CVE-2026-98846

/// Technical description

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

sctp: check RCV_SHUTDOWN after the sendmsg connect wait

sctp_wait_for_connect() drops the socket lock while it sleeps. An

out-of-the-blue ABORT can then be processed from the socket backlog and

unlink the association. If a concurrent shutdown(fd, SHUT_RD) sets

RCV_SHUTDOWN, the waiter breaks with err == 0 before checking

asoc->base.dead. Its final sctp_association_put() can then free the

association, leaving sctp_sendmsg_to_asoc() to continue with a dangling

pointer.

Check RCV_SHUTDOWN along with the wait error in sctp_sendmsg_to_asoc()

before using the association again. The check only accesses the socket,

so it needs no additional association reference. Return the existing

-ESRCH so that sctp_sendmsg() skips freeing a new association that may

already have been destroyed.

Keep sctp_wait_for_connect() unchanged to preserve its behavior for the

connect() caller.

/// 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