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NVD / CVE Program· CNA Linux

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

MediumCVSS 5.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.15% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux a4afdff9c715af50cf6c3f2dc601932c2cea17a2, bc77986f3cb7476637052edf2d87137fa39f153d, d9942396845fef2369478c157b26738fe07142f6.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux a4afdff9c715af50cf6c3f2dc601932c2cea17a2, bc77986f3cb7476637052edf2d87137fa39f153d, d9942396845fef2369478c157b26738fe07142f6 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

Published
May 6, 2026
Updated
Nov 11, 2026
EPSS
0.1% · 5th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Follow CVE-2026-43272

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 6.12affected
    • 5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55 and later · before a4afdff9c715af50cf6c3f2dc601932c2cea17a2affected · git
    • 5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55 and later · before bc77986f3cb7476637052edf2d87137fa39f153daffected · git
    • 5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55 and later · before d9942396845fef2369478c157b26738fe07142f6affected · git
    • 5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55 and later · before f1547779402c4cd67755c33616b7203baa88420baffected · git
    • before 6.12not affected · semver
    • 6.12.114 and later · up to and including 6.12.*not affected · semver
    • 6.18.16 and later · up to and including 6.18.*not affected · semver
    • 6.19.6 and later · up to and including 6.19.*not affected · semver
    • 7.0 and laternot affected · original_commit_for_fix

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel6.12 and later · before 6.18.16
  • linux linux kernel6.19 and later · before 6.19.6

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:13linuxbefore 6.12.115-26.12.115-2
Debian:14linuxbefore 6.19.6-16.19.6-1
openSUSE:Leap 16.0dtb-aarch64before 6.12.0-160000.39.16.12.0-160000.39.1
openSUSE:Leap 16.0kernel-64kbbefore 6.12.0-160000.39.16.12.0-160000.39.1
openSUSE:Leap 16.0kernel-azurebefore 6.12.0-160000.39.16.12.0-160000.39.1
openSUSE:Leap 16.0kernel-defaultbefore 6.12.0-160000.39.16.12.0-160000.39.1
openSUSE:Leap 16.0kernel-default-basebefore 6.12.0-160000.39.1.160000.2.256.12.0-160000.39.1.160000.2.25
openSUSE:Leap 16.0kernel-docsbefore 6.12.0-160000.39.16.12.0-160000.39.1
openSUSE:Leap 16.0kernel-kvmsmallbefore 6.12.0-160000.39.16.12.0-160000.39.1
openSUSE:Leap 16.0kernel-obs-buildbefore 6.12.0-160000.39.16.12.0-160000.39.1
openSUSE:Leap 16.0kernel-obs-qabefore 6.12.0-160000.39.16.12.0-160000.39.1
openSUSE:Leap 16.0kernel-rtbefore 6.12.0-160000.39.16.12.0-160000.39.1
openSUSE:Leap 16.0kernel-sourcebefore 6.12.0-160000.39.16.12.0-160000.39.1
openSUSE:Leap 16.0kernel-symsbefore 6.12.0-160000.39.16.12.0-160000.39.1
openSUSE:Leap 16.0kernel-zfcpdumpbefore 6.12.0-160000.39.16.12.0-160000.39.1
SUSE:Linux Enterprise Server 16.0kernel-azurebefore 6.12.0-160000.39.16.12.0-160000.39.1
SUSE:Linux Enterprise Server 16.0kernel-docsbefore 6.12.0-160000.39.16.12.0-160000.39.1
SUSE:Linux Enterprise Server 16.0kernel-kvmsmallbefore 6.12.0-160000.39.16.12.0-160000.39.1
SUSE:Linux Enterprise Server 16.0kernel-obs-qabefore 6.12.0-160000.39.16.12.0-160000.39.1
SUSE:Linux Enterprise Server 16.0kernel-zfcpdumpbefore 6.12.0-160000.39.16.12.0-160000.39.1
SUSE:Linux Micro 6.2kernel-64kbbefore 6.12.0-160000.39.16.12.0-160000.39.1
SUSE:Linux Micro 6.2kernel-defaultbefore 6.12.0-160000.39.16.12.0-160000.39.1
SUSE:Linux Micro 6.2kernel-default-basebefore 6.12.0-160000.39.1.160000.2.266.12.0-160000.39.1.160000.2.26
SUSE:Linux Micro 6.2kernel-rtbefore 6.12.0-160000.39.16.12.0-160000.39.1

+3

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-43270May 6, 2026 · media: mtk-mdp: Fix a reference leak bug in mtk_mdp_remove()
    22Monitor
  • ← EarlierCVE-2026-43271May 6, 2026 · md-cluster: fix NULL pointer dereference in process_metadata_update
    22Monitor
  • Later →CVE-2026-43273May 6, 2026 · ceph: supply snapshot context in ceph_zero_partial_object()
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linuxa4afdff9c715af50cf6c3f2dc601932c2cea17a2Vendor (CNA)
Linux Linuxbc77986f3cb7476637052edf2d87137fa39f153dVendor (CNA)
Linux Linuxd9942396845fef2369478c157b26738fe07142f6Vendor (CNA)
Linux Linuxf1547779402c4cd67755c33616b7203baa88420bVendor (CNA)
debian:linux6.12.115-2 · Debian:13Package registry (OSV)
debian:linux6.19.6-1 · Debian:14Package registry (OSV)
opensuse:dtb-aarch646.12.0-160000.39.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-64kb6.12.0-160000.39.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-azure6.12.0-160000.39.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-default6.12.0-160000.39.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-default-base6.12.0-160000.39.1.160000.2.25 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-docs6.12.0-160000.39.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-kvmsmall6.12.0-160000.39.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-obs-build6.12.0-160000.39.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-obs-qa6.12.0-160000.39.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-rt6.12.0-160000.39.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-source6.12.0-160000.39.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-syms6.12.0-160000.39.1 · openSUSE:Leap 16.0Package registry (OSV)
suse:kernel-64kb6.12.0-160000.39.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-azure6.12.0-160000.39.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-default6.12.0-160000.39.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-default-base6.12.0-160000.39.1.160000.2.26 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-docs6.12.0-160000.39.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-kvmsmall6.12.0-160000.39.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-obs-build6.12.0-160000.39.1 · SUSE:Linux Micro Extras 6.2Package registry (OSV)
suse:kernel-obs-qa6.12.0-160000.39.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-rt6.12.0-160000.39.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-source6.12.0-160000.39.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-syms6.12.0-160000.39.1 · SUSE:Linux Micro Extras 6.2Package registry (OSV)
suse:kernel-zfcpdump6.12.0-160000.39.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records