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NVD / CVE Program· CNA Linux

CVE-2022-50394: i2c: ismt: Fix an out-of-bounds bug in ismt_access()

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: 0.17% (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 03b7ef7a6c5ca1ff553470166b4919db88b810f6, 233348a04becf133283f0076e20b317302de21d9, 39244cc754829bf707dccd12e2ce37510f5b1f8d.

Low priority for now. Upgrade to Linux Linux 03b7ef7a6c5ca1ff553470166b4919db88b810f6, 233348a04becf133283f0076e20b317302de21d9, 39244cc754829bf707dccd12e2ce37510f5b1f8d 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: ismt: Fix an out-of-bounds bug in ismt_access() When the driver does not check the data from the user, the variable 'data->block[0]' may be very large to cause an out-of-bounds bug. The following log can reveal it: [ 33.995542] i2c i2c-1: ioctl, cmd=0x720, arg=0x7ffcb3dc3a20 [ 33.995978] ismt_smbus 0000:00:05.0: I2C_SMBUS_BLOCK_DATA: WRITE [ 33.996475] ================================================================== [ 33.996995] BUG: KASAN: out-of-bounds in ismt_access.cold+0x374/0x214b [ 33.997473] Read of size 18446744073709551615 at addr ffff88810efcfdb1 by task ismt_poc/485 [ 33.999450] Call Trace: [ 34.001849] memcpy+0x20/0x60 [ 34.002077] ismt_access.cold+0x374/0x214b [ 34.003382] __i2c_smbus_xfer+0x44f/0xfb0 [ 34.004007] i2c_smbus_xfer+0x10a/0x390 [ 34.004291] i2cdev_ioctl_smbus+0x2c8/0x710 [ 34.005196] i2cdev_ioctl+0x5ec/0x74c Fix this bug by checking the size of 'data->block[0]' first.

HighCVSS 7.1 · v3.1—No exploit Fix available
Published
Sep 18, 2025
Updated
Aug 5, 2026
EPSS
0.1% · 6th 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 · 0.1%

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.

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 kernel3.9 and later · before 4.9.337
  • linux linux kernel4.10 and later · before 4.14.303
  • linux linux kernel4.15 and later · before 4.19.270
  • linux linux kernel4.20 and later · before 5.4.229
  • linux linux kernel5.5 and later · before 5.10.163
  • linux linux kernel5.11 and later · before 5.15.86
  • linux linux kernel5.16 and later · before 6.0.16
  • linux linux kernel6.1 and later · before 6.1.2

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

    • 3.9affected
    • 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 and later · before 4a7bb1d93addb2f67e36fed00a53cb7f270d7b7aaffected · git
    • 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 and later · before 03b7ef7a6c5ca1ff553470166b4919db88b810f6affected · git
    • 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 and later · before bfe41d966c860a8ad4c735639d616da270c92735affected · git
    • 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 and later · before cdcbae2c5003747ddfd14e29db9c1d5d7e7c44ddaffected · git
    • 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 and later · before 9ac541a0898e8ec187a3fa7024b9701cffae6bf2affected · git
    • 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 and later · before 96c12fd0ec74641295e1c3c34dea3dce1b6c3422affected · git
    • 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 and later · before a642469d464b2780a25a49b51ae56623c65eac34affected · git
    • 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 and later · before 233348a04becf133283f0076e20b317302de21d9affected · git
    • 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 and later · before 39244cc754829bf707dccd12e2ce37510f5b1f8daffected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.4-16.1.4-1
SUSE:Linux Enterprise Live Patching 12 SP5kernel-defaultbefore 4.12.14-122.280.14.12.14-122.280.1
SUSE:Linux Enterprise Live Patching 12 SP5kgraft-patch-SLE12-SP5_Update_74before 1-8.5.11-8.5.1
SUSE:Linux Enterprise Server 12 SP5-LTSSkernel-sourcebefore 4.12.14-122.280.14.12.14-122.280.1
SUSE:Linux Enterprise Server 12 SP5-LTSSkernel-symsbefore 4.12.14-122.280.14.12.14-122.280.1

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-2022-50392Sep 18, 2025 · ASoC: mediatek: mt8183: fix refcount leak in mt8183_mt6358_ts3a227_max98357_dev_probe()
    22Monitor
  • ← EarlierCVE-2022-50393Sep 18, 2025 · drm/amdgpu: SDMA update use unlocked iterator
    22Monitor
  • Later →CVE-2022-50395Sep 18, 2025 · integrity: Fix memory leakage in keyring allocation error path
    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 Linux03b7ef7a6c5ca1ff553470166b4919db88b810f6Vendor (CNA)
Linux Linux233348a04becf133283f0076e20b317302de21d9Vendor (CNA)
Linux Linux39244cc754829bf707dccd12e2ce37510f5b1f8dVendor (CNA)
Linux Linux4a7bb1d93addb2f67e36fed00a53cb7f270d7b7aVendor (CNA)
Linux Linux96c12fd0ec74641295e1c3c34dea3dce1b6c3422Vendor (CNA)
Linux Linux9ac541a0898e8ec187a3fa7024b9701cffae6bf2Vendor (CNA)
Linux Linuxa642469d464b2780a25a49b51ae56623c65eac34Vendor (CNA)
Linux Linuxbfe41d966c860a8ad4c735639d616da270c92735Vendor (CNA)
Linux Linuxcdcbae2c5003747ddfd14e29db9c1d5d7e7c44ddVendor (CNA)
debian:linux6.1.4-1 · Debian:12Package registry (OSV)
suse:kernel-default4.12.14-122.280.1 · SUSE:Linux Enterprise Live Patching 12 SP5Package registry (OSV)
suse:kernel-source4.12.14-122.280.1 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:kernel-syms4.12.14-122.280.1 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:kgraft-patch-SLE12-SP5_Update_741-8.5.1 · 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
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 (8 more)

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

All records