5.5

CVE-2026-43333: linux NULL Pointer Dereference

CVSS: 5.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-43333DEBIAN-CVE-2026-43333
Published 08-05-2026Last modified 23-05-2026
Open JSON

Vulnerability summary

CVE-2026-43333 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 5.1% 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
0.16%
0%100%
Low · +0.04 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 37 · Related 37
SUSE-SU-2026:22043-1SUSE-SU-2026:22048-1SUSE-SU-2026:22076-1SUSE-SU-2026:22087-1SUSE-SU-2026:22108-1SUSE-SU-2026:22137-1

Timeline

  1. 08-05-2026
    PublishedVulnerability first disclosed.
  2. 23-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: reject direct access to nullable PTR_TO_BUF pointers check_mem_access() matches PTR_TO_BUF via base_type() which strips PTR_MAYBE_NULL, allowing direct dereference without a null check. Map iterator ctx->key and ctx->value are PTR_TO_BUF | PTR_MAYBE_NULL. On stop callbacks these are NULL, causing a kernel NULL dereference. Add a type_may_be_null() guard to the PTR_TO_BUF branch, matching the existing PTR_TO_BTF_ID pattern.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

5%

Versus all other CVEs

30-day change

+0.04 pp

From 0.12% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.16%

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< 5.15.0-186.196 | < 6.8.0-136.136 | All versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1112.119 | < 6.8.0-1061.64 | All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ b453361384c2db1c703dacb806d5fd36aec4ceca, < 10bc4a4dcded509c5d5c67d497900c3922c604cd | ≥ 20b2aff4bc15bda809f994761d5719827d66c0b4, < 21a10c06ffae24cb01fd174a7ab7736001d2ea56 | ≥ 20b2aff4bc15bda809f994761d5719827d66c0b4, < 8755066f7bd0f4ac46a29d1708c7b20894539252 | ≥ 20b2aff4bc15bda809f994761d5719827d66c0b4, < 70abd9d118da2f56beb4ec22e3a29becae373535 | ≥ 20b2aff4bc15bda809f994761d5719827d66c0b4, < 63276547debc4d8a73eefb2c5273b2a905c961b0 | ≥ 20b2aff4bc15bda809f994761d5719827d66c0b4, < 4f6c99dc0420f1a3d671c1b8ab8a7ac84d9cba09 | ≥ 20b2aff4bc15bda809f994761d5719827d66c0b4, < b0db1accbc7395657c2b79db59fa9fae0d6656f3 | e982070f8970bb62e69ed7c9cafff886ed200349 | ≥ 5.15.37, < 5.15.203 | ≥ 5.16.11, < 5.17 | 5.17
  • linux_kernel≥ 5.15.37, < 5.15.203 | ≥ 5.16.11, < 6.1.168 | ≥ 6.2, < 6.6.134 | ≥ 6.7, < 6.12.81 | ≥ 6.13, < 6.18.22 | ≥ 6.19, < 6.19.12 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.12-1

3 vendors · 148 products

References

38 links
Show all 38 references