CVE-2026-31595 PCI: endpoint: pci-epf-vntb: Stop cmd_handler work in epf_ntb_epc_cleanup
A use-after-free vulnerability in the Linux kernel PCI endpoint driver allows attackers to cause a system crash by triggering a race condition during cleanup.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-31595?
CVE-2026-31595 is a medium-severity use after free vulnerability in Linux kernel, published on 24 Apr 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:
PCI: endpoint: pci-epf-vntb: Stop cmd_handler work in epf_ntb_epc_cleanup
Disable the delayed work before clearing BAR mappings and doorbells to avoid running the handler after resources have been torn down.
Unable to handle kernel paging request at virtual address ffff800083f46004 [...] Internal error: Oops: 0000000096000007 [#1] SMP [...] Call trace: epf_ntb_cmd_handler+0x54/0x200 [pci_epf_vntb] (P) process_one_work+0x154/0x3b0 worker_thread+0x2c8/0x400 kthread+0x148/0x210 ret_from_fork+0x10/0x20
Which versions are affected by CVE-2026-31595?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-31595?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-31595 being exploited?
There is no known exploitation of CVE-2026-31595 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-83855, BELL-CVE-2026-31595, DEBIAN-CVE-2026-31595, GHSA-rr6w-wv7x-7vhx, ROOT-OS-DEBIAN-12-CVE-2026-31595, ROOT-OS-UBUNTU-2204-CVE-2026-31595 and 2 more.