CVE-2026-98724 nvmet: pci-epf: reject too-short SGL segments
A host-controlled SGL length in the Linux kernel NVMe PCI endpoint driver causes an out-of-bounds read, potentially leading to kernel panic or code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-98724?
CVE-2026-98724 is a memory corruption vulnerability in Linux, published on 18 Oct 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:
nvmet: pci-epf: reject too-short SGL segments
The host controls an SGL segment's length. A nonzero length smaller than one SGL descriptor makes nr_descs zero, so nvmet_pci_epf_get_sgl_segment() reads the type byte of sgls[-1] outside the allocated buffer. If that byte contains a segment descriptor type, the function also copies the preceding 16 bytes and returns a negative descriptor count.
The read was reproduced in 3/3 KASAN boots with only the host transfer mocked by a KUnit test:
BUG: KASAN: slab-out-of-bounds in nvmet_pci_epf_get_sgl_segment Read of size 1 by task kunit_try_catch Call Trace: nvmet_pci_epf_get_sgl_segment nvmet_pci_epf_short_sgl_test Kernel panic - not syncing: KASAN: panic_on_warn set ...
Reject segments that cannot hold one descriptor before allocating or transferring their contents.
Which versions are affected by CVE-2026-98724?
How do I fix CVE-2026-98724?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-98724 being exploited?
There is no known exploitation of CVE-2026-98724 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-98724, DEBIAN-CVE-2026-98724, GHSA-hhpp-pj9h-fh67, UBUNTU-CVE-2026-98724.