5.5

CVE-2026-43272: linux NULL Pointer Dereference

CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2026-43272DEBIAN-CVE-2026-43272CGA-2c33-87mq-g7xq
Published 06-05-2026Last modified 21-10-2026
Open JSON

Vulnerability summary

CVE-2026-43272 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 4.8% 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 · +0.05 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 5 · Related 6
OPENSUSE-SU-2026:22091-1SUSE-SU-2026:24179-1SUSE-SU-2026:24184-1SUSE-SU-2026:24197-1SUSE-SU-2026:24235-1CGA-GRVF-J23R-9F88

Timeline

  1. 06-05-2026
    PublishedVulnerability first disclosed.
  2. 21-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Fix possible dereference of uninitialized pointer There is a pointer head_page in rb_meta_validate_events() which is not initialized at the beginning of a function. This pointer can be dereferenced if there is a failure during reader page validation. In this case the control is passed to "invalid" label where the pointer is dereferenced in a loop. To fix the issue initialize orig_head and head_page before calling rb_validate_buffer. Found by Linux Verification Center (linuxtesting.org) with SVACE.

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

+0.05 pp

From 0.11% 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

Ubuntu107 products
  • linuxAll versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Chainguard5 products
  • linux-aws-6.12< 6.12.85-r2
  • linux-azure-6.12< 6.12.85-r2
  • linux-gcp-6.12< 6.12.85-r2
  • linux-qemu-6.12< 6.12.85-r2
  • linux-vmware-6.12< 6.12.85-r2
Linux2 products
  • linux≥ 5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55, < a4afdff9c715af50cf6c3f2dc601932c2cea17a2 | ≥ 5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55, < bc77986f3cb7476637052edf2d87137fa39f153d | ≥ 5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55, < d9942396845fef2369478c157b26738fe07142f6 | ≥ 5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55, < f1547779402c4cd67755c33616b7203baa88420b | 6.12
  • linux_kernel≥ 6.12, < 6.18.16 | ≥ 6.19, < 6.19.6
Debian1 product
  • linuxAll versions (No fix recorded) | < 6.19.6-1

4 vendors · 115 products

References

8 links