CVE-2026-72330

Status: UPDATED  |  Advisory ID: CVE-2026-72330

Key Details

Affected Products, Subsystems & Sectors

What to Know

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

net/tls: Consume empty data records in tls_sw_read_sock()

A peer may send a zero-length TLS application_data record; TLS 1.3

explicitly permits these as a traffic-analysis countermeasure (RFC

8446, Section 5.1). After decryption such a record has full_len ==

0. tls_sw_read_sock() hands it to the read_actor, which has no

payload to consume and returns zero. The loop treats a zero return

as backpressure (used <= 0), requeues the skb at the head of

rx_list, and stops. rx_list is serviced head-first on the next

call, so the empty record is dequeued, fails the same way, and is

requeued again; every later record on the connection is blocked

behind it.

tls_sw_recvmsg() does not stall on this: a zero-length data record

copies nothing and falls through to consume_skb(). Mirror that in

the read_sock() path by recognizing an empty data record before

the actor runs, consuming it, and continuing. (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References