5.5

CVE-2023-2177: linux linux_kernel NULL Pointer Dereference

Modified
AliasesUBUNTU-CVE-2023-2177DEBIAN-CVE-2023-2177
Published 20-04-2023Last modified 18-03-2025

Vulnerability summary

CVE-2023-2177 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux linux_kernel. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 10.8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.21%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 15 · Related 10
RHSA-2023:2148RHSA-2023:2458RHSA-2023:2736RHSA-2023:2951RHSA-2023:7398SUSE-SU-2023:3988-1

Timeline

  1. 20-04-2023
    PublishedVulnerability first disclosed.
  2. 18-03-2025
    Last modifiedVulnerability information updated.

Description

A null pointer dereference issue was found in the sctp network protocol in net/sctp/stream_sched.c in Linux Kernel. If stream_in allocation is failed, stream_out is freed which would further be accessed. A local user could use this flaw to crash the system or potentially cause a denial of service.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.21%

Chance of exploitation in the next 30 days

Percentile

11%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.21% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu83 products
  • linuxAll versions (No fix recorded) | < 5.4.0-128.144 | < 5.15.0-50.56
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1086.93 | < 5.15.0-1021.25
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
  • linux-aws-5.13All versions (No fix recorded)
Debian1 product
  • linux< 5.18.16-1
Linux1 product
  • linux_kernel< 5.19 | 5.19:rc1 | 5.19:rc2 | 5.19:rc3 | 5.19:rc4 | 5.19:rc5 | 5.19:rc6 | 5.19:rc7 | 5.19:rc8

3 vendors · 85 products

References

7 links