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CVE-2025-71146— netfilter: nf_conncount: fix leaked ct in error paths

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，该漏洞源于错误路径中连接跟踪泄漏，可能导致引用计数问题。

CVSS 7.5 · High EPSS 0.29% · P20

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 11

VendorProduct Version RangeStatus
Linux Linux 6e86f0eca857ee42787e30e9ec0b726aebfcae0a< 08fa37f4c8c59c294e9c18fea2d083ee94074e5a affected
b160895d6bc9690459b16ef87799c9bd456af3ec< e1ac8dce3a893641bef224ad057932f142b8a36f affected
8d5a2c94c24dcc226863a7c2b5034750370c2189< f381a33f34dda9e4023e38ba68c943bca83245e9 affected
da9f247fb5efcd5a2730cdc989291b383c439e10< 325eb61bb30790ea27782203a17b007ce1754a67 affected
3558faee8aace3541189c3a2ca45c7e85e144b44< 0b88be7211d21a0d68bb1e56dc805944e3654d6f affected
f6904ed15ed1a188543057e3cb0d02daa80edfc9< 4bd2b89f4028f250dd1c1625eb3da1979b04a5e8 affected
be102eb6a0e7c03db00e50540622f4e43b2d2844< 2e2a720766886190a6d35c116794693aabd332b6 affected
8c2da7330214ce30f8333d1799a27ed0a9418f07 affected
… +3 more rows
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I. Basic Information for CVE-2025-71146

Vulnerability Information
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Vulnerability Title
netfilter: nf_conncount: fix leaked ct in error paths
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conncount: fix leaked ct in error paths There are some situations where ct might be leaked as error paths are skipping the refcounted check and return immediately. In order to solve it make sure that the check is always called.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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，该漏洞源于错误路径中连接跟踪泄漏，可能导致引用计数问题。
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 6e86f0eca857ee42787e30e9ec0b726aebfcae0a ~ 08fa37f4c8c59c294e9c18fea2d083ee94074e5a -
Linux Linux 6.12.63 ~ 6.12.64 -

II. Public POCs for CVE-2025-71146

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III. Intelligence Information for CVE-2025-71146

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Same Patch Batch · Linux · 2026-01-23 · 34 CVEs total

CVE-2026-22984 9.8 CRITICAL libceph: prevent potential out-of-bounds reads in handle_auth_done()
CVE-2025-71159 9.8 CRITICAL btrfs: fix use-after-free warning in btrfs_get_or_create_delayed_node()
CVE-2026-22988 7.8 HIGH arp: do not assume dev_hard_header() does not change skb->head
CVE-2026-22980 7.8 HIGH nfsd: provide locking for v4_end_grace
CVE-2025-71145 7.8 HIGH usb: phy: isp1301: fix non-OF device reference imbalance
CVE-2025-71158 7.8 HIGH gpio: mpsse: ensure worker is torn down
CVE-2025-71155 7.8 HIGH KVM: s390: Fix gmap_helper_zap_one_page() again
CVE-2026-22990 7.5 HIGH libceph: replace overzealous BUG_ON in osdmap_apply_incremental()
CVE-2026-22991 7.5 HIGH libceph: make free_choose_arg_map() resilient to partial allocation
CVE-2026-22992 7.5 HIGH libceph: return the handler error from mon_handle_auth_done()
CVE-2025-71161 7.5 HIGH dm-verity: disable recursive forward error correction
CVE-2025-71150 7.5 HIGH ksmbd: Fix refcount leak when invalid session is found on session lookup
CVE-2026-22989 nfsd: check that server is running in unlock_filesystem
CVE-2026-22979 net: fix memory leak in skb_segment_list for GRO packets
CVE-2026-22993 idpf: Fix RSS LUT NULL ptr issue after soft reset
CVE-2026-22987 net/sched: act_api: avoid dereferencing ERR_PTR in tcf_idrinfo_destroy
CVE-2026-22986 gpiolib: fix race condition for gdev->srcu
CVE-2026-22994 bpf: Fix reference count leak in bpf_prog_test_run_xdp()
CVE-2026-22985 idpf: Fix RSS LUT NULL pointer crash on early ethtool operations
CVE-2026-22995 ublk: fix use-after-free in ublk_partition_scan_work

Showing top 20 of 34 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-71146

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