CVE-2023-53590

Medium

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.

Package Linux Kernel
Published 2025-10-04
Last modified 2026-03-21
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

5.5

out of 10
Medium
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
High
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness type

CWE-667

CVE-2023-53590 is a Improper Locking vulnerability

What is Improper Locking?

The product does not properly acquire or release a lock, which can lead to unexpected behaviour. Learn more on MITRE CWE

Affected versions

Linux kernel versions 5.4.226, 5.10.158, 5.15.82, 6.0.12, 6.1 and later are affected. Fixed in 5.4.235, 5.10.173, 5.15.100, 6.1.18, 6.2.5, 6.3 and their respective stable series.

Affected from
≥ 5.4.226 ≥ 5.10.158 ≥ 5.15.82 ≥ 6.0.12 ≥ 6.1
Fixed in
✓ 5.4.235 5.4.x ✓ 5.10.173 5.10.x ✓ 5.15.100 5.15.x ✓ 6.1.18 6.1.x ✓ 6.2.5 6.2.x ✓ 6.3

References

The following references provide additional information about CVE-2023-53590 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

6 patch commits total View all on NVD

Frequently asked questions

  • What is CVE-2023-53590?

    CVE-2023-53590 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as an Improper Locking flaw (CWE-667) . It affects Linux kernel versions from 5.4.226 onward and has been patched in 5.4.235, 5.10.173, 5.15.100 and others. CVE-2023-53590 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2023-53590?

    CVE-2023-53590 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H .

  • Is there a patch available for CVE-2023-53590?

    Yes — CVE-2023-53590 has been patched. Fixed versions include 5.4.235, 5.10.173, 5.15.100 and others. If you are running Linux kernel 5.4.226 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2023-53590 actively exploited?

    No — CVE-2023-53590 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

  • What is Improper Locking (CWE-667)?

    The product does not properly acquire or release a lock, which can lead to unexpected behaviour. View CWE-667 on MITRE CWE →

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