Skip to content
Noroxi
NVD / CVE Program· CNA Linux

CVE-2024-26812: vfio/pci: Create persistent INTx handler

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: 0.25% (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 0e09cf81959d9f12b75ad5c6dd53d237432ed034, 18c198c96a815c962adc2b9b77909eec0be7df4d, 27d40bf72dd9a6600b76ad05859176ea9a1b4897; cbl2 kernel 5.15.176.3-3 on CBL Mariner 2.0 5.15.176.3-3; cbl2 kernel 5.15.182.1-1 on CBL Mariner 2.0 CBL-Mariner Releases.
  • Severity is disputed: the assigning authority (CNA) scores it 7.8, NVD 5.5.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0e09cf81959d9f12b75ad5c6dd53d237432ed034, 18c198c96a815c962adc2b9b77909eec0be7df4d, 27d40bf72dd9a6600b76ad05859176ea9a1b4897; cbl2 kernel 5.15.176.3-3 on CBL Mariner 2.0 5.15.176.3-3; cbl2 kernel 5.15.182.1-1 on CBL Mariner 2.0 CBL-Mariner Releases 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: vfio/pci: Create persistent INTx handler A vulnerability exists where the eventfd for INTx signaling can be deconfigured, which unregisters the IRQ handler but still allows eventfds to be signaled with a NULL context through the SET_IRQS ioctl or through unmask irqfd if the device interrupt is pending. Ideally this could be solved with some additional locking; the igate mutex serializes the ioctl and config space accesses, and the interrupt handler is unregistered relative to the trigger, but the irqfd path runs asynchronous to those. The igate mutex cannot be acquired from the atomic context of the eventfd wake function. Disabling the irqfd relative to the eventfd registration is potentially incompatible with existing userspace. As a result, the solution implemented here moves configuration of the INTx interrupt handler to track the lifetime of the INTx context object and irq_type configuration, rather than registration of a particular trigger eventfd. Synchronization is added between the ioctl path and eventfd_signal() wrapper such that the eventfd trigger can be dynamically updated relative to in-flight interrupts or irqfd callbacks.

Published
Apr 5, 2024
Updated
Oct 15, 2026
EPSS
0.2% · 16th 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 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.5
CNA · Linux
7.8
2.3 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2024-26812

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

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits every 10 minutes on paid plans, on the hour on the free plan.

Your free account also gets you

  • CVE alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools, at most 30 a day (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for linux records
Is your version affected? Check it

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.

We use this product, ask for help

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
debiandebian linux

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

    • 3.6affected
    • 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 and later · before b18fa894d615c8527e15d96b76c7448800e13899affected · git
    • 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 and later · before 27d40bf72dd9a6600b76ad05859176ea9a1b4897affected · git
    • 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 and later · before 4cb0d7532126d23145329826c38054b4e9a05e7caffected · git
    • 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 and later · before 7d29d4c72c1e196cce6969c98072a272d1a703b3affected · git
    • 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 and later · before 69276a555c740acfbff13fb5769ee9c92e1c828eaffected · git
    • 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 and later · before 4c089cefe30924fbe20dd1ee92774ea1f5eca834affected · git
    • 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 and later · before 0e09cf81959d9f12b75ad5c6dd53d237432ed034affected · git
    • 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 and later · before 18c198c96a815c962adc2b9b77909eec0be7df4daffected · git
    • before 3.6not affected · semver
Affected versions · NVD (5)

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

  • debian debian linux10.0
  • linux linux kernel3.6 and later · before 6.1.84
  • linux linux kernel6.2 and later · before 6.6.24
  • linux linux kernel6.7 and later · before 6.7.12
  • linux linux kernel6.8 and later · before 6.8.3

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.85-16.1.85-1
Debian:13linuxbefore 6.7.12-16.7.12-1

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-2024-26814Apr 5, 2024 · vfio/fsl-mc: Block calling interrupt handler without trigger
    22Monitor
  • ← EarlierCVE-2024-26810Apr 5, 2024 · vfio/pci: Lock external INTx masking ops
    31Monitor
  • Later →CVE-2024-27437Apr 5, 2024 · vfio/pci: Disable auto-enable of exclusive INTx IRQ
    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 Linux0e09cf81959d9f12b75ad5c6dd53d237432ed034Vendor (CNA)
Linux Linux18c198c96a815c962adc2b9b77909eec0be7df4dVendor (CNA)
Linux Linux27d40bf72dd9a6600b76ad05859176ea9a1b4897Vendor (CNA)
Linux Linux4c089cefe30924fbe20dd1ee92774ea1f5eca834Vendor (CNA)
Linux Linux4cb0d7532126d23145329826c38054b4e9a05e7cVendor (CNA)
Linux Linux69276a555c740acfbff13fb5769ee9c92e1c828eVendor (CNA)
Linux Linux7d29d4c72c1e196cce6969c98072a272d1a703b3Vendor (CNA)
Linux Linuxb18fa894d615c8527e15d96b76c7448800e13899Vendor (CNA)
cbl2 kernel 5.15.176.3-3 on CBL Mariner 2.05.15.176.3-3 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.182.1-1 on CBL Mariner 2.0CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.182.1-1 on CBL-Mariner 2.05.15.176.3-3 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.85-1 · Debian:12Package 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 (9 more)

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

All records