VulnerabilityPublished 6 May 2026Updated 21 Oct 2026

CVE-2026-43272: Linux kernel · ring-buffer: Fix possible dereference of uninitialized pointer

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in f1547779402c4cd67755c33616b7203baa88420b : update Linux kernel when convenient.

Data as of 26 Oct 2026, 12:55 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f1547779402c4cd67755c33616b7203baa88420b, d9942396845fef2369478c157b26738fe07142f6, bc77986f3cb7476637052edf2d87137fa39f153d +1

Exploitation evidence

Disclosed: evidence found.
CVE published 6 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Linux kernel to f1547779402c4cd67755c33616b7203baa88420b, d9942396845fef2369478c157b26738fe07142f6, bc77986f3cb7476637052edf2d87137fa39f153d or a4afdff9c715af50cf6c3f2dc601932c2cea17a2.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55, < f1547779402c4cd67755c33616b7203baa88420b	Fixed in f1547779402c4cd67755c33616b7203baa88420b
LinuxLinux	Affected ≥ 5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55, < d9942396845fef2369478c157b26738fe07142f6	Fixed in d9942396845fef2369478c157b26738fe07142f6
LinuxLinux	Affected ≥ 5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55, < bc77986f3cb7476637052edf2d87137fa39f153d	Fixed in bc77986f3cb7476637052edf2d87137fa39f153d
LinuxLinux	Affected ≥ 5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55, < a4afdff9c715af50cf6c3f2dc601932c2cea17a2	Fixed in a4afdff9c715af50cf6c3f2dc601932c2cea17a2
LinuxLinux	Affected =6.12	Fixed in–

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.

References

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