UBUNTU-CVE-2026-80788

Dashboard / Vulnerabilities / UBUNTU-CVE-2026-80788

UBUNTU-CVE-2026-80788

Summary:

Details: In the Linux kernel, the following vulnerability has been resolved: nvmet-tcp: Do not WARN on remotely-controlled oversized SGL allocations When fuzzing the nvme target code, I tripped a kernel warning in nvmet_tcp_map_data() because the length passed into the allocator is controlled by the remote initiator. A remote initiator that sends a command with an SGL claiming a huge number, can create a scatterlist and iovec allocation of over 1 million entries, which causes the backing kmalloc call to exceed MAX_PAGE_ORDER and then the page allocator will trip on a WARN_ON_ONCE_GFP() message: WARNING: mm/page_alloc.c:5280 __alloc_frozen_pages_noprof Workqueue: nvmet_tcp_wq nvmet_tcp_io_work ... sgl_alloc_order nvmet_tcp_map_data nvmet_tcp_try_recv_pdu As it's never good to trip a kernel warning remotely due to many systems having panic-on-warn enabled, let's silence it by just add GFP_NOWARN to the allocation flags.

References: https://ubuntu.com/security/CVE-2026-80788, https://www.cve.org/CVERecord?id=CVE-2026-80788, https://git.kernel.org/linus/737a3b535247226f6e1a7988fd9d6e63e7d6fc71