Linux: Out-of-bounds Read
CVE-2026-23315 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 84419556359bc96d3fe1623d47a64c86542566cc, 7ae7b093b7dba9548a3bc4766b9364b97db4732d, 7b692dff8df0ba5feb8df00f27d906d6eb1fe627 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 0.13% 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 84419556359bc96d3fe1623d47a64c86542566cc or 7ae7b093b7dba9548a3bc4766b9364b97db4732d or 7b692dff8df0ba5feb8df00f27d906d6eb1fe627 or 9612d91f617231e03c49cb9b0c02f975a3b4f51f, whichever matches your release line, or a later version.
- Update Linux Kernel to 6.1.167 or 6.6.130 or 6.12.77 or 6.18.17, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 577dbc6c656da6997dddc6cf842b7954588f2d4e up to, but not including, 84419556359bc96d3fe1623d47a64c86542566cc; 577dbc6c656da6997dddc6cf842b7954588f2d4e up to, but not including, 7ae7b093b7dba9548a3bc4766b9364b97db4732d; 577dbc6c656da6997dddc6cf842b7954588f2d4e up to, but not including, 7b692dff8df0ba5feb8df00f27d906d6eb1fe627; 577dbc6c656da6997dddc6cf842b7954588f2d4e up to, but not including, 9612d91f617231e03c49cb9b0c02f975a3b4f51f; 577dbc6c656da6997dddc6cf842b7954588f2d4e up to, but not including, 0fb3b94a9431a3800717e5c3b6fa2e1045a15029; 577dbc6c656da6997dddc6cf842b7954588f2d4e up to, but not including, 4e10a730d1b511ff49723371ed6d694dd1b2c785; 5.10 | 84419556359bc96d3fe1623d47a64c86542566cc, 7ae7b093b7dba9548a3bc4766b9364b97db4732d, 7b692dff8df0ba5feb8df00f27d906d6eb1fe627, 9612d91f617231e03c49cb9b0c02f975a3b4f51f, 0fb3b94a9431a3800717e5c3b6fa2e1045a15029, 4e10a730d1b511ff49723371ed6d694dd1b2c785 |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem | all versions | Not stated |
| Linux | Linux Kernel | 5.10.1 up to, but not including, 6.1.167; 6.2 up to, but not including, 6.6.130; 6.7 up to, but not including, 6.12.77; 6.13 up to, but not including, 6.18.17; 6.19 up to, but not including, 6.19.7; 5.10; 7.0 | 6.1.167, 6.6.130, 6.12.77, 6.18.17, 6.19.7 |
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.
Official description
In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: Fix possible oob access in mt76_connac2_mac_write_txwi_80211() Check frame length before accessing the mgmt fields in mt76_connac2_mac_write_txwi_80211 in order to avoid a possible oob access. [fix check to also cover mgmt->u.action.u.addba_req.capab, correct Fixes tag]
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
- git.kernel.org/stable/c/0fb3b94a9431a3800717e5c3b6fa2e1045a15029
- git.kernel.org/stable/c/4e10a730d1b511ff49723371ed6d694dd1b2c785
- git.kernel.org/stable/c/7ae7b093b7dba9548a3bc4766b9364b97db4732d
- git.kernel.org/stable/c/7b692dff8df0ba5feb8df00f27d906d6eb1fe627
- git.kernel.org/stable/c/84419556359bc96d3fe1623d47a64c86542566cc
- git.kernel.org/stable/c/9612d91f617231e03c49cb9b0c02f975a3b4f51f
Other references
Recent Out-of-bounds Read vulnerabilities
- 7.1 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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