CVE-2026-80788: Linux kernel · nvmet-tcp: Do not WARN on remotely-controlled oversized SGL allocations
Source GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 17:16 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 4 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
Description
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
- nvd.nist.gov/vuln/detail/CVE-2026-80788 (opens in a new tab)
- git.kernel.org/stable/c/737a3b535247226f6e1a7988fd9d6e63e7d6fc71 (opens in a new tab)
- git.kernel.org/stable/c/7b6a54d4e7b0da423c2b53ed293fd36b16c0b19e (opens in a new tab)
- git.kernel.org/stable/c/7fd6da0f28932442b51658bac4ff55565ca9b377 (opens in a new tab)
- git.kernel.org/stable/c/86cc450022473c4a29b43a09f3ec22a9ef566dac (opens in a new tab)
- git.kernel.org/stable/c/8d01f0d0e96485e39ad89b859ef85e1dc3020465 (opens in a new tab)
- git.kernel.org/stable/c/9b770e40bc00381e5ebf53653de5776773415be3 (opens in a new tab)
- git.kernel.org/stable/c/9c95f7e66c62ee6c6abedcf1c04311f430ff5833 (opens in a new tab)
- git.kernel.org/stable/c/c509f20be1cabda3087810bb2d658d66b3f31f35 (opens in a new tab)
- git.kernel.org/stable/c/e7077e6c45423dd2bb7de7b5fc4b018a8e6c4741 (opens in a new tab)