i3c: dw: avoid shift-out-of-bounds when DAA assigns no devices
Summary
| CVE | CVE-2026-90386 |
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| State | PUBLISHED |
|---|
| Assigner | Linux |
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| Source Priority | CVE Program / NVD first with legacy fallback |
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| Published | 2026-09-17 17:17:37 UTC |
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| Updated | 2026-09-17 17:17:37 UTC |
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| Description | 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. |
|---|
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|
| CNA |
Linux |
Linux |
affected 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef 5650b013e6bfc14c8b30be727f4a715b01860a08 git |
Not specified |
| CNA |
Linux |
Linux |
affected 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef 63110ccc434e10d9e9d2c7d82ebfa8a6f9cedd94 git |
Not specified |
| CNA |
Linux |
Linux |
affected 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef 3a1c35739efb69e8ec2a868113a0471a01bb8f29 git |
Not specified |
| CNA |
Linux |
Linux |
affected 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef 111f559e5b6461f5f6977275716e6c5d1eb7ea27 git |
Not specified |
| CNA |
Linux |
Linux |
affected 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef 754533e6169d1f10bdef7a6ba9bd7740b524e1d4 git |
Not specified |
| CNA |
Linux |
Linux |
affected 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef 9eaac0cb4ca94e2e32c53c156ae5b813ba7ef90c git |
Not specified |
| CNA |
Linux |
Linux |
affected 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef 618dd640ded6b94bbdb79c798a901ec564797033 git |
Not specified |
| CNA |
Linux |
Linux |
affected 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef 038cf48b3170af26a70bf2dee4f8c3ac910f5176 git |
Not specified |
| CNA |
Linux |
Linux |
affected 5.0 |
Not specified |
| CNA |
Linux |
Linux |
unaffected 5.0 semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 5.10.270 5.10.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 5.15.221 5.15.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.1.188 6.1.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.6.157 6.6.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.12.110 6.12.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.18.52 6.18.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.2.6 7.2.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.3-rc1 * original_commit_for_fix |
Not specified |
References
| Reference | Source | Link | Tags |
|---|
| git.kernel.org/stable/c/63110ccc434e10d9e9d2c7d82ebfa8a6f9cedd94 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/9eaac0cb4ca94e2e32c53c156ae5b813ba7ef90c |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/5650b013e6bfc14c8b30be727f4a715b01860a08 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/038cf48b3170af26a70bf2dee4f8c3ac910f5176 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/3a1c35739efb69e8ec2a868113a0471a01bb8f29 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/618dd640ded6b94bbdb79c798a901ec564797033 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/754533e6169d1f10bdef7a6ba9bd7740b524e1d4 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/111f559e5b6461f5f6977275716e6c5d1eb7ea27 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| CVE Program record |
CVE.ORG |
www.cve.org |
canonical |
| NVD vulnerability detail |
NVD |
nvd.nist.gov |
canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.