CVE-2025-39843— mm: slub: avoid wake up kswapd in set_track_prepare
Possible ATT&CK Techniques 1AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 12
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 5cf909c553e9efed573811de4b3f5172898d5515< 994b03b9605d36d814c611385fbf90ca6db20aa8 | affected |
5cf909c553e9efed573811de4b3f5172898d5515< 522ffe298627cfe72539d72167c2e20e72b5e856 | affected | ||
5cf909c553e9efed573811de4b3f5172898d5515< 243b705a90ed8449f561a271cf251fd2e939f3db | affected | ||
5cf909c553e9efed573811de4b3f5172898d5515< eb3240ffd243bfb8b1e9dc568d484ecf9fd660ab | affected | ||
5cf909c553e9efed573811de4b3f5172898d5515< 850470a8413a8a78e772c4f6bd9fe81ec6bd5b0f | affected | ||
5.19 | affected | ||
< 5.19 | unaffected | ||
6.1.151≤ 6.1.* | unaffected | ||
| … +4 more rows | |||
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Linux · 2025-09-19 · 30 CVEs total
| CVE-2025-39841 | 9.8 CRITICAL | scsi: lpfc: Fix buffer free/clear order in deferred receive path |
| CVE-2025-39864 | 8.8 HIGH | wifi: cfg80211: fix use-after-free in cmp_bss() |
| CVE-2025-39862 | 8.8 HIGH | wifi: mt76: mt7915: fix list corruption after hardware restart |
| CVE-2025-39839 | 8.8 HIGH | batman-adv: fix OOB read/write in network-coding decode |
| CVE-2025-39848 | 8.8 HIGH | ax25: properly unshare skbs in ax25_kiss_rcv() |
| CVE-2025-39849 | 8.8 HIGH | wifi: cfg80211: sme: cap SSID length in __cfg80211_connect_result() |
| CVE-2025-39860 | 8.0 HIGH | Bluetooth: Fix use-after-free in l2cap_sock_cleanup_listen() |
| CVE-2025-39837 | 7.8 HIGH | platform/x86: asus-wmi: Fix racy registrations |
| CVE-2025-39863 | 7.8 HIGH | wifi: brcmfmac: fix use-after-free when rescheduling brcmf_btcoex_info work |
| CVE-2025-39866 | 7.8 HIGH | fs: writeback: fix use-after-free in __mark_inode_dirty() |
| CVE-2025-39854 | 7.8 HIGH | ice: fix NULL access of tx->in_use in ice_ll_ts_intr |
| CVE-2025-39851 | 7.5 HIGH | vxlan: Fix NPD when refreshing an FDB entry with a nexthop object |
| CVE-2025-39857 | 7.5 HIGH | net/smc: fix one NULL pointer dereference in smc_ib_is_sg_need_sync() |
| CVE-2025-39840 | 7.1 HIGH | audit: fix out-of-bounds read in audit_compare_dname_path() |
| CVE-2025-39846 | pcmcia: Fix a NULL pointer dereference in __iodyn_find_io_region() | |
| CVE-2025-39865 | tee: fix NULL pointer dereference in tee_shm_put | |
| CVE-2025-39838 | cifs: prevent NULL pointer dereference in UTF16 conversion | |
| CVE-2025-39861 | Bluetooth: vhci: Prevent use-after-free by removing debugfs files early | |
| CVE-2025-39859 | ptp: ocp: fix use-after-free bugs causing by ptp_ocp_watchdog | |
| CVE-2025-39842 | ocfs2: prevent release journal inode after journal shutdown |
Showing top 20 of 30 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-74577
net: mpls: initialize rtm_tos in mpls_getroute() - CVE-2026-74576
mm/slab: prevent unbounded recursion in free path with new k - CVE-2026-74574
dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev - CVE-2026-74575
thunderbolt: Prevent XDomain delayed work use-after-free on - CVE-2026-74573
iommu/arm-smmu-v3-iommufd: Require exactly one Stream ID for
Same vendor: Linux
- CVE-2026-74577
net: mpls: initialize rtm_tos in mpls_getroute() - CVE-2026-74576
mm/slab: prevent unbounded recursion in free path with new k - CVE-2026-74574
dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev - CVE-2026-74575
thunderbolt: Prevent XDomain delayed work use-after-free on - CVE-2026-74573
iommu/arm-smmu-v3-iommufd: Require exactly one Stream ID for
V. Comments for CVE-2025-39843
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