CVE-2025-38256— io_uring/rsrc: fix folio unpinning
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I. Basic Information for CVE-2025-38256
Vulnerability Information
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Vulnerability Title
io_uring/rsrc: fix folio unpinning
Source: NVD (National Vulnerability Database)
Vulnerability 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]
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于io_uring资源处理中的folio解绑错误，可能导致内存管理异常。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2025-38256
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Same Patch Batch · Linux · 2025-07-09 · 26 CVEs total
| CVE-2025-38252 | cxl/ras: Fix CPER handler device confusion | |
| CVE-2025-38264 | nvme-tcp: sanitize request list handling | |
| CVE-2025-38263 | bcache: fix NULL pointer in cache_set_flush() | |
| CVE-2025-38261 | riscv: save the SR_SUM status over switches | |
| CVE-2025-38262 | tty: serial: uartlite: register uart driver in init | |
| CVE-2025-38260 | btrfs: handle csum tree error with rescue=ibadroots correctly | |
| CVE-2025-38259 | ASoC: codecs: wcd9335: Fix missing free of regulator supplies | |
| CVE-2025-38258 | mm/damon/sysfs-schemes: free old damon_sysfs_scheme_filter->memcg_path on write | |
| CVE-2025-38257 | s390/pkey: Prevent overflow in size calculation for memdup_user() | |
| CVE-2025-38255 | lib/group_cpus: fix NULL pointer dereference from group_cpus_evenly() | |
| CVE-2025-38254 | drm/amd/display: Add sanity checks for drm_edid_raw() | |
| CVE-2025-38253 | HID: wacom: fix crash in wacom_aes_battery_handler() | |
| CVE-2025-38251 | atm: clip: prevent NULL deref in clip_push() | |
| CVE-2025-38238 | scsi: fnic: Fix crash in fnic_wq_cmpl_handler when FDMI times out | |
| CVE-2025-38249 | ALSA: usb-audio: Fix out-of-bounds read in snd_usb_get_audioformat_uac3() | |
| CVE-2025-38250 | Bluetooth: hci_core: Fix use-after-free in vhci_flush() | |
| CVE-2025-38247 | userns and mnt_idmap leak in open_tree_attr(2) | |
| CVE-2025-38248 | bridge: mcast: Fix use-after-free during router port configuration | |
| CVE-2025-38246 | bnxt: properly flush XDP redirect lists | |
| CVE-2025-38244 | smb: client: fix potential deadlock when reconnecting channels |
Showing top 20 of 26 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2025-38256
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