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CVE-2025-39673— ppp: fix race conditions in ppp_fill_forward_path

EPSS 0.01% · P2
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I. Basic Information for CVE-2025-39673

Vulnerability Information
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Vulnerability Title
ppp: fix race conditions in ppp_fill_forward_path
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ppp: fix race conditions in ppp_fill_forward_path ppp_fill_forward_path() has two race conditions: 1. The ppp->channels list can change between list_empty() and list_first_entry(), as ppp_lock() is not held. If the only channel is deleted in ppp_disconnect_channel(), list_first_entry() may access an empty head or a freed entry, and trigger a panic. 2. pch->chan can be NULL. When ppp_unregister_channel() is called, pch->chan is set to NULL before pch is removed from ppp->channels. Fix these by using a lockless RCU approach: - Use list_first_or_null_rcu() to safely test and access the first list entry. - Convert list modifications on ppp->channels to their RCU variants and add synchronize_net() after removal. - Check for a NULL pch->chan before dereferencing 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ppp_fill_forward_path中存在竞争条件。
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 f6efc675c9dd8d93f826b79ae7e33e03301db609 ~ 9a1969fbffc1f1900d92d7594b1b7d8d72ef3dc7 -
LinuxLinux 5.13 -

II. Public POCs for CVE-2025-39673

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III. Intelligence Information for CVE-2025-39673

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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

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