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NVD / CVE Program· CNA Linux

CVE-2021-47153: i2c: i801: Don't generate an interrupt on bus reset

Noroxi assessment

Priority: Monitor (action score 28/100)

  • 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: 0.23% (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 04cc05e3716ae31b17ecdab7bc55c8170def1b8b, 09c9e79f4c10cfb6b9e0e1b4dd355232e4b5a3b3, 1f583d3813f204449037cd2acbfc09168171362a.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 04cc05e3716ae31b17ecdab7bc55c8170def1b8b, 09c9e79f4c10cfb6b9e0e1b4dd355232e4b5a3b3, 1f583d3813f204449037cd2acbfc09168171362a 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: i2c: i801: Don't generate an interrupt on bus reset Now that the i2c-i801 driver supports interrupts, setting the KILL bit in a attempt to recover from a timed out transaction triggers an interrupt. Unfortunately, the interrupt handler (i801_isr) is not prepared for this situation and will try to process the interrupt as if it was signaling the end of a successful transaction. In the case of a block transaction, this can result in an out-of-range memory access. This condition was reproduced several times by syzbot: https://syzkaller.appspot.com/bug?extid=ed71512d469895b5b34e https://syzkaller.appspot.com/bug?extid=8c8dedc0ba9e03f6c79e https://syzkaller.appspot.com/bug?extid=c8ff0b6d6c73d81b610e https://syzkaller.appspot.com/bug?extid=33f6c360821c399d69eb https://syzkaller.appspot.com/bug?extid=be15dc0b1933f04b043a https://syzkaller.appspot.com/bug?extid=b4d3fd1dfd53e90afd79 So disable interrupts while trying to reset the bus. Interrupts will be enabled again for the following transaction.

HighCVSS 7.1 · v3.1—No exploit Fix available
Published
Mar 25, 2024
Updated
Aug 5, 2026
EPSS
0.2% · 14th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 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
7.1
CNA · Linux
7.8
0.7 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.

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  • 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

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  • when exploit code appears or is weaponized
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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 kernel3.6 and later · before 4.4.271
  • linux linux kernel4.5 and later · before 4.9.271
  • linux linux kernel4.10 and later · before 4.14.235
  • linux linux kernel4.15 and later · before 4.19.193
  • linux linux kernel4.20 and later · before 5.4.124
  • linux linux kernel5.5 and later · before 5.10.42
  • linux linux kernel5.11 and later · before 5.12.9
  • linux linux kernel5.13

