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CVE-2025-39737— mm/kmemleak: avoid soft lockup in __kmemleak_do_cleanup()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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__kmemleak_do_cleanup函数处理大量kmemleak对象时可能导致软锁定。

AI Predicted 5.5 Difficulty: Theoretical EPSS 0.17% · P7

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 2abd839aa7e615f2bbc50c8ba7deb9e40d186768< 9f1f4e95031f84867c5821540466d62f88dab8ca affected
2abd839aa7e615f2bbc50c8ba7deb9e40d186768< 1ef72a7fedc5bca70e8cc980985790de10d407aa affected
2abd839aa7e615f2bbc50c8ba7deb9e40d186768< a04de4c40aab9b338dfa989cf4aec70fd187eeb2 affected
2abd839aa7e615f2bbc50c8ba7deb9e40d186768< f014c10d190b92aad366e56b445daffcd1c075e4 affected
2abd839aa7e615f2bbc50c8ba7deb9e40d186768< e21a3ddd58733ce31afcb1e5dc3cb80a4b5bc29b affected
2abd839aa7e615f2bbc50c8ba7deb9e40d186768< 8d2d22a55ffe35c38e69795468a7addd1a80e9ce affected
2abd839aa7e615f2bbc50c8ba7deb9e40d186768< 926092268efdf1ed7b55cf486356c74a9e7710d1 affected
2abd839aa7e615f2bbc50c8ba7deb9e40d186768< 9b80430c194e4a114dc663c1025d56b4f3d0153d affected
… +12 more rows
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I. Basic Information for CVE-2025-39737

Vulnerability Information
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Vulnerability Title
mm/kmemleak: avoid soft lockup in __kmemleak_do_cleanup()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mm/kmemleak: avoid soft lockup in __kmemleak_do_cleanup() A soft lockup warning was observed on a relative small system x86-64 system with 16 GB of memory when running a debug kernel with kmemleak enabled. watchdog: BUG: soft lockup - CPU#8 stuck for 33s! [kworker/8:1:134] The test system was running a workload with hot unplug happening in parallel. Then kemleak decided to disable itself due to its inability to allocate more kmemleak objects. The debug kernel has its CONFIG_DEBUG_KMEMLEAK_MEM_POOL_SIZE set to 40,000. The soft lockup happened in kmemleak_do_cleanup() when the existing kmemleak objects were being removed and deleted one-by-one in a loop via a workqueue. In this particular case, there are at least 40,000 objects that need to be processed and given the slowness of a debug kernel and the fact that a raw_spinlock has to be acquired and released in __delete_object(), it could take a while to properly handle all these objects. As kmemleak has been disabled in this case, the object removal and deletion process can be further optimized as locking isn't really needed. However, it is probably not worth the effort to optimize for such an edge case that should rarely happen. So the simple solution is to call cond_resched() at periodic interval in the iteration loop to avoid soft lockup.
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__kmemleak_do_cleanup函数处理大量kmemleak对象时可能导致软锁定。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 ~ 9f1f4e95031f84867c5821540466d62f88dab8ca -
Linux Linux 5.4 -

II. Public POCs for CVE-2025-39737

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III. Intelligence Information for CVE-2025-39737

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Same Patch Batch · Linux · 2025-09-11 · 54 CVEs total

CVE-2025-39758 9.8 CRITICAL RDMA/siw: Fix the sendmsg byte count in siw_tcp_sendpages
CVE-2025-39761 8.8 HIGH wifi: ath12k: Decrement TID on RX peer frag setup error handling
CVE-2025-39750 8.8 HIGH wifi: ath12k: Correct tid cleanup when tid setup fails
CVE-2025-39790 8.4 HIGH bus: mhi: host: Detect events pointing to unexpected TREs
CVE-2025-39740 7.8 HIGH drm/xe/migrate: prevent potential UAF
CVE-2025-39779 7.8 HIGH btrfs: subpage: keep TOWRITE tag until folio is cleaned
CVE-2025-39780 7.8 HIGH sched/ext: Fix invalid task state transitions on class switch
CVE-2025-39791 7.8 HIGH dm: dm-crypt: Do not partially accept write BIOs with zoned targets
CVE-2025-39785 7.8 HIGH drm/hisilicon/hibmc: fix irq_request()'s irq name variable is local
CVE-2025-39787 7.8 HIGH soc: qcom: mdt_loader: Ensure we don't read past the ELF header
CVE-2025-39786 7.8 HIGH iio: adc: ad7173: fix channels index for syscalib_mode
CVE-2025-39770 7.5 HIGH net: gso: Forbid IPv6 TSO with extensions on devices with only IPV6_CSUM
CVE-2025-39738 7.3 HIGH btrfs: do not allow relocation of partially dropped subvolumes
CVE-2025-39789 7.3 HIGH crypto: x86/aegis - Add missing error checks
CVE-2025-39776 7.0 HIGH mm/debug_vm_pgtable: clear page table entries at destroy_args()
CVE-2025-39773 net: bridge: fix soft lockup in br_multicast_query_expired()
CVE-2025-39772 drm/hisilicon/hibmc: fix the hibmc loaded failed bug
CVE-2025-39771 regulator: pca9450: Use devm_register_sys_off_handler
CVE-2025-39768 net/mlx5: HWS, fix complex rules rehash error flow
CVE-2025-39769 bnxt_en: Fix lockdep warning during rmmod

Showing top 20 of 54 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39737

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