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CVE-2025-39736— mm/kmemleak: avoid deadlock by moving pr_warn() outside kmemleak_lock

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_lock锁定期间调用pr_warn_once可能导致死锁，可能造成系统锁定。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux c5665868183fec689dbab9fb8505188b2c4f0757< c7b6ea0ede687e7460e593c5ea478f50aa41682a affected
c5665868183fec689dbab9fb8505188b2c4f0757< 4b0151e1d468eb2667c37b7af99b3c075072d334 affected
c5665868183fec689dbab9fb8505188b2c4f0757< f249d32bb54876b4b6c3ae071af8ddca77af390b affected
c5665868183fec689dbab9fb8505188b2c4f0757< 62879faa8efe8d8a9c7bf7606ee9c068012d7dac affected
c5665868183fec689dbab9fb8505188b2c4f0757< 1da95d3d4b7b1d380ebd87b71a61e7e6aed3265d affected
c5665868183fec689dbab9fb8505188b2c4f0757< a0854de00ce2ee27edf39037e7836ad580eb3350 affected
c5665868183fec689dbab9fb8505188b2c4f0757< 08f70be5e406ce47c822f2dd11c1170ca259605b affected
c5665868183fec689dbab9fb8505188b2c4f0757< a181b228b37a6a5625dad2bb4265bb7abb673e9f affected
… +12 more rows
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I. Basic Information for CVE-2025-39736

Vulnerability Information
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Vulnerability Title
mm/kmemleak: avoid deadlock by moving pr_warn() outside kmemleak_lock
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mm/kmemleak: avoid deadlock by moving pr_warn() outside kmemleak_lock When netpoll is enabled, calling pr_warn_once() while holding kmemleak_lock in mem_pool_alloc() can cause a deadlock due to lock inversion with the netconsole subsystem. This occurs because pr_warn_once() may trigger netpoll, which eventually leads to __alloc_skb() and back into kmemleak code, attempting to reacquire kmemleak_lock. This is the path for the deadlock. mem_pool_alloc() -> raw_spin_lock_irqsave(&kmemleak_lock, flags); -> pr_warn_once() -> netconsole subsystem -> netpoll -> __alloc_skb -> __create_object -> raw_spin_lock_irqsave(&kmemleak_lock, flags); Fix this by setting a flag and issuing the pr_warn_once() after kmemleak_lock is released.
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_lock锁定期间调用pr_warn_once可能导致死锁，可能造成系统锁定。
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 c5665868183fec689dbab9fb8505188b2c4f0757 ~ c7b6ea0ede687e7460e593c5ea478f50aa41682a -
Linux Linux 5.4 -

II. Public POCs for CVE-2025-39736

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III. Intelligence Information for CVE-2025-39736

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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-2025-39750 8.8 HIGH wifi: ath12k: Correct tid cleanup when tid setup fails
CVE-2025-39761 8.8 HIGH wifi: ath12k: Decrement TID on RX peer frag setup error handling
CVE-2025-39790 8.4 HIGH bus: mhi: host: Detect events pointing to unexpected TREs
CVE-2025-39791 7.8 HIGH dm: dm-crypt: Do not partially accept write BIOs with zoned targets
CVE-2025-39787 7.8 HIGH soc: qcom: mdt_loader: Ensure we don't read past the ELF header
CVE-2025-39740 7.8 HIGH drm/xe/migrate: prevent potential UAF
CVE-2025-39786 7.8 HIGH iio: adc: ad7173: fix channels index for syscalib_mode
CVE-2025-39785 7.8 HIGH drm/hisilicon/hibmc: fix irq_request()'s irq name variable is local
CVE-2025-39780 7.8 HIGH sched/ext: Fix invalid task state transitions on class switch
CVE-2025-39779 7.8 HIGH btrfs: subpage: keep TOWRITE tag until folio is cleaned
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-2025-39744 rcu: Fix rcu_read_unlock() deadloop due to IRQ work
CVE-2025-39777 crypto: acomp - Fix CFI failure due to type punning
CVE-2025-39781 parisc: Drop WARN_ON_ONCE() from flush_cache_vmap
CVE-2025-39745 rcutorture: Fix rcutorture_one_extend_check() splat in RT kernels
CVE-2025-39783 PCI: endpoint: Fix configfs group list head handling

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-2025-39736

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