CVE-2026-80788None▾ SunlitIn 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 t…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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.
Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < 8d01f0d0e96485e39ad89b859ef85e1dc3020465Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < 7b6a54d4e7b0da423c2b53ed293fd36b16c0b19eLinux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < e7077e6c45423dd2bb7de7b5fc4b018a8e6c4741Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < 86cc450022473c4a29b43a09f3ec22a9ef566dacLinux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < c509f20be1cabda3087810bb2d658d66b3f31f35Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < 9c95f7e66c62ee6c6abedcf1c04311f430ff5833Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < 7fd6da0f28932442b51658bac4ff55565ca9b377Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < 9b770e40bc00381e5ebf53653de5776773415be3Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < 737a3b535247226f6e1a7988fd9d6e63e7d6fc71Linux 5.0Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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