CVE-2026-22983

Technical Description

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

net: do not write to msg_get_inq in callee

NULL pointer dereference fix.

msg_get_inq is an input field from caller to callee. Don't set it in

the callee, as the caller may not clear it on struct reuse.

This is a kernel-internal variant of msghdr only, and the only user

does reinitialize the field. So this is not critical for that reason.

But it is more robust to avoid the write, and slightly simpler code.

And it fixes a bug, see below.

Callers set msg_get_inq to request the input queue length to be

returned in msg_inq. This is equivalent to but independent from the

SO_INQ request to return that same info as a cmsg (tp->recvmsg_inq).

To reduce branching in the hot path the second also sets the msg_inq.

That is WAI.

This is a fix to commit 4d1442979e4a ("af_unix: don't post cmsg for

SO_INQ unless explicitly asked for"), which fixed the inverse.

Also avoid NULL pointer dereference in unix_stream_read_generic if

sta

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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.

Affected Products

References