CVE-2022-21546 scsi: target: Fix WRITE_SAME No Data Buffer crash
A null pointer dereference in the Linux kernel SCSI target subsystem allows a local attacker to cause a system crash via crafted WRITE_SAME commands.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-21546?
CVE-2022-21546 is a high-severity vulnerability in Debian Debian Linux, published on 2 May 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
scsi: target: Fix WRITE_SAME No Data Buffer crash
In newer version of the SBC specs, we have a NDOB bit that indicates there is no data buffer that gets written out. If this bit is set using commands like "sg_write_same --ndob" we will crash in target_core_iblock/file's execute_write_same handlers when we go to access the se_cmd->t_data_sg because its NULL.
This patch adds a check for the NDOB bit in the common WRITE SAME code because we don't support it. And, it adds a check for zero SG elements in each handler in case the initiator tries to send a normal WRITE SAME with no data buffer.
Weakness: CWE-476
Which versions are affected by CVE-2022-21546?
It affects 2 products.
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2022-21546?
Apply the vendor's patch.
Is CVE-2022-21546 being exploited?
There is no known exploitation of CVE-2022-21546 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2022-21546, GHSA-4f99-6w2j-877c, ROOT-OS-DEBIAN-11-CVE-2022-21546, ROOT-OS-UBUNTU-2204-CVE-2022-21546, UBUNTU-CVE-2022-21546.