Linux: Out-of-bounds Read
CVE-2025-38715 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions e7d2dc2421e821e4045775e6dc226378328de6f6, 67ecc81f6492275c9c54280532f558483c99c90e, a1a60e79502279f996e55052f50cc14919020475 as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.18% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Linux to e7d2dc2421e821e4045775e6dc226378328de6f6 or 67ecc81f6492275c9c54280532f558483c99c90e or a1a60e79502279f996e55052f50cc14919020475 or fe2891a9c43ab87d1a210d61e6438ca6936e2f62, whichever matches your release line, or a later version.
- Update SIMATIC CN 4100 to V5.0 or a later version.
- Update Linux Kernel to 5.4.297 or 5.10.241 or 5.15.190 or 6.1.149, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, e7d2dc2421e821e4045775e6dc226378328de6f6; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 67ecc81f6492275c9c54280532f558483c99c90e; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, a1a60e79502279f996e55052f50cc14919020475; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, fe2891a9c43ab87d1a210d61e6438ca6936e2f62; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 384a66b89f9540a9a8cb0f48807697dfabaece4c; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, efc095b35b23297e419c2ab4fc1ed1a8f0781a29; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, fc7f732984ec91f30be3e574e0644066d07f2b78; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, eec522fd0d28106b14a59ab2d658605febe4a3bb; and 2 more ranges | e7d2dc2421e821e4045775e6dc226378328de6f6, 67ecc81f6492275c9c54280532f558483c99c90e, a1a60e79502279f996e55052f50cc14919020475, fe2891a9c43ab87d1a210d61e6438ca6936e2f62, 384a66b89f9540a9a8cb0f48807697dfabaece4c, efc095b35b23297e419c2ab4fc1ed1a8f0781a29 |
| Siemens | SIMATIC CN 4100 | before V5.0 | V5.0 |
| Linux | Linux Kernel | 2.6.12.1 up to, but not including, 5.4.297; 5.5 up to, but not including, 5.10.241; 5.11 up to, but not including, 5.15.190; 5.16 up to, but not including, 6.1.149; 6.2 up to, but not including, 6.6.103; 6.7 up to, but not including, 6.12.43; 6.13 up to, but not including, 6.15.11; 6.16 up to, but not including, 6.16.2; and 1 more ranges | 5.4.297, 5.10.241, 5.15.190, 6.1.149, 6.6.103, 6.12.43 |
| Debian | Debian Linux | 11.0 | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.8 | High | CNA |
| CVSS 3.1 | 7.1 | High | NVD |
Official description
In the Linux kernel, the following vulnerability has been resolved: hfs: fix slab-out-of-bounds in hfs_bnode_read() This patch introduces is_bnode_offset_valid() method that checks the requested offset value. Also, it introduces check_and_correct_requested_length() method that checks and correct the requested length (if it is necessary). These methods are used in hfs_bnode_read(), hfs_bnode_write(), hfs_bnode_clear(), hfs_bnode_copy(), and hfs_bnode_move() with the goal to prevent the access out of allocated memory and triggering the crash.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that provides appropriate memory abstractions.
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- git.kernel.org/stable/c/384a66b89f9540a9a8cb0f48807697dfabaece4c
- git.kernel.org/stable/c/67ecc81f6492275c9c54280532f558483c99c90e
- git.kernel.org/stable/c/a1a60e79502279f996e55052f50cc14919020475
- git.kernel.org/stable/c/a431930c9bac518bf99d6b1da526a7f37ddee8d8
- git.kernel.org/stable/c/e7d2dc2421e821e4045775e6dc226378328de6f6
- git.kernel.org/stable/c/eec522fd0d28106b14a59ab2d658605febe4a3bb
- git.kernel.org/stable/c/efc095b35b23297e419c2ab4fc1ed1a8f0781a29
- git.kernel.org/stable/c/fc7f732984ec91f30be3e574e0644066d07f2b78
- git.kernel.org/stable/c/fe2891a9c43ab87d1a210d61e6438ca6936e2f62
Third-party and government advisories
- lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlMailing List, Third Party Advisory
- lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlMailing List, Third Party Advisory
Other references
Recent Out-of-bounds Read vulnerabilities
- 8.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
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