CVE-2025-68324 scsi: imm: Fix use-after-free bug caused by unfinished delayed work
A use-after-free vulnerability in the Linux kernel's IMM SCSI driver allows local attackers to cause a denial of service or potentially execute code via a race condition during device detachment.
- 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-2025-68324?
CVE-2025-68324 is an use after free vulnerability in Linux, published on 18 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: imm: Fix use-after-free bug caused by unfinished delayed work
The delayed work item 'imm_tq' is initialized in imm_attach() and scheduled via imm_queuecommand() for processing SCSI commands. When the IMM parallel port SCSI host adapter is detached through imm_detach(), the imm_struct device instance is deallocated.
However, the delayed work might still be pending or executing when imm_detach() is called, leading to use-after-free bugs when the work function imm_interrupt() accesses the already freed imm_struct memory.
The race condition can occur as follows:
CPU 0(detach thread) | CPU 1 | imm_queuecommand() | imm_queuecommand_lck() imm_detach() | schedule_delayed_work() kfree(dev) //FREE | imm_interrupt() | dev = container_of(...) //USE dev-> //USE
Add disable_delayed_work_sync() in imm_detach() to guarantee proper cancellation of the delayed work item before imm_struct is deallocated.
Which versions are affected by CVE-2025-68324?
How do I fix CVE-2025-68324?
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-2025-68324 being exploited?
There is no known exploitation of CVE-2025-68324 in the wild and no public exploit code.
Sources
Also known as AZL-72742, BELL-CVE-2025-68324, DEBIAN-CVE-2025-68324, GHSA-v78j-7qmc-c42v, ROOT-OS-DEBIAN-11-CVE-2025-68324, ROOT-OS-DEBIAN-12-CVE-2025-68324 and 4 more.