CVE-2026-23255

Enriched by CISA
 

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.
https://nvd.nist.gov/vuln/detail/CVE-2026-23255

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References


 

AFFECTED (from MITRE)

Vendor Product Versions
Linux Linux
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 589a530ae44d0c80f523fcfd1a15af8087f27d35 [affected]
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f613e8b4afea0cd17c7168e8b00e25bc8d33175d [affected]
Linux Linux
  • 2.6.12 [affected]
  • < 2.6.12 [unaffected]
  • 6.18.10 ≤ 6.18.* [unaffected]
  • 6.19 ≤ * [unaffected]
© 2022 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation.

CPE

cpe start end
Configuration 1
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 2.6.12 < 6.18.10
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 2.6.12 < 6.19

REMEDIATION


EXPLOITS

Exploit-db.com

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POC Github

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Other Nist (github, ...)

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CAPEC

Common Attack Pattern Enumerations and Classifications

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