CVE-2026-80988NTB: ntb_transport: Fail TX enqueue when the QP link is down

Official description

In the Linux kernel, the following vulnerability has been resolved: NTB: ntb_transport: Fail TX enqueue when the QP link is down Commit f195a1a6fe41 ("ntb: Drop packets when qp link is down") meant to make ntb_transport_tx_enqueue() drop packets submitted while the QP link is down, but it only returns 0 without consuming the packet. Zero means success by this function's contract, so ntb_netdev reports NETDEV_TX_OK and forgets the skb: nothing queued it, nothing frees it, and it leaks, one skb for every transmit racing a link-down. Return -ENOLINK instead, restoring the contract that a non-zero return leaves the buffer owned by the caller. With the preceding patch, ntb_netdev frees the skb on non-retryable enqueue failures and returns NETDEV_TX_OK, so a packet racing with link-down is dropped without leaking or entering a busy retry loop.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/76c9ccc0c6bebfc74c0e727eda67687f5103ab06
• https://git.kernel.org/stable/c/96d792c65b9d5f7f9dd86a1004315db59e450c07
• https://git.kernel.org/stable/c/45cc11035165918dd1f81796ea98f81ece20d361
• https://git.kernel.org/stable/c/e6cc541fab01099fd8efadfa4f13afdf118bf536
• https://git.kernel.org/stable/c/5eca0d899a3be661a7e2caaaa7467a6fa15d756c
• https://git.kernel.org/stable/c/894e136b432da75c0352c80299807a5c4b04f167
• https://git.kernel.org/stable/c/89177732fe1653bbfef10cf5d99bf20cf57762c2
• https://git.kernel.org/stable/c/873ce713fef5dde0939220f04f3484ec86a16fba