CVE-2026-90417

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

RDMA/cxgb4: Fix dereg_skb leak and double free in write_tpt_entry()

When the device is in the fatal error state, write_tpt_entry() returns -EIO

before handing the caller's preallocated skb to the transmit path; its

allocation-failure returns do the same. c4iw_dereg_mr() ignores the error

and frees mhp, leaking mhp->dereg_skb. c4iw_get_dma_mr() instead frees the

skb a second time after dereg_mem() already consumed it, a double free.

Make write_tpt_entry() the sole owner of a non-NULL skb, freeing it on

every return preceding handoff to c4iw_ofld_send(): fatal error, tpt and

stag allocation failure. c4iw_ofld_send() consumes the skb on success and

error alike, so drop the redundant kfree_skb() in c4iw_get_dma_mr() after

dereg_mem().