Bug 2422761 (CVE-2025-68265)

Summary:	CVE-2025-68265 kernel: Linux kernel: Denial of Service in NVMe driver due to use-after-free vulnerability
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	Keywords:	Security
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel’s NVMe host driver (drivers/nvme/host/core.c) related to the lifetime management of the controller’s admin request queue. Under certain conditions, namespaces could retain stale references to the controller’s admin request queue after the controller was torn down. Accessing these stale references could lead to a use-after-free condition in the kernel, potentially resulting in memory corruption or system instability.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2025-12-16 15:02:47 UTC

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

nvme: fix admin request_queue lifetime

The namespaces can access the controller's admin request_queue, and
stale references on the namespaces may exist after tearing down the
controller. Ensure the admin request_queue is active by moving the
controller's 'put' to after all controller references have been released
to ensure no one is can access the request_queue. This fixes a reported
use-after-free bug:

  BUG: KASAN: slab-use-after-free in blk_queue_enter+0x41c/0x4a0
  Read of size 8 at addr ffff88c0a53819f8 by task nvme/3287
  CPU: 67 UID: 0 PID: 3287 Comm: nvme Tainted: G            E       6.13.2-ga1582f1a031e #15
  Tainted: [E]=UNSIGNED_MODULE
  Hardware name: Jabil /EGS 2S MB1, BIOS 1.00 06/18/2025
  Call Trace:
   <TASK>
   dump_stack_lvl+0x4f/0x60
   print_report+0xc4/0x620
   ? _raw_spin_lock_irqsave+0x70/0xb0
   ? _raw_read_unlock_irqrestore+0x30/0x30
   ? blk_queue_enter+0x41c/0x4a0
   kasan_report+0xab/0xe0
   ? blk_queue_enter+0x41c/0x4a0
   blk_queue_enter+0x41c/0x4a0
   ? __irq_work_queue_local+0x75/0x1d0
   ? blk_queue_start_drain+0x70/0x70
   ? irq_work_queue+0x18/0x20
   ? vprintk_emit.part.0+0x1cc/0x350
   ? wake_up_klogd_work_func+0x60/0x60
   blk_mq_alloc_request+0x2b7/0x6b0
   ? __blk_mq_alloc_requests+0x1060/0x1060
   ? __switch_to+0x5b7/0x1060
   nvme_submit_user_cmd+0xa9/0x330
   nvme_user_cmd.isra.0+0x240/0x3f0
   ? force_sigsegv+0xe0/0xe0
   ? nvme_user_cmd64+0x400/0x400
   ? vfs_fileattr_set+0x9b0/0x9b0
   ? cgroup_update_frozen_flag+0x24/0x1c0
   ? cgroup_leave_frozen+0x204/0x330
   ? nvme_ioctl+0x7c/0x2c0
   blkdev_ioctl+0x1a8/0x4d0
   ? blkdev_common_ioctl+0x1930/0x1930
   ? fdget+0x54/0x380
   __x64_sys_ioctl+0x129/0x190
   do_syscall_64+0x5b/0x160
   entry_SYSCALL_64_after_hwframe+0x4b/0x53
  RIP: 0033:0x7f765f703b0b
  Code: ff ff ff 85 c0 79 9b 49 c7 c4 ff ff ff ff 5b 5d 4c 89 e0 41 5c c3 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d dd 52 0f 00 f7 d8 64 89 01 48
  RSP: 002b:00007ffe2cefe808 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
  RAX: ffffffffffffffda RBX: 00007ffe2cefe860 RCX: 00007f765f703b0b
  RDX: 00007ffe2cefe860 RSI: 00000000c0484e41 RDI: 0000000000000003
  RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000000
  R10: 00007f765f611d50 R11: 0000000000000202 R12: 0000000000000003
  R13: 00000000c0484e41 R14: 0000000000000001 R15: 00007ffe2cefea60
   </TASK>

Comment 1 Alexander B 2025-12-16 22:10:02 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025121609-CVE-2025-68265-4800@gregkh/T