CVE-2025-39843— mm: slub: avoid wake up kswapd in set_track_prepare
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I. Basic Information for CVE-2025-39843
Vulnerability Information
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Vulnerability Title
mm: slub: avoid wake up kswapd in set_track_prepare
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mm: slub: avoid wake up kswapd in set_track_prepare set_track_prepare() can incur lock recursion. The issue is that it is called from hrtimer_start_range_ns holding the per_cpu(hrtimer_bases)[n].lock, but when enabled CONFIG_DEBUG_OBJECTS_TIMERS, may wake up kswapd in set_track_prepare, and try to hold the per_cpu(hrtimer_bases)[n].lock. Avoid deadlock caused by implicitly waking up kswapd by passing in allocation flags, which do not contain __GFP_KSWAPD_RECLAIM in the debug_objects_fill_pool() case. Inside stack depot they are processed by gfp_nested_mask(). Since ___slab_alloc() has preemption disabled, we mask out __GFP_DIRECT_RECLAIM from the flags there. The oops looks something like: BUG: spinlock recursion on CPU#3, swapper/3/0 lock: 0xffffff8a4bf29c80, .magic: dead4ead, .owner: swapper/3/0, .owner_cpu: 3 Hardware name: Qualcomm Technologies, Inc. Popsicle based on SM8850 (DT) Call trace: spin_bug+0x0 _raw_spin_lock_irqsave+0x80 hrtimer_try_to_cancel+0x94 task_contending+0x10c enqueue_dl_entity+0x2a4 dl_server_start+0x74 enqueue_task_fair+0x568 enqueue_task+0xac do_activate_task+0x14c ttwu_do_activate+0xcc try_to_wake_up+0x6c8 default_wake_function+0x20 autoremove_wake_function+0x1c __wake_up+0xac wakeup_kswapd+0x19c wake_all_kswapds+0x78 __alloc_pages_slowpath+0x1ac __alloc_pages_noprof+0x298 stack_depot_save_flags+0x6b0 stack_depot_save+0x14 set_track_prepare+0x5c ___slab_alloc+0xccc __kmalloc_cache_noprof+0x470 __set_page_owner+0x2bc post_alloc_hook[jt]+0x1b8 prep_new_page+0x28 get_page_from_freelist+0x1edc __alloc_pages_noprof+0x13c alloc_slab_page+0x244 allocate_slab+0x7c ___slab_alloc+0x8e8 kmem_cache_alloc_noprof+0x450 debug_objects_fill_pool+0x22c debug_object_activate+0x40 enqueue_hrtimer[jt]+0xdc hrtimer_start_range_ns+0x5f8 ...
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set_track_prepare函数可能导致锁递归，当启用CONFIG_DEBUG_OBJECTS_TIMERS时可能唤醒kswapd并尝试持有相同锁，从而造成死锁。
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-2025-39843
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Same Patch Batch · Linux · 2025-09-19 · 30 CVEs total
| CVE-2025-39851 | vxlan: Fix NPD when refreshing an FDB entry with a nexthop object | |
| CVE-2025-39837 | platform/x86: asus-wmi: Fix racy registrations | |
| CVE-2025-39838 | cifs: prevent NULL pointer dereference in UTF16 conversion | |
| CVE-2025-39839 | batman-adv: fix OOB read/write in network-coding decode | |
| CVE-2025-39840 | audit: fix out-of-bounds read in audit_compare_dname_path() | |
| CVE-2025-39841 | scsi: lpfc: Fix buffer free/clear order in deferred receive path | |
| CVE-2025-39842 | ocfs2: prevent release journal inode after journal shutdown | |
| CVE-2025-39844 | mm: move page table sync declarations to linux/pgtable.h | |
| CVE-2025-39845 | x86/mm/64: define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings() | |
| CVE-2025-39846 | pcmcia: Fix a NULL pointer dereference in __iodyn_find_io_region() | |
| CVE-2025-39847 | ppp: fix memory leak in pad_compress_skb | |
| CVE-2025-39848 | ax25: properly unshare skbs in ax25_kiss_rcv() | |
| CVE-2025-39849 | wifi: cfg80211: sme: cap SSID length in __cfg80211_connect_result() | |
| CVE-2025-39850 | vxlan: Fix NPD in {arp,neigh}_reduce() when using nexthop objects | |
| CVE-2025-39852 | net/tcp: Fix socket memory leak in TCP-AO failure handling for IPv6 | |
| CVE-2025-39866 | fs: writeback: fix use-after-free in __mark_inode_dirty() | |
| CVE-2025-39853 | i40e: Fix potential invalid access when MAC list is empty | |
| CVE-2025-39854 | ice: fix NULL access of tx->in_use in ice_ll_ts_intr | |
| CVE-2025-39856 | net: ethernet: ti: am65-cpsw-nuss: Fix null pointer dereference for ndev | |
| CVE-2025-39855 | ice: fix NULL access of tx->in_use in ice_ptp_ts_irq |
Showing top 20 of 30 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-2025-39843
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