 · drm/amdkfd: Fix double release compute pasid
    31Monitor

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 Linux06a0716949c22e2aefb648526580671197151accVendor (CNA)
Linux Linux1f656e483eb4733d62f18dfb206a49b78f60f495Vendor (CNA)
Linux Linux2ad31ce40e8182860b631e37209e93e543790b7cVendor (CNA)
Linux Linux3.11Vendor (CNA)
Linux Linux436b7cc7eae7851c184b671ed7a4a64c750b86f7Vendor (CNA)
Linux Linux82abd1c37d3bf2a2658b34772c17a25a6f9cca42Vendor (CNA)
Linux Linuxc6395e32935d35e6f935e7caf1c2dac5a95943b4Vendor (CNA)
Linux Linuxc7eeba47058532f6077d6a658e38b6698f6ae71aVendor (CNA)
Linux Linuxdf62fdcd004afa72ecbed0e862ebb983acd3aa57Vendor (CNA)
debian:linux6.1.52-1 · Debian:12Package 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.

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.

  • CVE-2026-53176283 days apartIB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN
    39Monitor
  • CVE-2026-63940307 days apartKVM: SEV: Ignore Port I/O requests of length '0'
    37Monitor
  • CVE-2024-26828516 days apartcifs: fix underflow in parse_server_interfaces()
    37Monitor
  • CVE-2026-43187233 days apartxfs: delete attr leaf freemap entries when empty
    35Monitor
  • CVE-2026-53178283 days apartstaging: rtl8723bs: rtw_mlme: add bounds checks before ie_length subtraction
    32Monitor
  • CVE-2026-31656221 days apartdrm/i915/gt: fix refcount underflow in intel_engine_park_heartbeat
    31Monitor

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

Weakness class (CWE)

CWE-191 · Integer Underflow (Wrap or Wraparound)

CVSS vector

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

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

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

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

References

Show all references (7 more)

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

All records