5.5

CVE-2023-53603: linux NULL Pointer Dereference

CVSS: 5.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2023-53603DEBIAN-CVE-2023-53603
Published 04-10-2025Last modified 23-05-2026
Open JSON

Vulnerability summary

CVE-2023-53603 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 3.4% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.14%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 15 · Related 15
SUSE-SU-2025:21040-1SUSE-SU-2025:21052-1SUSE-SU-2025:21056-1SUSE-SU-2025:21064-1SUSE-SU-2025:4057-1SUSE-SU-2025:4111-1

Timeline

  1. 04-10-2025
    PublishedVulnerability first disclosed.
  2. 23-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: scsi: qla2xxx: Avoid fcport pointer dereference Klocwork reported warning of NULL pointer may be dereferenced. The routine exits when sa_ctl is NULL and fcport is allocated after the exit call thus causing NULL fcport pointer to dereference at the time of exit. To avoid fcport pointer dereference, exit the routine when sa_ctl is NULL.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

0.00 pp

From 0.15% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.14%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu124 products
  • linuxAll versions (No fix recorded) | < 5.15.0-86.96
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1047.52
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 7b2fbfa4b2cd3a24c1760b85d842e928070d4744, < 4406fe8a96a946c7ea5724ee59625755a1d9c59d | ≥ e0fb8ce2bb9e52c846e54ad2c58b5b7beb13eb09, < 477bc74ad1add644b606bff6ba1284943c42818a | ≥ e0fb8ce2bb9e52c846e54ad2c58b5b7beb13eb09, < 7bbeff613ec0560fb2f6f8b405288f3f043adf64 | ≥ e0fb8ce2bb9e52c846e54ad2c58b5b7beb13eb09, < 6b504d06976fe4a61cc05dedc68b84fadb397f77 | 47b583ad1f7e459689eb1bdd222279a6986ccd69 | d2deafaef0330a863b5e046c1154b605588d19f7 | ≥ 5.15.61, < 5.15.121 | ≥ 5.18.18, < 5.19 | ≥ 5.19.2, < 5.20 | 6.0
  • linux_kernel≥ 5.15.61, < 5.15.121 | ≥ 5.18.18, < 5.19 | ≥ 5.19.2, < 6.1.40 | ≥ 6.2, < 6.4.5
Debian1 product
  • linux< 6.1.52-1 | < 6.4.11-1

3 vendors · 127 products

References

8 links