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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database

Vulnerability Change Records for CVE-2025-21633

Change History

New CVE Received from kernel.org 1/19/2025 6:15:08 AM

Action Type Old Value New Value
Added Description 

								
							
							
								
							
						
								
							
								
In the Linux kernel, the following vulnerability has been resolved:

io_uring/sqpoll: zero sqd->thread on tctx errors

Syzkeller reports:

BUG: KASAN: slab-use-after-free in thread_group_cputime+0x409/0x700 kernel/sched/cputime.c:341
Read of size 8 at addr ffff88803578c510 by task syz.2.3223/27552
 Call Trace:
  <TASK>
  ...
  kasan_report+0x143/0x180 mm/kasan/report.c:602
  thread_group_cputime+0x409/0x700 kernel/sched/cputime.c:341
  thread_group_cputime_adjusted+0xa6/0x340 kernel/sched/cputime.c:639
  getrusage+0x1000/0x1340 kernel/sys.c:1863
  io_uring_show_fdinfo+0xdfe/0x1770 io_uring/fdinfo.c:197
  seq_show+0x608/0x770 fs/proc/fd.c:68
  ...

That's due to sqd->task not being cleared properly in cases where
SQPOLL task tctx setup fails, which can essentially only happen with
fault injection to insert allocation errors.

								
								
					

					

						Added
						Reference
						
							
							
								
							
								

								
							
							
								
							
						
								
							
								
https://git.kernel.org/stable/c/4b7cfa8b6c28a9fa22b86894166a1a34f6d630ba

								
								
					

					

						Added
						Reference
						
							
							
								
							
								

								
							
							
								
							
						
								
							
								
https://git.kernel.org/stable/c/aa7496d668c30ca7421b3bfdcd948ee861a13d17