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CVE-2025-39764— netfilter: ctnetlink: remove refcounting in expectation dumpers

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ctnetlink中的期望转储器存在引用计数问题，可能导致内存泄漏。

AI Predicted 5.3 Difficulty: Theoretical EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux cf6994c2b9812a9f02b99e89df411ffc5db9c779< b05500444b8eb97644efdd180839a04a706be97c affected
cf6994c2b9812a9f02b99e89df411ffc5db9c779< bada48ad5b0590e318d0f79636ff62a2ef9f4955 affected
cf6994c2b9812a9f02b99e89df411ffc5db9c779< 64b7684042246e3238464c66894e30ba30c7e851 affected
cf6994c2b9812a9f02b99e89df411ffc5db9c779< 9e5021a906532ca16e2aac69c0607711e1c70b1f affected
cf6994c2b9812a9f02b99e89df411ffc5db9c779< 078d33c95bf534d37aa04269d1ae6158e20082d5 affected
cf6994c2b9812a9f02b99e89df411ffc5db9c779< a4d634ded4d3d400f115d84f654f316f249531c9 affected
cf6994c2b9812a9f02b99e89df411ffc5db9c779< 1492e3dcb2be3aa46d1963da96aa9593e4e4db5a affected
2.6.23 affected
… +8 more rows
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I. Basic Information for CVE-2025-39764

Vulnerability Information
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Vulnerability Title
netfilter: ctnetlink: remove refcounting in expectation dumpers
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: remove refcounting in expectation dumpers Same pattern as previous patch: do not keep the expectation object alive via refcount, only store a cookie value and then use that as the skip hint for dump resumption. AFAICS this has the same issue as the one resolved in the conntrack dumper, when we do if (!refcount_inc_not_zero(&exp->use)) to increment the refcount, there is a chance that exp == last, which causes a double-increment of the refcount and subsequent memory leak.
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ctnetlink中的期望转储器存在引用计数问题，可能导致内存泄漏。
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 cf6994c2b9812a9f02b99e89df411ffc5db9c779 ~ b05500444b8eb97644efdd180839a04a706be97c -
Linux Linux 2.6.23 -

II. Public POCs for CVE-2025-39764

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III. Intelligence Information for CVE-2025-39764

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Patches & Fixes for CVE-2025-39764 (3)

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-2025-39779 7.8 HIGH btrfs: subpage: keep TOWRITE tag until folio is cleaned
CVE-2025-39785 7.8 HIGH drm/hisilicon/hibmc: fix irq_request()'s irq name variable is local
CVE-2025-39786 7.8 HIGH iio: adc: ad7173: fix channels index for syscalib_mode
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-2025-39780 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-2025-39770 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-2025-39784 PCI: Fix link speed calculation on retrain failure
CVE-2025-39772 drm/hisilicon/hibmc: fix the hibmc loaded failed bug
CVE-2025-39782 jbd2: prevent softlockup in jbd2_log_do_checkpoint()
CVE-2025-39771 regulator: pca9450: Use devm_register_sys_off_handler
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-2025-39764

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