CVE-2024-26587 net: netdevsim: don't try to destroy PHC on VFs
A null pointer dereference in the Linux kernel netdevsim driver causes a crash when destroying VFs, leading to denial of service.
- 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-2024-26587?
CVE-2024-26587 is a medium-severity vulnerability in Linux kernel, published on 22 Feb 2024. 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:
net: netdevsim: don't try to destroy PHC on VFs
PHC gets initialized in nsim_init_netdevsim(), which is only called if (nsim_dev_port_is_pf()).
Create a counterpart of nsim_init_netdevsim() and move the mock_phc_destroy() there.
This fixes a crash trying to destroy netdevsim with VFs instantiated, as caught by running the devlink.sh test:
BUG: kernel NULL pointer dereference, address: 00000000000000b8 RIP: 0010:mock_phc_destroy+0xd/0x30 Call Trace: <TASK> nsim_destroy+0x4a/0x70 [netdevsim] __nsim_dev_port_del+0x47/0x70 [netdevsim] nsim_dev_reload_destroy+0x105/0x120 [netdevsim] nsim_drv_remove+0x2f/0xb0 [netdevsim] device_release_driver_internal+0x1a1/0x210 bus_remove_device+0xd5/0x120 device_del+0x159/0x490 device_unregister+0x12/0x30 del_device_store+0x11a/0x1a0 [netdevsim] kernfs_fop_write_iter+0x130/0x1d0 vfs_write+0x30b/0x4b0 ksys_write+0x69/0xf0 do_syscall_64+0xcc/0x1e0 entry_SYSCALL_64_after_hwframe+0x6f/0x77
Weakness: CWE-476
Which versions are affected by CVE-2024-26587?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-26587?
Apply the vendor's patch.
Is CVE-2024-26587 being exploited?
There is no known exploitation of CVE-2024-26587 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-35906, BELL-CVE-2024-26587, DEBIAN-CVE-2024-26587, GHSA-vmpq-wpxg-r7rp, UBUNTU-CVE-2024-26587.