CVE-2026-72045 octeontx2-af: cn10k: restrict VF LMTLINE sharing to its own PF
A missing authorization check in the Linux kernel octeontx2-af driver allows a virtual function to read physical memory addresses from other functions, potentially leading to privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-72045?
CVE-2026-72045 is a high-severity missing authorization vulnerability in Linux, published on 15 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
octeontx2-af: cn10k: restrict VF LMTLINE sharing to its own PF
rvu_mbox_handler_lmtst_tbl_setup() uses req->base_pcifunc as a direct index into the LMT map table to read another function's LMTLINE physical base address and copy it into the caller's own LMT map table entry. The mailbox dispatcher authenticates req->hdr.pcifunc from the IRQ source, but req->base_pcifunc is a separate payload field and is not sanitized.
Reject the request with -EPERM when a VF caller's base_pcifunc is not a valid function under its own PF. is_pf_func_valid() bounds the FUNC field to the PF's configured VF count, keeping the computed index inside the caller's own slot block.
Weakness: CWE-862
Which versions are affected by CVE-2026-72045?
How do I fix CVE-2026-72045?
Apply the vendor's patch.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-72045 being exploited?
There is no known exploitation of CVE-2026-72045 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-72045, DEBIAN-CVE-2026-72045, GHSA-5g45-v3m4-8hc5, UBUNTU-CVE-2026-72045.