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
    • 636752bcb5177a301d0266270661581de8624828 and later · before f9469082126cebb7337db3992d143f5e4edfe629affected · git
    • 636752bcb5177a301d0266270661581de8624828 and later · before 09c9e79f4c10cfb6b9e0e1b4dd355232e4b5a3b3affected · git
    • 636752bcb5177a301d0266270661581de8624828 and later · before dfa8929e117b0228a7765f5c3f5988a4a028f3c6affected · git
    • 636752bcb5177a301d0266270661581de8624828 and later · before c70e1ba2e7e65255a0ce004f531dd90dada97a8caffected · git
    • 636752bcb5177a301d0266270661581de8624828 and later · before 04cc05e3716ae31b17ecdab7bc55c8170def1b8baffected · git
    • 636752bcb5177a301d0266270661581de8624828 and later · before b523feb7e8e44652f92f3babb953a976e7ccbbefaffected · git
    • 636752bcb5177a301d0266270661581de8624828 and later · before 1f583d3813f204449037cd2acbfc09168171362aaffected · git
    • 636752bcb5177a301d0266270661581de8624828 and later · before e4d8716c3dcec47f1557024add24e1f3c09eb24baffected · git
    • before 3.6not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8bpftoolbefore 4.18.0-553.5.1.el8_104.18.0-553.5.1.el8_10
AlmaLinux:8kernelbefore 4.18.0-553.5.1.el8_104.18.0-553.5.1.el8_10
AlmaLinux:8kernel-abi-stablelistsbefore 4.18.0-553.5.1.el8_104.18.0-553.5.1.el8_10
AlmaLinux:8kernel-corebefore 4.18.0-553.5.1.el8_104.18.0-553.5.1.el8_10
AlmaLinux:8kernel-cross-headersbefore 4.18.0-553.5.1.el8_104.18.0-553.5.1.el8_10
AlmaLinux:8kernel-debugbefore 4.18.0-553.5.1.el8_104.18.0-553.5.1.el8_10
AlmaLinux:8kernel-debug-corebefore 4.18.0-553.5.1.el8_104.18.0-553.5.1.el8_10
AlmaLinux:8kernel-debug-develbefore 4.18.0-553.5.1.el8_104.18.0-553.5.1.el8_10
AlmaLinux:8kernel-debug-modulesbefore 4.18.0-553.5.1.el8_104.18.0-553.5.1.el8_10
AlmaLinux:8kernel-debug-modules-extrabefore 4.18.0-553.5.1.el8_104.18.0-553.5.1.el8_10
AlmaLinux:8kernel-develbefore 4.18.0-553.5.1.el8_104.18.0-553.5.1.el8_10
AlmaLinux:8kernel-docbefore 4.18.0-553.5.1.el8_104.18.0-553.5.1.el8_10
AlmaLinux:8kernel-headersbefore 4.18.0-553.5.1.el8_104.18.0-553.5.1.el8_10
AlmaLinux:8kernel-modulesbefore 4.18.0-553.5.1.el8_104.18.0-553.5.1.el8_10
AlmaLinux:8kernel-modules-extrabefore 4.18.0-553.5.1.el8_104.18.0-553.5.1.el8_10
AlmaLinux:8kernel-rtbefore 4.18.0-553.5.1.rt7.346.el8_104.18.0-553.5.1.rt7.346.el8_10
AlmaLinux:8kernel-rt-corebefore 4.18.0-553.5.1.rt7.346.el8_104.18.0-553.5.1.rt7.346.el8_10
AlmaLinux:8kernel-rt-debugbefore 4.18.0-553.5.1.rt7.346.el8_104.18.0-553.5.1.rt7.346.el8_10
AlmaLinux:8kernel-rt-debug-corebefore 4.18.0-553.5.1.rt7.346.el8_104.18.0-553.5.1.rt7.346.el8_10
AlmaLinux:8kernel-rt-debug-develbefore 4.18.0-553.5.1.rt7.346.el8_104.18.0-553.5.1.rt7.346.el8_10
AlmaLinux:8kernel-rt-debug-kvmbefore 4.18.0-553.5.1.rt7.346.el8_104.18.0-553.5.1.rt7.346.el8_10
AlmaLinux:8kernel-rt-debug-modulesbefore 4.18.0-553.5.1.rt7.346.el8_104.18.0-553.5.1.rt7.346.el8_10
AlmaLinux:8kernel-rt-debug-modules-extrabefore 4.18.0-553.5.1.rt7.346.el8_104.18.0-553.5.1.rt7.346.el8_10
AlmaLinux:8kernel-rt-develbefore 4.18.0-553.5.1.rt7.346.el8_104.18.0-553.5.1.rt7.346.el8_10

+65

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-2021-47151Mar 25, 2024 · interconnect: qcom: bcm-voter: add a missing of_node_put()
    22Monitor
  • ← EarlierCVE-2021-47152Mar 25, 2024 · mptcp: fix data stream corruption
    22Monitor
  • Later →CVE-2021-47158Mar 25, 2024 · net: dsa: sja1105: add error handling in sja1105_setup()
    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 Linux04cc05e3716ae31b17ecdab7bc55c8170def1b8bVendor (CNA)
Linux Linux09c9e79f4c10cfb6b9e0e1b4dd355232e4b5a3b3Vendor (CNA)
Linux Linux1f583d3813f204449037cd2acbfc09168171362aVendor (CNA)
Linux Linuxb523feb7e8e44652f92f3babb953a976e7ccbbefVendor (CNA)
Linux Linuxc70e1ba2e7e65255a0ce004f531dd90dada97a8cVendor (CNA)
Linux Linuxdfa8929e117b0228a7765f5c3f5988a4a028f3c6Vendor (CNA)
Linux Linuxe4d8716c3dcec47f1557024add24e1f3c09eb24bVendor (CNA)
Linux Linuxf9469082126cebb7337db3992d143f5e4edfe629Vendor (CNA)
almalinux:bpftool4.18.0-553.5.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel4.18.0-553.5.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-abi-stablelists4.18.0-553.5.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-core4.18.0-553.5.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-cross-headers4.18.0-553.5.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug4.18.0-553.5.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-core4.18.0-553.5.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-devel4.18.0-553.5.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-modules4.18.0-553.5.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-modules-extra4.18.0-553.5.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-devel4.18.0-553.5.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-doc4.18.0-553.5.1.el8_10 · AlmaLinux:8Package registry (OSV)
debian:linux5.14.6-1 · Debian:12Package registry (OSV)
red hat:bpftool0:4.18.0-553.5.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:bpftool-debuginfo0:4.18.0-553.5.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel0:4.18.0-553.5.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-abi-stablelists0:4.18.0-553.5.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-core0:4.18.0-553.5.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug0:4.18.0-553.5.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-core0:4.18.0-553.5.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-debuginfo0:4.18.0-553.5.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-devel0:4.18.0-553.5.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)

+5

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).

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
high · data can be read
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
High
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

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

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

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

References

Show all references (7 more)

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

All records