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NVD / CVE Program· CNA Linux

CVE-2021-46909: ARM: footbridge: fix PCI interrupt mapping

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: 0.24% (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 1fc087fdb98d556b416c82ed6e3964a30885f47a, 2643da6aa57920d9159a1a579fb04f89a2b0d29a, 30e3b4f256b4e366a61658c294f6a21b8626dda7.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 1fc087fdb98d556b416c82ed6e3964a30885f47a, 2643da6aa57920d9159a1a579fb04f89a2b0d29a, 30e3b4f256b4e366a61658c294f6a21b8626dda7 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: ARM: footbridge: fix PCI interrupt mapping Since commit 30fdfb929e82 ("PCI: Add a call to pci_assign_irq() in pci_device_probe()"), the PCI code will call the IRQ mapping function whenever a PCI driver is probed. If these are marked as __init, this causes an oops if a PCI driver is loaded or bound after the kernel has initialised.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Feb 27, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 15th 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.

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-2021-46909

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 kernel4.13.0 and later · before 4.14.232
  • linux linux kernel4.15.0 and later · before 4.19.189
  • linux linux kernel4.20.0 and later · before 5.4.114
  • linux linux kernel5.5.0 and later · before 5.10.32
  • linux linux kernel5.11.0 and later · before 5.11.16

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

    • 4.13affected
    • 30fdfb929e82450bbf3d0e0aba56efbc29b52b52 and later · before 532747fd5c7aaa17ee5cf79f3e947c31eb0e35cfaffected · git
    • 30fdfb929e82450bbf3d0e0aba56efbc29b52b52 and later · before 2643da6aa57920d9159a1a579fb04f89a2b0d29aaffected · git
    • 30fdfb929e82450bbf3d0e0aba56efbc29b52b52 and later · before 871b569a3e67f570df9f5ba195444dc7c621293baffected · git
    • 30fdfb929e82450bbf3d0e0aba56efbc29b52b52 and later · before 1fc087fdb98d556b416c82ed6e3964a30885f47aaffected · git
    • 30fdfb929e82450bbf3d0e0aba56efbc29b52b52 and later · before c3efce8cc9807339633ee30e39882f4c8626ee1daffected · git
    • 30fdfb929e82450bbf3d0e0aba56efbc29b52b52 and later · before 30e3b4f256b4e366a61658c294f6a21b8626dda7affected · git
    • before 4.13not affected · semver
    • 4.14.232 and later · up to and including 4.14.*not affected · semver
    • 4.19.189 and later · up to and including 4.19.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8kernel-rtbefore 4.18.0-553.8.1.rt7.349.el8_104.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8kernel-rt-corebefore 4.18.0-553.8.1.rt7.349.el8_104.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8kernel-rt-debugbefore 4.18.0-553.8.1.rt7.349.el8_104.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8kernel-rt-debug-corebefore 4.18.0-553.8.1.rt7.349.el8_104.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8kernel-rt-debug-develbefore 4.18.0-553.8.1.rt7.349.el8_104.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8kernel-rt-debug-kvmbefore 4.18.0-553.8.1.rt7.349.el8_104.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8kernel-rt-debug-modulesbefore 4.18.0-553.8.1.rt7.349.el8_104.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8kernel-rt-debug-modules-extrabefore 4.18.0-553.8.1.rt7.349.el8_104.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8kernel-rt-develbefore 4.18.0-553.8.1.rt7.349.el8_104.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8kernel-rt-kvmbefore 4.18.0-553.8.1.rt7.349.el8_104.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8kernel-rt-modulesbefore 4.18.0-553.8.1.rt7.349.el8_104.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8kernel-rt-modules-extrabefore 4.18.0-553.8.1.rt7.349.el8_104.18.0-553.8.1.rt7.349.el8_10
Debian:12linuxbefore 5.10.38-15.10.38-1
Red Hat:enterprise_linux:8::baseosbpftoolbefore 0:4.18.0-553.8.1.el8_100:4.18.0-553.8.1.el8_10
Red Hat:enterprise_linux:8::baseosbpftool-debuginfobefore 0:4.18.0-553.8.1.el8_100:4.18.0-553.8.1.el8_10
Red Hat:enterprise_linux:8::baseoskernelbefore 0:4.18.0-553.8.1.el8_100:4.18.0-553.8.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-abi-stablelistsbefore 0:4.18.0-553.8.1.el8_100:4.18.0-553.8.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-corebefore 0:4.18.0-553.8.1.el8_100:4.18.0-553.8.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debugbefore 0:4.18.0-553.8.1.el8_100:4.18.0-553.8.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debug-corebefore 0:4.18.0-553.8.1.el8_100:4.18.0-553.8.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debug-debuginfobefore 0:4.18.0-553.8.1.el8_100:4.18.0-553.8.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debug-develbefore 0:4.18.0-553.8.1.el8_100:4.18.0-553.8.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debug-modulesbefore 0:4.18.0-553.8.1.el8_100:4.18.0-553.8.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debug-modules-extrabefore 0:4.18.0-553.8.1.el8_100:4.18.0-553.8.1.el8_10

