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Review reviewHigh

CVE-2025-40271

Linux Linux, RUGGEDCOM RST2428P

In the Linux kernel, the following vulnerability has been resolved: fs/proc: fix uaf in proc_readdir_de() Pde is erased from subdir rbtree through rb_erase(), but not set the node to EMPTY, which may result in uaf access. We should use RB_CLEAR_NODE() set the erased node to EMPTY, then pde_subdir_next() will return NULL to avoid uaf access. We found an uaf issue while using stress-ng testing, need to run testcase getdent and tun in the same time. The steps of the issue is as follows: 1) use getdent to traverse dir /proc/pid/net/dev_snmp6/, and current pde is tun3; 2) in the [time windows] u...

CVSS
7.8
EPSS
0.45%
36.5% percentile
CISA KEV
Not listed
Published
2025.12.07
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.45%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: fs/proc: fix uaf in proc_readdir_de() Pde is erased from subdir rbtree through rb_erase(), but not set the node to EMPTY, which may result in uaf access. We should use RB_CLEAR_NODE() set the erased node to EMPTY, then pde_subdir_next() will return NULL to avoid uaf access. We found an uaf issue while using stress-ng testing, need to run testcase getdent and tun in the same time. The steps of the issue is as follows: 1) use getdent to traverse dir /proc/pid/net/dev_snmp6/, and current pde is tun3; 2) in the [time windows] u...

Affected product and versions

Product
Linux Linux, RUGGEDCOM RST2428P
Affected versions
>= 710585d4922fd315f2cada8fbe550ae8ed23e994 < 1d1596d68a6f11d28f677eedf6cf5b17dbfeb491, >= 710585d4922fd315f2cada8fbe550ae8ed23e994 < c81d0385500446efe48c305bbb83d47f2ae23a50, >= 710585d4922fd315f2cada8fbe550ae8ed23e994 < 4cba73c4c89219beef7685a47374bf88b1022369, >= 710585d4922fd315f2cada8fbe550ae8ed23e994 < 6f2482745e510ae1dacc9b090194b9c5f918d774, >= 710585d4922fd315f2cada8fbe550ae8ed23e994 < 67272c11f379d9aa5e0f6b16286b9d89b3f76046, >= 710585d4922fd315f2cada8fbe550ae8ed23e994 < 623bb26127fb581a741e880e1e1a47d79aecb6f8, >= 710585d4922fd315f2cada8fbe550ae8ed23e994 < 03de7ff197a3d0e17d0d5c58fdac99a63cba8110, >= 710585d4922fd315f2cada8fbe550ae8ed23e994 < 895b4c0c79b092d732544011c3cecaf7322c36a1, >= 3.19, < V4.0
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, RUGGEDCOM RST2428P and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available
CVE-2025-40271 — Linux Linux, RUGGEDCOM RST2428P | SECUFOCUS NOW