CVE-2026-97952

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

sunvdc: unmap LDC cookies when the descriptor send fails

__send_request() maps the request's pages into the LDC channel's map

table (ldc_map_sg()), fills in the descriptor and marks it

VIO_DESC_READY before ringing the doorbell via __vdc_tx_trigger().

When the trigger fails, the error path only prints a message: the

descriptor stays READY and the cookies are never unmapped. The

mapping is normally released in vdc_end_one() when the peer completes

the descriptor - but a descriptor whose doorbell was never sent will

never complete, and since dr->prod is not advanced on failure, the

reset path (vdc_requeue_inflight(), which walks [cons, prod)) never

visits it either. The map table entries are leaked permanently.

Since commit a11f6ca9aef9 ("sunvdc: Do not spin in an infinite loop

when vio_ldc_send() returns EAGAIN") trigger failures occur in

practice under load, so every resulting I/O error also leaks one

request's wort

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References