CVE-2025-38256

MEDIUM EPSS 3.3%
Published Jul 9, 202511mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Jul 9, 2025 11mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: io_uring/rsrc: fix folio unpinning syzbot complains about an unmapping failure: [ 108.070381][ T14] kernel BUG at mm/gup.c:71! [ 108.070502][ T14] Internal error: Oops - BUG: 00000000f2000800 [#1] SMP [ 108.123672][ T14] Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20250221-8.fc42 02/21/2025 [ 108.127458][ T14] Workqueue: iou_exit io_ring_exit_work [ 108.174205][ T14] Call trace: [ 108.175649][ T14] sanity_check_pinned_pages+0x7cc/0x7d0 (P) [ 108.178138][ T14] unpin_user_page+0x80/0x10c [ 108.180189][ T14] io_release_ubuf+0x84/0xf8 [ 108.182196][ T14] io_free_rsrc_node+0x250/0x57c [ 108.184345][ T14] io_rsrc_data_free+0x148/0x298 [ 108.186493][ T14] io_sqe_buffers_unregister+0x84/0xa0 [ 108.188991][ T14] io_ring_ctx_free+0x48/0x480 [ 108.191057][ T14] io_ring_exit_work+0x764/0x7d8 [ 108.193207][ T14] process_one_work+0x7e8/0x155c [ 108.195431][ T14] worker_thread+0x958/0xed8 [ 108.197561][ T14] kthread+0x5fc/0x75c [ 108.199362][ T14] ret_from_fork+0x10/0x20 We can pin a tail page of a folio, but then io_uring will try to unpin the head page of the folio. While it should be fine in terms of keeping the page actually alive, mm folks say it's wrong and triggers a debug warning. Use unpin_user_folio() instead of unpin_user_page*. [axboe: adapt to current tree, massage commit message]

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
3.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 5

VendorProductVersionRange
linuxlinux_kernel*≥6.12  –  <6.12.36
linuxlinux_kernel*≥6.13  –  <6.15.5
linuxlinux_kernel6.16any
linuxlinux_kernel6.16any
linuxlinux_kernel6.16any

References 3

  • git.kernel.org https://git.kernel.org/stable/c/11e7b7369e655e6131387b174218d7fa9557b3da
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/53fd75f25b223878b5fff14932e3a22f42b54f77
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5afb4bf9fc62d828647647ec31745083637132e4
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/11e7b7369e655e6131387b174218d7fa9557b3da
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/53fd75f25b223878b5fff14932e3a22f42b54f77
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5afb4bf9fc62d828647647ec31745083637132e4
    Patch