CVE-2025-21873 scsi: ufs: core: bsg: Fix crash when arpmb command fails
A local attacker can cause a kernel crash in the UFS driver by triggering an ARPMB command failure, leading to a 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-2025-21873?
CVE-2025-21873 is a medium-severity vulnerability in Linux kernel, published on 27 Mar 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: ufs: core: bsg: Fix crash when arpmb command fails
If the device doesn't support arpmb we'll crash due to copying user data in bsg_transport_sg_io_fn().
In the case where ufs_bsg_exec_advanced_rpmb_req() returns an error, do not set the job's reply_len.
Memory crash backtrace: 3,1290,531166405,-;ufshcd 0000:00:12.5: ARPMB OP failed: error code -22
4,1308,531166555,-;Call Trace:
4,1309,531166559,-; <TASK>
4,1310,531166565,-; ? show_regs+0x6d/0x80
4,1311,531166575,-; ? die+0x37/0xa0
4,1312,531166583,-; ? do_trap+0xd4/0xf0
4,1313,531166593,-; ? do_error_trap+0x71/0xb0
4,1314,531166601,-; ? usercopy_abort+0x6c/0x80
4,1315,531166610,-; ? exc_invalid_op+0x52/0x80
4,1316,531166622,-; ? usercopy_abort+0x6c/0x80
4,1317,531166630,-; ? asm_exc_invalid_op+0x1b/0x20
4,1318,531166643,-; ? usercopy_abort+0x6c/0x80
4,1319,531166652,-; __check_heap_object+0xe3/0x120
4,1320,531166661,-; check_heap_object+0x185/0x1d0
4,1321,531166670,-; __check_object_size.part.0+0x72/0x150
4,1322,531166679,-; __check_object_size+0x23/0x30
4,1323,531166688,-; bsg_transport_sg_io_fn+0x314/0x3b0
Which versions are affected by CVE-2025-21873?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-21873?
Apply the vendor's patch.
Is CVE-2025-21873 being exploited?
There is no known exploitation of CVE-2025-21873 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-21873, DEBIAN-CVE-2025-21873, GHSA-69qf-f58q-rm7m, ROOT-OS-UBUNTU-2404-CVE-2025-21873, UBUNTU-CVE-2025-21873.