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NVD / CVE Program· CNA Linux

CVE-2023-53590: sctp: add a refcnt in sctp_stream_priorities to avoid a nested loop

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: 0.12% (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 03c3a5584a0a29821e59b7834635ce823050caaa, 5.10.173, 5.15.100.

Low priority for now. Upgrade to Linux Linux 03c3a5584a0a29821e59b7834635ce823050caaa, 5.10.173, 5.15.100 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: sctp: add a refcnt in sctp_stream_priorities to avoid a nested loop With this refcnt added in sctp_stream_priorities, we don't need to traverse all streams to check if the prio is used by other streams when freeing one stream's prio in sctp_sched_prio_free_sid(). This can avoid a nested loop (up to 65535 * 65535), which may cause a stuck as Ying reported: watchdog: BUG: soft lockup - CPU#23 stuck for 26s! [ksoftirqd/23:136] Call Trace: <TASK> sctp_sched_prio_free_sid+0xab/0x100 [sctp] sctp_stream_free_ext+0x64/0xa0 [sctp] sctp_stream_free+0x31/0x50 [sctp] sctp_association_free+0xa5/0x200 [sctp] Note that it doesn't need to use refcount_t type for this counter, as its accessing is always protected under the sock lock. v1->v2: - add a check in sctp_sched_prio_set to avoid the possible prio_head refcnt overflow.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Oct 4, 2025
Updated
Jun 17, 2026
EPSS
0.1% · 1th 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%

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

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • 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 kernel5.4.226 and later · before 5.4.235
  • linux linux kernel5.10.158 and later · before 5.10.173
  • linux linux kernel5.15.82 and later · before 5.15.100
  • linux linux kernel6.0.12 and later · before 6.1
  • linux linux kernel6.1.1 and later · before 6.1.18
  • linux linux kernel6.2 and later · before 6.2.5
  • linux linux kernel6.1

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

    • fa20f88271259d42ebe66f0a8c4c20199e888c99, 6.1affected
    • a7555681e50bdebed2c40ff7404ee73c2e932993 and later · before cec326443f01283ef68ea00c06ea073b1835a562affected · git
    • 176ee6c673ccd118e9392fd2dbb165423bdb99ca and later · before 8ee401f89cdb10f39098c0656d695b2bc4052100affected · git
    • 0dfb9a566327182387c90100ea54d8426cee8c67 and later · before bf5540cbd20e2dae2c81ab9b31deef41ef147d0aaffected · git
    • 9ed7bfc79542119ac0a9e1ce8a2a5285e43433e9 and later · before 03c3a5584a0a29821e59b7834635ce823050caaaaffected · git
    • 9ed7bfc79542119ac0a9e1ce8a2a5285e43433e9 and later · before 6d529928ea212127851a2df8c40d822237ca946baffected · git
    • 9ed7bfc79542119ac0a9e1ce8a2a5285e43433e9 and later · before 68ba44639537de6f91fe32783766322d41848127affected · git
    • 5.4.226 and later · before 5.4.235affected · semver
    • 5.10.158 and later · before 5.10.173affected · semver
    • 5.15.82 and later · before 5.15.100affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.20-16.1.20-1

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-2023-53586Oct 4, 2025 · scsi: target: Fix multiple LUN_RESET handling
    18Monitor
  • ← EarlierCVE-2023-53588Oct 4, 2025 · wifi: mac80211: check for station first in client probe
    22Monitor
  • Later →CVE-2023-53591Oct 4, 2025 · net/mlx5e: Fix deadlock in tc route query code
    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 Linux03c3a5584a0a29821e59b7834635ce823050caaaVendor (CNA)
Linux Linux5.10.173Vendor (CNA)
Linux Linux5.15.100Vendor (CNA)
Linux Linux5.4.235Vendor (CNA)
Linux Linux6.1Vendor (CNA)
Linux Linux68ba44639537de6f91fe32783766322d41848127Vendor (CNA)
Linux Linux6d529928ea212127851a2df8c40d822237ca946bVendor (CNA)
Linux Linux8ee401f89cdb10f39098c0656d695b2bc4052100Vendor (CNA)
Linux Linuxbf5540cbd20e2dae2c81ab9b31deef41ef147d0aVendor (CNA)
Linux Linuxcec326443f01283ef68ea00c06ea073b1835a562Vendor (CNA)
debian:linux6.1.20-1 · 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.

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
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-667 · Improper Locking

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.

Change log

  1. Fix✗ → ✓

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

References

Show all references (5 more)

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

All records