Linux: Out-of-bounds Read
CVE-2026-23318 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 82a7d0a1b88798de1a609130080ce0c65dd869e9, 8307d93e63d5f54ef10412d4db2dd551e920dee4, 0dcd1ed96c03459cf14706885c9dd3c1fd8bd29f 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 0.14% 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 82a7d0a1b88798de1a609130080ce0c65dd869e9 or 8307d93e63d5f54ef10412d4db2dd551e920dee4 or 0dcd1ed96c03459cf14706885c9dd3c1fd8bd29f or a0c6ae2ea84528f198bf7fd0117f12fd0cf6d7cc, whichever matches your release line, or a later version.
- Update Linux Kernel to 4.20 or 5.4 or 5.10.253 or 5.15.203, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 57f8770620e9b51c61089751f0b5ad3dbe376ff2 up to, but not including, 82a7d0a1b88798de1a609130080ce0c65dd869e9; 57f8770620e9b51c61089751f0b5ad3dbe376ff2 up to, but not including, 8307d93e63d5f54ef10412d4db2dd551e920dee4; 57f8770620e9b51c61089751f0b5ad3dbe376ff2 up to, but not including, 0dcd1ed96c03459cf14706885c9dd3c1fd8bd29f; 57f8770620e9b51c61089751f0b5ad3dbe376ff2 up to, but not including, a0c6ae2ea84528f198bf7fd0117f12fd0cf6d7cc; 57f8770620e9b51c61089751f0b5ad3dbe376ff2 up to, but not including, d3904ca40515272681ae61ad6f561c24f190957f; 57f8770620e9b51c61089751f0b5ad3dbe376ff2 up to, but not including, 1e5753ff4c2e86aa88516f97a224c90a3d0b133e; 57f8770620e9b51c61089751f0b5ad3dbe376ff2 up to, but not including, 499ffd15b00dc91ac95c28f76959dfb5cdcc84d5; 57f8770620e9b51c61089751f0b5ad3dbe376ff2 up to, but not including, 54f9d645a5453d0bfece0c465d34aaf072ea99fa; and 5 more ranges | 82a7d0a1b88798de1a609130080ce0c65dd869e9, 8307d93e63d5f54ef10412d4db2dd551e920dee4, 0dcd1ed96c03459cf14706885c9dd3c1fd8bd29f, a0c6ae2ea84528f198bf7fd0117f12fd0cf6d7cc, d3904ca40515272681ae61ad6f561c24f190957f, 1e5753ff4c2e86aa88516f97a224c90a3d0b133e |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem | all versions | Not stated |
| Linux | Linux Kernel | 4.19.84 up to, but not including, 4.20; 5.3.11 up to, but not including, 5.4; 5.4.1 up to, but not including, 5.10.253; 5.11 up to, but not including, 5.15.203; 5.16 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; and 3 more ranges | 4.20, 5.4, 5.10.253, 5.15.203, 6.1.167, 6.6.130 |
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: ALSA: usb-audio: Use correct version for UAC3 header validation The entry of the validators table for UAC3 AC header descriptor is defined with the wrong protocol version UAC_VERSION_2, while it should have been UAC_VERSION_3. This results in the validator never matching for actual UAC3 devices (protocol == UAC_VERSION_3), causing their header descriptors to bypass validation entirely. A malicious USB device presenting a truncated UAC3 header could exploit this to cause out-of-bounds reads when the driver later accesses unvalidated descriptor fields. The bug was introduced in the same commit as the recently fixed UAC3 feature unit sub-type typo, and appears to be from the same copy-paste error when the UAC3 section was created from the UAC2 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
- git.kernel.org/stable/c/0dcd1ed96c03459cf14706885c9dd3c1fd8bd29f
- git.kernel.org/stable/c/1e5753ff4c2e86aa88516f97a224c90a3d0b133e
- git.kernel.org/stable/c/499ffd15b00dc91ac95c28f76959dfb5cdcc84d5
- git.kernel.org/stable/c/54f9d645a5453d0bfece0c465d34aaf072ea99fa
- git.kernel.org/stable/c/82a7d0a1b88798de1a609130080ce0c65dd869e9
- git.kernel.org/stable/c/8307d93e63d5f54ef10412d4db2dd551e920dee4
- git.kernel.org/stable/c/a0c6ae2ea84528f198bf7fd0117f12fd0cf6d7cc
- git.kernel.org/stable/c/d3904ca40515272681ae61ad6f561c24f190957f
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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