+73

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-2023-52474Feb 26, 2024 · IB/hfi1: Fix bugs with non-PAGE_SIZE-end multi-iovec user SDMA requests
    31Monitor
  • ← EarlierCVE-2021-46908Feb 27, 2024 · bpf: Use correct permission flag for mixed signed bounds arithmetic
    22Monitor
  • Later →CVE-2021-46910Feb 27, 2024 · ARM: 9063/1: mm: reduce maximum number of CPUs if DEBUG_KMAP_LOCAL is enabled
    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 Linux1fc087fdb98d556b416c82ed6e3964a30885f47aVendor (CNA)
Linux Linux2643da6aa57920d9159a1a579fb04f89a2b0d29aVendor (CNA)
Linux Linux30e3b4f256b4e366a61658c294f6a21b8626dda7Vendor (CNA)
Linux Linux532747fd5c7aaa17ee5cf79f3e947c31eb0e35cfVendor (CNA)
Linux Linux871b569a3e67f570df9f5ba195444dc7c621293bVendor (CNA)
Linux Linuxc3efce8cc9807339633ee30e39882f4c8626ee1dVendor (CNA)
almalinux:kernel-rt4.18.0-553.8.1.rt7.349.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-core4.18.0-553.8.1.rt7.349.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug4.18.0-553.8.1.rt7.349.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-core4.18.0-553.8.1.rt7.349.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-devel4.18.0-553.8.1.rt7.349.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-kvm4.18.0-553.8.1.rt7.349.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules4.18.0-553.8.1.rt7.349.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules-extra4.18.0-553.8.1.rt7.349.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-devel4.18.0-553.8.1.rt7.349.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-kvm4.18.0-553.8.1.rt7.349.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules4.18.0-553.8.1.rt7.349.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules-extra4.18.0-553.8.1.rt7.349.el8_10 · AlmaLinux:8Package registry (OSV)
debian:linux5.10.38-1 · Debian:12Package registry (OSV)
red hat:bpftool0:4.18.0-553.8.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:bpftool-debuginfo0:4.18.0-553.8.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel0:4.18.0-553.8.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-abi-stablelists0:4.18.0-553.8.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-core0:4.18.0-553.8.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug0:4.18.0-553.8.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-core0:4.18.0-553.8.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-debuginfo0:4.18.0-553.8.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-devel0:4.18.0-553.8.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-modules0:4.18.0-553.8.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-modules-extra0:4.18.0-553.8.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)

+15

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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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.

  • CVE-2021-470141 days apartnet/sched: act_ct: fix wild memory access when clearing fragments
    31Monitor
  • CVE-2024-42159154 days apartscsi: mpi3mr: Sanitise num_phys
    31Monitor
  • CVE-2024-42160154 days apartf2fs: check validation of fault attrs in f2fs_build_fault_attr()
    31Monitor
  • CVE-2024-42284172 days aparttipc: Return non-zero value from tipc_udp_addr2str() on error
    31Monitor
  • CVE-2024-47727237 days apartx86/tdx: Fix "in-kernel MMIO" check
    31Monitor
  • CVE-2025-38566539 days apartsunrpc: fix handling of server side tls alerts
    30Monitor

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

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-754 · Improper Check for Unusual or Exceptional Conditions

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 (5 more)

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

All records