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CVE-2026-23255— net: add proper RCU protection to /proc/net/ptype

EPSS 0.03% · P7
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I. Basic Information for CVE-2026-23255

Vulnerability Information
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Vulnerability Title
net: add proper RCU protection to /proc/net/ptype
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: add proper RCU protection to /proc/net/ptype Yin Fengwei reported an RCU stall in ptype_seq_show() and provided a patch. Real issue is that ptype_seq_next() and ptype_seq_show() violate RCU rules. ptype_seq_show() runs under rcu_read_lock(), and reads pt->dev to get device name without any barrier. At the same time, concurrent writers can remove a packet_type structure (which is correctly freed after an RCU grace period) and clear pt->dev without an RCU grace period. Define ptype_iter_state to carry a dev pointer along seq_net_private: struct ptype_iter_state { struct seq_net_private p; struct net_device *dev; // added in this patch }; We need to record the device pointer in ptype_get_idx() and ptype_seq_next() so that ptype_seq_show() is safe against concurrent pt->dev changes. We also need to add full RCU protection in ptype_seq_next(). (Missing READ_ONCE() when reading list.next values) Many thanks to Dong Chenchen for providing a repro.
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/proc/net/ptype缺少适当的RCU保护，可能导致读取过时的设备指针。
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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 002a73470b56848e4c81efeaaedd471e92d66d8d -
LinuxLinux 2.6.12 -

II. Public POCs for CVE-2026-23255

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III. Intelligence Information for CVE-2026-23255

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Same Patch Batch · Linux · 2026-03-18 · 35 CVEs total

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CVE-2026-232457.8 HIGHnet/sched: act_gate: snapshot parameters with RCU on replace
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CVE-2026-23250xfs: check return value of xchk_scrub_create_subord
CVE-2026-23251xfs: only call xf{array,blob}_destroy if we have a valid pointer
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CVE-2025-71265fs: ntfs3: fix infinite loop in attr_load_runs_range on inconsistent metadata
CVE-2025-71268btrfs: fix reservation leak in some error paths when inserting inline extent
CVE-2025-71269btrfs: do not free data reservation in fallback from inline due to -ENOSPC

Showing top 20 of 35 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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