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NVD / CVE Program· CNA Linux

CVE-2026-23443: ACPI: processor: Fix previous acpi_processor_errata_piix4() fix

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: 0.12% (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 2e369ba9eb7b8a06e9cc35a3e7fe73e59272f8c2, 5.15.203, 6.1.167.

Low priority for now. Upgrade to Linux Linux 2e369ba9eb7b8a06e9cc35a3e7fe73e59272f8c2, 5.15.203, 6.1.167 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: ACPI: processor: Fix previous acpi_processor_errata_piix4() fix After commi f132e089fe89 ("ACPI: processor: Fix NULL-pointer dereference in acpi_processor_errata_piix4()"), device pointers may be dereferenced after dropping references to the device objects pointed to by them, which may cause a use-after-free to occur. Moreover, debug messages about enabling the errata may be printed if the errata flags corresponding to them are unset. Address all of these issues by moving message printing to the points in the code where the errata flags are set.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Apr 3, 2026
Updated
Jul 24, 2026
EPSS
0.1% · 2th 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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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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

Affected versions

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

  • linux linux kernel6.1.165 and later · before 6.1.167
  • linux linux kernel6.6.128 and later · before 6.6.130
  • linux linux kernel6.12.75 and later · before 6.12.78
  • linux linux kernel6.18.16 and later · before 6.18.20
  • linux linux kernel6.19.6 and later · before 6.19.10
  • linux linux kernel5.15.202

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

    • 06724a60cfa9767ea90b0f5d3dfb5cdd251b64f5 and later · before 68408e8f9e366ad9850a66ac65cb569f13bf6cd4affected · git
    • ad86ac604f8391c0212a91412d4f764c7a85f254 and later · before 2e369ba9eb7b8a06e9cc35a3e7fe73e59272f8c2affected · git
    • 01e8751b37a366b1ca561add0042f2ceb18c03bf and later · before edf4c2aaee08e8fd503fbae705c801e92a0b55d7affected · git
    • b803811485ac0b2f774b6bf3abc8b999ba3b7033 and later · before e0c470049344e9346fff79d7e2362212c216665eaffected · git
    • 29f60d3d06818d40118a30d663231f027ae87a05 and later · before 98473309a36acc271009b85e0bb53a4c0dddf5c2affected · git
    • 0398b641be2b66c2fc7e0163c606ef19372e7ad5 and later · before 8583f62259e1b315d5239371adfb36939cdab741affected · git
    • f132e089fe89cadc2098991f0a3cb05c3f824ac6 and later · before bf504b229cb8d534eccbaeaa23eba34c05131e25affected · git
    • 5.15.202 and later · before 5.15.203affected · semver
    • 6.1.165 and later · before 6.1.167affected · semver
    • 6.6.128 and later · before 6.6.130affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:14linuxbefore 6.19.10-16.19.10-1
SUSE:Linux Enterprise Live Patching 12 SP5kernel-defaultbefore 4.12.14-122.328.14.12.14-122.328.1
SUSE:Linux Enterprise Live Patching 12 SP5kgraft-patch-SLE12-SP5_Update_87before 1-8.5.11-8.5.1
SUSE:Linux Enterprise Server 12 SP5-LTSSkernel-sourcebefore 4.12.14-122.328.14.12.14-122.328.1
SUSE:Linux Enterprise Server 12 SP5-LTSSkernel-symsbefore 4.12.14-122.328.14.12.14-122.328.1

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-2026-23433Apr 3, 2026 · arm_mpam: Fix null pointer dereference when restoring bandwidth counters
    22Monitor
  • ← EarlierCVE-2026-23435Apr 3, 2026 · perf/x86: Move event pointer setup earlier in x86_pmu_enable()
    22Monitor
  • Later →CVE-2026-23453Apr 3, 2026 · net: ti: icssg-prueth: Fix memory leak in XDP_DROP for non-zero-copy mode
    30Monitor

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 Linux2e369ba9eb7b8a06e9cc35a3e7fe73e59272f8c2Vendor (CNA)
Linux Linux5.15.203Vendor (CNA)
Linux Linux6.1.167Vendor (CNA)
Linux Linux6.12.78Vendor (CNA)
Linux Linux6.18.20Vendor (CNA)
Linux Linux6.19.10Vendor (CNA)
Linux Linux6.6.130Vendor (CNA)
Linux Linux68408e8f9e366ad9850a66ac65cb569f13bf6cd4Vendor (CNA)
Linux Linux8583f62259e1b315d5239371adfb36939cdab741Vendor (CNA)
Linux Linux98473309a36acc271009b85e0bb53a4c0dddf5c2Vendor (CNA)
Linux Linuxbf504b229cb8d534eccbaeaa23eba34c05131e25Vendor (CNA)
Linux Linuxe0c470049344e9346fff79d7e2362212c216665eVendor (CNA)
Linux Linuxedf4c2aaee08e8fd503fbae705c801e92a0b55d7Vendor (CNA)
debian:linux6.19.10-1 · Debian:14Package registry (OSV)
suse:kernel-default4.12.14-122.328.1 · SUSE:Linux Enterprise Live Patching 12 SP5Package registry (OSV)
suse:kernel-source4.12.14-122.328.1 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:kernel-syms4.12.14-122.328.1 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:kgraft-patch-SLE12-SP5_Update_871-8.5.1 · SUSE:Linux Enterprise Live Patching 12 SP5Package 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.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

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.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (6 more)

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

All records