CVE-2026-90079

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

octeontx2-af: fix cn20k mailbox lifetime on repeated rvu_mbox_init()

rvu_mbox_init() is called separately for AF-PF mailboxes during probe

and for AF-VF mailboxes when SR-IOV is enabled. Each call used to

allocate a new ng_rvu object, leaking the first allocation when the

pointer was overwritten on the second call.

Sharing one ng_rvu across both paths exposed several teardown bugs:

the error path freed all cn20k mailbox DMA and kfree()d ng_rvu even

when only the failing init type should be unwound, leaving live AF-PF

mailbox memory in use after an AF-VF init failure. mutex_init() was

also re-run on the AF-VF path while AF-PF mailbox handlers could still

hold rvu->mbox_lock. Probe and SR-IOV failure paths did not release

cn20k mailbox DMA either, since cleanup only happened in rvu_remove().

Allocate ng_rvu once with devm_kzalloc(), initialize mbox_lock in the

same block, unwind only the mailbox memory for the failing init type,

and free cn20k mailbox DMA from the probe and pci_enable_sriov()

error paths.