In the Linux kernel, the following vulnerability has been resolved:
cxl/features: Serialize multi-part Get/Set Feature transfers
A Get or Set Feature payload larger than the mailbox payload size is
split into several mailbox commands. mbox_mutex only serializes
individual mailbox commands and is dropped between iterations of these
loops. Nothing serializes the multi-part transfer as a whole.
cxl_get_feature() and cxl_set_feature() are reachable concurrently
from fwctl (per-fd RPCs run under a read-held registration lock) and
from the EDAC scrub/ECS/repair paths, so two transfers to the same
mailbox can interleave their parts and corrupt the device's transfer
context.
Add a per-mailbox feat_mutex and hold it across the whole transfer in
both functions. It nests outside mbox_mutex (which is taken inside
cxl_internal_send_cmd()), and is taken nowhere else, so no lock-ordering
inversion is introduced.
cxl/features: Serialize multi-part Get/Set Feature transfers
A Get or Set Feature payload larger than the mailbox payload size is
split into several mailbox commands. mbox_mutex only serializes
individual mailbox commands and is dropped between iterations of these
loops. Nothing serializes the multi-part transfer as a whole.
cxl_get_feature() and cxl_set_feature() are reachable concurrently
from fwctl (per-fd RPCs run under a read-held registration lock) and
from the EDAC scrub/ECS/repair paths, so two transfers to the same
mailbox can interleave their parts and corrupt the device's transfer
context.
Add a per-mailbox feat_mutex and hold it across the whole transfer in
both functions. It nests outside mbox_mutex (which is taken inside
cxl_internal_send_cmd()), and is taken nowhere else, so no lock-ordering
inversion is introduced.
Metrics
Affected Vendors & Products
Advisories
No advisories yet.
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Thu, 17 Sep 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | In the Linux kernel, the following vulnerability has been resolved: cxl/features: Serialize multi-part Get/Set Feature transfers A Get or Set Feature payload larger than the mailbox payload size is split into several mailbox commands. mbox_mutex only serializes individual mailbox commands and is dropped between iterations of these loops. Nothing serializes the multi-part transfer as a whole. cxl_get_feature() and cxl_set_feature() are reachable concurrently from fwctl (per-fd RPCs run under a read-held registration lock) and from the EDAC scrub/ECS/repair paths, so two transfers to the same mailbox can interleave their parts and corrupt the device's transfer context. Add a per-mailbox feat_mutex and hold it across the whole transfer in both functions. It nests outside mbox_mutex (which is taken inside cxl_internal_send_cmd()), and is taken nowhere else, so no lock-ordering inversion is introduced. | |
| Title | cxl/features: Serialize multi-part Get/Set Feature transfers | |
| First Time appeared |
Linux
Linux linux Kernel |
|
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Linux
Linux linux Kernel |
|
| References |
|
Projects
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MITRE
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-09-17T16:11:10.359Z
Reserved: 2026-09-17T16:02:15.084Z
Link: CVE-2026-93096
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-09-17T17:18:03.713
Modified: 2026-09-17T17:18:03.713
Link: CVE-2026-93096
Redhat
No data.
OpenCVE Enrichment
No data.
Weaknesses
No weakness.