CVE-2026-64462

Local denial of service via stale IRQ handler

Published Jul 25, 2026 · Updated Jul 25, 2026

Use-after-free in the Linux Kernel Altera PCIe driver allows local users to crash or hang the system after a failed controller probe. altera_pcie_probe leaves a chained IRQ handler and INTx domain registered after devm releases struct altera_pcie, so a later interrupt dereferences stale storage. Exploitation requires a probe failure after interrupts are enabled and a subsequent controller interrupt; the bounded impact is system instability or denial of service.

CVSS severity4.7
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux Kernel Altera PCIe driver allows local users to crash or hang the system after a failed controller probe. altera_pcie_probe leaves a chained IRQ handler and INTx domain registered after devm releases struct altera_pcie, so a later interrupt dereferences stale storage. Exploitation requires a probe failure after interrupts are enabled and a subsequent controller interrupt; the bounded impact is system instability or denial of service.

The record

CVE
CVE-2026-64462
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-825, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.9
  2. Affected versionversion=c63aed7334c21de8d626ff028ccad98cf5847a0e <09c43b7b7d29c6fadb27f32cdf7f3bb6598befa9
  3. Affected versionversion=c63aed7334c21de8d626ff028ccad98cf5847a0e <0db9aa9ec51be0a0ffdcdfd9af2b7bf3aeb7911a
  4. Affected versionversion=c63aed7334c21de8d626ff028ccad98cf5847a0e <6864c789b570e57f932847fa83f6b56917182d73
  5. Affected versionversion=c63aed7334c21de8d626ff028ccad98cf5847a0e <7a94138caeb27f3c49c1dbd93bf422098925bb28
  6. Affected versionversion=c63aed7334c21de8d626ff028ccad98cf5847a0e <99fc088d6cc6890ae35fa2f29c50ebe027844c20
  7. Affected versionversion=c63aed7334c21de8d626ff028ccad98cf5847a0e <9cf0cc481e1645ec65e61486ae41c486c59781cb
  8. Affected versionversion=c63aed7334c21de8d626ff028ccad98cf5847a0e <a25bfa2a6665a1d77324d4a609e7513b87680227
  9. Affected versionversion=c63aed7334c21de8d626ff028ccad98cf5847a0e <af7cf5d56d7d57c4fbfdb7b5b693790f331b07b7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.9; version=c63aed7334c21de8d626ff028ccad98cf5847a0e <09c43b7b7d29c6fadb27f32cdf7f3bb6598befa9; version=c63aed7334c21de8d626ff028ccad98cf5847a0e <0db9aa9ec51be0a0ffdcdfd9af2b7bf3aeb7911a; version=c63aed7334c21de8d626ff028ccad98cf5847a0e <6864c789b570e57f932847fa83f6b56917182d73; version=c63aed7334c21de8d626ff028ccad98cf5847a0e <7a94138caeb27f3c49c1dbd93bf422098925bb28; version=c63aed7334c21de8d626ff028ccad98cf5847a0e <99fc088d6cc6890ae35fa2f29c50ebe027844c20; version=c63aed7334c21de8d626ff028ccad98cf5847a0e <9cf0cc481e1645ec65e61486ae41c486c59781cb; version=c63aed7334c21de8d626ff028ccad98cf5847a0e <a25bfa2a6665a1d77324d4a609e7513b87680227; version=c63aed7334c21de8d626ff028ccad98cf5847a0e <af7cf5d56d7d57c4fbfdb7b5b693790f331b07b7

Published CVSS scores

4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-825Expired Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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