Linux: Out-of-bounds Read
CVE-2025-39778 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 1adc93a525fdee8e2b311e6d5fd93eb69714ca05, 8fbf37a3577b4d64c150cafde338eee17b2f2ea4, 0cc0efc58d6c741b2868d4af24874d7fec28a575 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 0.26% 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 1adc93a525fdee8e2b311e6d5fd93eb69714ca05 or 8fbf37a3577b4d64c150cafde338eee17b2f2ea4 or 0cc0efc58d6c741b2868d4af24874d7fec28a575 or 107a23185d990e3df6638d9a84c835f963fe30a6, whichever matches your release line, or a later version.
- Update Linux Kernel to 6.12.23 or 6.13.11 or 6.14.2, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 649fd41420a816b11b07423ebf4dbd4ac1ac2905 up to, but not including, 1adc93a525fdee8e2b311e6d5fd93eb69714ca05; 649fd41420a816b11b07423ebf4dbd4ac1ac2905 up to, but not including, 8fbf37a3577b4d64c150cafde338eee17b2f2ea4; 649fd41420a816b11b07423ebf4dbd4ac1ac2905 up to, but not including, 0cc0efc58d6c741b2868d4af24874d7fec28a575; 649fd41420a816b11b07423ebf4dbd4ac1ac2905 up to, but not including, 107a23185d990e3df6638d9a84c835f963fe30a6; 6.11 | 1adc93a525fdee8e2b311e6d5fd93eb69714ca05, 8fbf37a3577b4d64c150cafde338eee17b2f2ea4, 0cc0efc58d6c741b2868d4af24874d7fec28a575, 107a23185d990e3df6638d9a84c835f963fe30a6 |
| Linux | Linux Kernel | 6.11 up to, but not including, 6.12.23; 6.13 up to, but not including, 6.13.11; 6.14 up to, but not including, 6.14.2 | 6.12.23, 6.13.11, 6.14.2 |
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 | 7.1 | High | NVD |
| CVSS 3.1 | 7.1 | High | CISA (ADP) |
Official description
In the Linux kernel, the following vulnerability has been resolved: objtool, nvmet: Fix out-of-bounds stack access in nvmet_ctrl_state_show() The csts_state_names[] array only has six sparse entries, but the iteration code in nvmet_ctrl_state_show() iterates seven, resulting in a potential out-of-bounds stack read. Fix that. Fixes the following warning with an UBSAN kernel: vmlinux.o: warning: objtool: .text.nvmet_ctrl_state_show: unexpected end of section
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.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
Recent Out-of-bounds Read vulnerabilities
- 7.1 High severity
- 7.1 High severity
- 7.5 High severity
- 8.8 High severity
- 7.1 High severity
- 7.1 High severity
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