CVE-2025-68229 scsi: target: tcm_loop: Fix segfault in tcm_loop_tpg_address_show()
A local attacker can trigger a kernel crash via a null pointer dereference in the tcm_loop SCSI target module when reading configfs attributes.
- 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-2025-68229?
CVE-2025-68229 is a vulnerability in Linux, published on 16 Dec 2025. 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:
scsi: target: tcm_loop: Fix segfault in tcm_loop_tpg_address_show()
If the allocation of tl_hba->sh fails in tcm_loop_driver_probe() and we attempt to dereference it in tcm_loop_tpg_address_show() we will get a segfault, see below for an example. So, check tl_hba->sh before dereferencing it.
Unable to allocate struct scsi_host BUG: kernel NULL pointer dereference, address: 0000000000000194 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 1 PID: 8356 Comm: tokio-runtime-w Not tainted 6.6.104.2-4.azl3 #1 Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1 09/28/2024 RIP: 0010:tcm_loop_tpg_address_show+0x2e/0x50 [tcm_loop] ... Call Trace: <TASK> configfs_read_iter+0x12d/0x1d0 [configfs] vfs_read+0x1b5/0x300 ksys_read+0x6f/0xf0 ...
Which versions are affected by CVE-2025-68229?
How do I fix CVE-2025-68229?
Apply the vendor's patch.
Is CVE-2025-68229 being exploited?
There is no known exploitation of CVE-2025-68229 in the wild and no public exploit code.
Sources
Also known as AZL-72466, BELL-CVE-2025-68229, DEBIAN-CVE-2025-68229, GHSA-984g-3ggq-r83h, ROOT-OS-DEBIAN-12-CVE-2025-68229, ROOT-OS-DEBIAN-13-CVE-2025-68229 and 3 more.