5.5

CVE-2026-23206: linux NULL Pointer Dereference

CVSS: 5.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-23206DEBIAN-CVE-2026-23206
Published 14-02-2026Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2026-23206 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.5% 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
0.13%
0%100%
Low · +0.01 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
DLA-4499-1DSA-6141-1DSA-6163-1MGASA-2026-0097MGASA-2026-0098USN-8278-1

Timeline

  1. 14-02-2026
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: dpaa2-switch: prevent ZERO_SIZE_PTR dereference when num_ifs is zero The driver allocates arrays for ports, FDBs, and filter blocks using kcalloc() with ethsw->sw_attr.num_ifs as the element count. When the device reports zero interfaces (either due to hardware configuration or firmware issues), kcalloc(0, ...) returns ZERO_SIZE_PTR (0x10) instead of NULL. Later in dpaa2_switch_probe(), the NAPI initialization unconditionally accesses ethsw->ports[0]->netdev, which attempts to dereference ZERO_SIZE_PTR (address 0x10), resulting in a kernel panic. Add a check to ensure num_ifs is greater than zero after retrieving device attributes. This prevents the zero-sized allocations and subsequent invalid pointer dereference.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

+0.01 pp

From 0.12% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.13%

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

Ubuntu145 products
  • linux< 5.15.0-185.195 | < 6.8.0-117.117 | All versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1111.118 | < 6.8.0-1055.58 | All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 0b1b71370458860579831e77485883fcf2e8fbbe, < 2fcccca88456b592bd668db13aa1d29ed257ca2b | ≥ 0b1b71370458860579831e77485883fcf2e8fbbe, < 80165ff16051448d6f840585ebe13f2400415df3 | ≥ 0b1b71370458860579831e77485883fcf2e8fbbe, < b97415c4362f739e25ec6f71012277086fabdf6f | ≥ 0b1b71370458860579831e77485883fcf2e8fbbe, < 4acc40db06ffd0fd92683505342b00c8a7394c60 | ≥ 0b1b71370458860579831e77485883fcf2e8fbbe, < 155eb99aff2920153bf21217ae29565fff81e6af | ≥ 0b1b71370458860579831e77485883fcf2e8fbbe, < ed48a84a72fefb20a82dd90a7caa7807e90c6f66 | 5.13
  • linux_kernel≥ 5.13, < 5.15.200 | ≥ 5.16, < 6.1.163 | ≥ 6.2, < 6.6.124 | ≥ 6.7, < 6.12.70 | ≥ 6.13, < 6.18.10 | 6.19:rc1 | 6.19:rc2 | 6.19:rc3 | 6.19:rc4 | 6.19:rc5 | 6.19:rc6 | 6.19:rc7 | 6.19:rc8
Debian1 product
  • linux< 6.1.164-1 | < 6.12.73-1 | < 6.18.10-1

3 vendors · 148 products

References

26 links
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