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CVE-2025-38732— netfilter: nf_reject: don't leak dst refcount for loopback packets

EPSS 0.02% · P5
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I. Basic Information for CVE-2025-38732

Vulnerability Information
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Vulnerability Title
netfilter: nf_reject: don't leak dst refcount for loopback packets
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_reject: don't leak dst refcount for loopback packets recent patches to add a WARN() when replacing skb dst entry found an old bug: WARNING: include/linux/skbuff.h:1165 skb_dst_check_unset include/linux/skbuff.h:1164 [inline] WARNING: include/linux/skbuff.h:1165 skb_dst_set include/linux/skbuff.h:1210 [inline] WARNING: include/linux/skbuff.h:1165 nf_reject_fill_skb_dst+0x2a4/0x330 net/ipv4/netfilter/nf_reject_ipv4.c:234 [..] Call Trace: nf_send_unreach+0x17b/0x6e0 net/ipv4/netfilter/nf_reject_ipv4.c:325 nft_reject_inet_eval+0x4bc/0x690 net/netfilter/nft_reject_inet.c:27 expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline] .. This is because blamed commit forgot about loopback packets. Such packets already have a dst_entry attached, even at PRE_ROUTING stage. Instead of checking hook just check if the skb already has a route attached to it.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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nf_reject未正确处理环回数据包导致dst引用计数泄漏。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux f53b9b0bdc59c0823679f2e3214e0d538f5951b9 ~ 7b8b503c06274ef3c6c1a107743f1ec0d0a53ef8 -
LinuxLinux 5.9 -

II. Public POCs for CVE-2025-38732

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III. Intelligence Information for CVE-2025-38732

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Same Patch Batch · Linux · 2025-09-05 · 60 CVEs total

CVE-2025-39707drm/amdgpu: check if hubbub is NULL in debugfs/amdgpu_dm_capabilities
CVE-2025-39725mm/vmscan: fix hwpoisoned large folio handling in shrink_folio_list
CVE-2025-39722crypto: caam - Prevent crash on suspend with iMX8QM / iMX8ULP
CVE-2025-39721crypto: qat - flush misc workqueue during device shutdown
CVE-2025-39720ksmbd: fix refcount leak causing resource not released
CVE-2025-39723netfs: Fix unbuffered write error handling
CVE-2025-39711media: ivsc: Fix crash at shutdown due to missing mei_cldev_disable() calls
CVE-2025-39710media: venus: Add a check for packet size after reading from shared memory
CVE-2025-39709media: venus: protect against spurious interrupts during probe
CVE-2025-39708media: iris: Fix NULL pointer dereference
CVE-2025-39712media: mt9m114: Fix deadlock in get_frame_interval/set_frame_interval
CVE-2025-39706drm/amdkfd: Destroy KFD debugfs after destroy KFD wq
CVE-2025-39705drm/amd/display: fix a Null pointer dereference vulnerability
CVE-2025-39704LoongArch: KVM: Fix stack protector issue in send_ipi_data()
CVE-2025-39703net, hsr: reject HSR frame if skb can't hold tag
CVE-2025-39702ipv6: sr: Fix MAC comparison to be constant-time
CVE-2025-39701ACPI: pfr_update: Fix the driver update version check
CVE-2025-39700mm/damon/ops-common: ignore migration request to invalid nodes
CVE-2025-39699iommu/riscv: prevent NULL deref in iova_to_phys
CVE-2025-39698io_uring/futex: ensure io_futex_wait() cleans up properly on failure

Showing top 20 of 60 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-38732

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