CVE-2026-80788
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.
Affected versions
Linux kernel versions
5.0
and later are affected. Fixed in
5.10.267,
5.15.218,
6.1.185,
6.6.154,
6.12.106,
6.18.47,
7.1.11,
7.2.1,
7.3
and their respective stable series.
References
9 totalFrequently asked questions
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What is CVE-2026-80788?
CVE-2026-80788 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.0 onward and has been patched in 5.10.267, 5.15.218, 6.1.185 and others. CVE-2026-80788 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-80788?
Yes. CVE-2026-80788 has been patched. Fixed versions include 5.10.267, 5.15.218, 6.1.185 and others. If you are running Linux kernel 5.0 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-80788 actively exploited?
No. CVE-2026-80788 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.