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NVD / CVE Program· CNA Linux

CVE-2026-90386: i3c: dw: avoid shift-out-of-bounds when DAA assigns no devices

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.22% (FIRST EPSS).
  • Fixed version: Linux Linux 038cf48b3170af26a70bf2dee4f8c3ac910f5176, 111f559e5b6461f5f6977275716e6c5d1eb7ea27, 3a1c35739efb69e8ec2a868113a0471a01bb8f29.

Low priority for now. Upgrade to Linux Linux 038cf48b3170af26a70bf2dee4f8c3ac910f5176, 111f559e5b6461f5f6977275716e6c5d1eb7ea27, 3a1c35739efb69e8ec2a868113a0471a01bb8f29 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: i3c: dw: avoid shift-out-of-bounds when DAA assigns no devices On an empty bus ENTDAA assigns nothing, so cmd->rx_len (the count of addresses left unassigned) equals master->maxdevs. The GENMASK() index master->maxdevs - cmd->rx_len - 1 then becomes -1, which trips up UBSAN. This happens every time on boot on a Gigabyte/AMD server: UBSAN: shift-out-of-bounds in drivers/i3c/master/dw-i3c-master.c:905:12 shift exponent 64 is too large for 64-bit type 'long unsigned int' CPU: 7 UID: 0 PID: 963 Comm: (udev-worker) Not tainted 7.0.11-200.fc44.x86_64 #1 PREEMPT(lazy) Hardware name: Giga Computing E163-Z34-AAH1-000/MZ33-DC1-000, BIOS R32_F45 04/01/2026 Call Trace: <TASK> dump_stack_lvl+0x5d/0x80 ubsan_epilogue+0x5/0x2b __ubsan_handle_shift_out_of_bounds.cold+0xd7/0x1ab dw_i3c_master_daa.cold+0x1b/0x96 [dw_i3c_master] i3c_master_do_daa_ext.part.0+0x3e/0xf0 [i3c] Skip the mask when no new device was assigned.

—No exploit Fix available
Published
Sep 17, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 12th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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  • Not in KEV: no record of exploitation in the wild
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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.

—

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

    • 5.0affected
    • 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef and later · before 5650b013e6bfc14c8b30be727f4a715b01860a08affected · git
    • 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef and later · before 63110ccc434e10d9e9d2c7d82ebfa8a6f9cedd94affected · git
    • 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef and later · before 3a1c35739efb69e8ec2a868113a0471a01bb8f29affected · git
    • 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef and later · before 111f559e5b6461f5f6977275716e6c5d1eb7ea27affected · git
    • 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef and later · before 754533e6169d1f10bdef7a6ba9bd7740b524e1d4affected · git
    • 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef and later · before 9eaac0cb4ca94e2e32c53c156ae5b813ba7ef90caffected · git
    • 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef and later · before 618dd640ded6b94bbdb79c798a901ec564797033affected · git
    • 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef and later · before 038cf48b3170af26a70bf2dee4f8c3ac910f5176affected · git
    • before 5.0not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-90384Sep 17, 2026 · iomap: release the folio batch on iomap callback failures
    0Monitor
  • ← EarlierCVE-2026-90385Sep 17, 2026 · md/raid1: create serial pool adding rdev to array with serialize_policy=1
    0Monitor
  • Later →CVE-2026-90387Sep 17, 2026 · swiotlb: Preserve allocation virtual address for dynamic pools
    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 Linux038cf48b3170af26a70bf2dee4f8c3ac910f5176Vendor (CNA)
Linux Linux111f559e5b6461f5f6977275716e6c5d1eb7ea27Vendor (CNA)
Linux Linux3a1c35739efb69e8ec2a868113a0471a01bb8f29Vendor (CNA)
Linux Linux5650b013e6bfc14c8b30be727f4a715b01860a08Vendor (CNA)
Linux Linux618dd640ded6b94bbdb79c798a901ec564797033Vendor (CNA)
Linux Linux63110ccc434e10d9e9d2c7d82ebfa8a6f9cedd94Vendor (CNA)
Linux Linux754533e6169d1f10bdef7a6ba9bd7740b524e1d4Vendor (CNA)
Linux Linux9eaac0cb4ca94e2e32c53c156ae5b813ba7ef90cVendor (CNA)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · 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.

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.

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

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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✗ → ✓

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References

Show all references (7 more)

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

All records