CVE-2025-39700
- Published: 2025-09-05T18:15:47.003
In the Linux kernel, the following vulnerability has been resolved:
mm/damon/ops-common: ignore migration request to invalid nodes
damon_migrate_pages() tries migration even if the target node is invalid.
If users mistakenly make such invalid requests via
DAMOS_MIGRATE_{HOT,COLD} action, the below kernel BUG can happen.
[ 7831.883495] BUG: unable to handle page fault for address: 0000000000001f48
[ 7831.884160] #PF: supervisor read access in kernel mode
[ 7831.884681] #PF: error_code(0x0000) – not-present page
[ 7831.885203] PGD 0 P4D 0
[ 7831.885468] Oops: Oops: 0000 [#1] SMP PTI
[ 7831.885852] CPU: 31 UID: 0 PID: 94202 Comm: kdamond.0 Not tainted 6.16.0-rc5-mm-new-damon+ #93 PREEMPT(voluntary)
[ 7831.886913] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-4.el9 04/01/2014
[ 7831.887777] RIP: 0010:__alloc_frozen_pages_noprof (include/linux/mmzone.h:1724 include/linux/mmzone.h:1750 mm/page_alloc.c:4936 mm/page_alloc.c:5137)
[…]
[ 7831.895953] Call Trace:
[ 7831.896195]
[ 7831.896397] __folio_alloc_noprof (mm/page_alloc.c:5183 mm/page_alloc.c:5192)
[ 7831.896787] migrate_pages_batch (mm/migrate.c:1189 mm/migrate.c:1851)
[ 7831.897228] ? __pfx_alloc_migration_target (mm/migrate.c:2137)
[ 7831.897735] migrate_pages (mm/migrate.c:2078)
[ 7831.898141] ? __pfx_alloc_migration_target (mm/migrate.c:2137)
[ 7831.898664] damon_migrate_folio_list (mm/damon/ops-common.c:321 mm/damon/ops-common.c:354)
[ 7831.899140] damon_migrate_pages (mm/damon/ops-common.c:405)
[…]
Add a target node validity check in damon_migrate_pages(). The validity
check is stolen from that of do_pages_move(), which is being used for the
move_pages() system call.
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How to fix CVE-2025-39700
Description: In the Linux kernel, the following vulnerability has been resolved: mm/damon/ops-common: ignore migration request to invalid nodes damon_migrate_pages() tries migration even if the target node is invalid. If users mistakenly make such invalid requests via DAMOS_MIGRATE_{HOT,COLD} action, the below kernel BUG can happen. [ 7831.883495] BUG: unable to handle page fault for address: 0000000000001f48 [ […]
Exploit Difficulty: HARD
⏱️ Time to exploit: > 4 hours
🛠️ Required skills: Advanced security expertise
💰 Public exploits: Rare or not public
How to Fix:
- Check if you're running the affected product
- Update to the latest patched version
- If patching is not immediately possible: restrict network exposure, apply least-privilege access
- Test the fix in a staging environment first
- Review logs for signs of exploitation
- Monitor for IOCs (Indicators of Compromise)
- Enable automatic security updates
- Set up vulnerability monitoring
- Review and harden security configurations
Exploit Difficulty Assessment
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CVE details first published to NVD database
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Detection Rules & IOCs
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