In the Linux kernel, the following vulnerability has been resolved:
VMCI: fix race between vmci_host_setup_notify and vmci_ctx_unset_notify
During our test, it is found that a warning can be trigger in try_grab_folio
as follow:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 1678 at mm/gup.c:147 try_grab_folio+0x106/0x130
Modules linked in:
CPU: 0 UID: 0 PID: 1678 Comm: syz.3.31 Not tainted 6.15.0-rc5 #163 PREEMPT(undef)
RIP: 0010:try_grab_folio+0x106/0x130
Call Trace:
<TASK>
follow_huge_pmd+0x240/0x8e0
follow_pmd_mask.constprop.0.isra.0+0x40b/0x5c0
follow_pud_mask.constprop.0.isra.0+0x14a/0x170
follow_page_mask+0x1c2/0x1f0
__get_user_pages+0x176/0x950
__gup_longterm_locked+0x15b/0x1060
? gup_fast+0x120/0x1f0
gup_fast_fallback+0x17e/0x230
get_user_pages_fast+0x5f/0x80
vmci_host_unlocked_ioctl+0x21c/0xf80
RIP: 0033:0x54d2cd
---[ end trace 0000000000000000 ]---
Digging into the source, context->notify_page may init by get_user_pages_fast
and can be seen in vmci_ctx_unset_notify which will try to put_page. However
get_user_pages_fast is not finished here and lead to following
try_grab_folio warning. The race condition is shown as follow:
cpu0 cpu1
vmci_host_do_set_notify
vmci_host_setup_notify
get_user_pages_fast(uva, 1, FOLL_WRITE, &context->notify_page);
lockless_pages_from_mm
gup_pgd_range
gup_huge_pmd // update &context->notify_page
vmci_host_do_set_notify
vmci_ctx_unset_notify
notify_page = context->notify_page;
if (notify_page)
put_page(notify_page); // page is freed
__gup_longterm_locked
__get_user_pages
follow_trans_huge_pmd
try_grab_folio // warn here
To slove this, use local variable page to make notify_page can be seen
after finish get_user_pages_fast.
References
Configurations
Configuration 1 (hide)
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Configuration 2 (hide)
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History
16 Dec 2025, 17:10
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Linux
Debian Debian debian Linux Linux linux Kernel |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.0 |
| CPE | cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
|
| References | () https://git.kernel.org/stable/c/00ddc7dad55b7bbb78df80d6e174d0c4764dea0c - Patch | |
| References | () https://git.kernel.org/stable/c/1bd6406fb5f36c2bb1e96e27d4c3e9f4d09edde4 - Patch | |
| References | () https://git.kernel.org/stable/c/468aec888f838ce5174b96e0cb4396790d6f60ca - Patch | |
| References | () https://git.kernel.org/stable/c/58a90db70aa6616411e5f69d1982d9b1dd97d774 - Patch | |
| References | () https://git.kernel.org/stable/c/6e3af836805ed1d7a699f76ec798626198917aa4 - Patch | |
| References | () https://git.kernel.org/stable/c/74095bbbb19ca74a0368d857603a2438c88ca86c - Patch | |
| References | () https://git.kernel.org/stable/c/75b5313c80c39a26d27cbb602f968a05576c36f9 - Patch | |
| References | () https://git.kernel.org/stable/c/b4209e4b778e4e57d0636e1c9fc07a924dbc6043 - Patch | |
| References | () https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html - Third Party Advisory, Mailing List | |
| References | () https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html - Third Party Advisory, Mailing List | |
| CWE | CWE-362 |
03 Nov 2025, 18:16
| Type | Values Removed | Values Added |
|---|---|---|
| References |
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17 Jul 2025, 17:15
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
|
| Summary |
|
03 Jul 2025, 09:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2025-07-03 09:15
Updated : 2025-12-16 17:10
NVD link : CVE-2025-38102
Mitre link : CVE-2025-38102
CVE.ORG link : CVE-2025-38102
JSON object : View
Products Affected
debian
- debian_linux
linux
- linux_kernel
CWE
CWE-362
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')