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NVD / CVE Program· CNA Linux

CVE-2026-31412: usb: gadget: f_mass_storage: Fix potential integer overflow in check_command_size_in_blocks()

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: 0.17% (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 228b37936376143f4b60cc6828663f6eaceb81b5, 3428dc5520c811e66622b2f5fa43341bf9a1f8b3, 387ebb0453b99d71491419a5dc4ab4bee0cacbac.

Low priority for now. Upgrade to Linux Linux 228b37936376143f4b60cc6828663f6eaceb81b5, 3428dc5520c811e66622b2f5fa43341bf9a1f8b3, 387ebb0453b99d71491419a5dc4ab4bee0cacbac 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: usb: gadget: f_mass_storage: Fix potential integer overflow in check_command_size_in_blocks() The `check_command_size_in_blocks()` function calculates the data size in bytes by left shifting `common->data_size_from_cmnd` by the block size (`common->curlun->blkbits`). However, it does not validate whether this shift operation will cause an integer overflow. Initially, the block size is set up in `fsg_lun_open()` , and the `common->data_size_from_cmnd` is set up in `do_scsi_command()`. During initialization, there is no integer overflow check for the interaction between two variables. So if a malicious USB host sends a SCSI READ or WRITE command requesting a large amount of data (`common->data_size_from_cmnd`), the left shift operation can wrap around. This results in a truncated data size, which can bypass boundary checks and potentially lead to memory corruption or out-of-bounds accesses. Fix this by using the check_shl_overflow() macro to safely perform the shift and catch any overflows.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Apr 10, 2026
Updated
Jun 17, 2026
EPSS
0.1% · 6th 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 · 0.1%

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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 exploit code appears or is weaponized
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  • 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 kernel3.3 and later · before 6.1.167
  • linux linux kernel6.2 and later · before 6.6.130
  • linux linux kernel6.7 and later · before 6.12.78
  • linux linux kernel6.13 and later · before 6.18.19
  • linux linux kernel6.19 and later · before 6.19.9
  • linux linux kernel7.0

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

    • 3.3affected
    • 144974e7f9e32b53b02f6c8632be45d8f43d6ab5 and later · before 91817ad5452defe69bc7bc0e355f0ed5d01125ccaffected · git
    • 144974e7f9e32b53b02f6c8632be45d8f43d6ab5 and later · before ce0caaed5940162780c5c223b8ae54968a5f059baffected · git
    • 144974e7f9e32b53b02f6c8632be45d8f43d6ab5 and later · before 228b37936376143f4b60cc6828663f6eaceb81b5affected · git
    • 144974e7f9e32b53b02f6c8632be45d8f43d6ab5 and later · before 3428dc5520c811e66622b2f5fa43341bf9a1f8b3affected · git
    • 144974e7f9e32b53b02f6c8632be45d8f43d6ab5 and later · before 387ebb0453b99d71491419a5dc4ab4bee0cacbacaffected · git
    • 144974e7f9e32b53b02f6c8632be45d8f43d6ab5 and later · before 8479891d1f04a8ce55366fe4ca361ccdb96f02e1affected · git
    • before 3.3not affected · semver
    • 6.1.167 and later · up to and including 6.1.*not affected · semver
    • 6.6.130 and later · up to and including 6.6.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.170-16.1.170-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.10-16.19.10-1

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-2026-31411Apr 8, 2026 · net: atm: fix crash due to unvalidated vcc pointer in sigd_send()
    22Monitor
  • ← EarlierCVE-2026-39860Apr 8, 2026 · Nix sandbox escape: file write via symlink at FOD `.tmp` copy destination
    33Monitor
  • Later →CVE-2026-31413Apr 12, 2026 · bpf: Fix unsound scalar forking in maybe_fork_scalars() for BPF_OR
    31Monitor

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 Linux228b37936376143f4b60cc6828663f6eaceb81b5Vendor (CNA)
Linux Linux3428dc5520c811e66622b2f5fa43341bf9a1f8b3Vendor (CNA)
Linux Linux387ebb0453b99d71491419a5dc4ab4bee0cacbacVendor (CNA)
Linux Linux8479891d1f04a8ce55366fe4ca361ccdb96f02e1Vendor (CNA)
Linux Linux91817ad5452defe69bc7bc0e355f0ed5d01125ccVendor (CNA)
Linux Linuxce0caaed5940162780c5c223b8ae54968a5f059bVendor (CNA)
debian:linux6.1.170-1 · 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.

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.

  • CVE-2026-3163314 days apartrxrpc: Fix integer overflow in rxgk_verify_response()
    39Monitor
  • CVE-2026-3164914 days apartnet: stmmac: fix integer underflow in chain mode
    39Monitor
  • CVE-2026-3165914 days apartbatman-adv: reject oversized global TT response buffers
    39Monitor
  • CVE-2026-4334128 days apartnet/ipv6: ioam6: prevent schema length wraparound in trace fill
    39Monitor
  • CVE-2026-4603947 days apartrxgk: Fix potential integer overflow in length check
    39Monitor
  • CVE-2026-4632560 days apartRDMA/rxe: Fix iova-to-va conversion for MR page sizes != PAGE_SIZE
    39Monitor

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
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-190 · Integer Overflow or Wraparound

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.

ATT&CK techniques

—

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