Ubuntu Linux: Out-of-bounds Read
CVE-2026-47333 is a high-severity out-of-bounds read vulnerability in Ubuntu Linux from Canonical, with a CVSS 3.1 base score of 7.8 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 6.8.0-124.124, 6.17.0-35.35, 7.0.0-22.22 as the first without the flaw, so updating Ubuntu Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.11% 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 Ubuntu Linux to 6.8.0-124.124 or 6.17.0-35.35 or 7.0.0-22.22, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Canonical | Ubuntu Linux | 6.8.0 up to, but not including, 6.8.0-124.124; 6.17.0 up to, but not including, 6.17.0-35.35; 7.0.0 up to, but not including, 7.0.0-22.22 | 6.8.0-124.124, 6.17.0-35.35, 7.0.0-22.22 |
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
- HighData or code can be modified at will.
- 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:H/A:H. Scored by CNA (ubuntu.com).
Official description
Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the size of an internal buffer, leading to a heap memory out-of-bounds read in notification handling code. The bug can be triggered by an unprivileged local user and can result in invalid data being processed by the AppArmor DFA policy engine.
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: total).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
Other vulnerabilities in Ubuntu Linux
- 7.8 High severity
- 7.8 High severity
- 7.5 High severity
- 7.1 High severity
- 7.8 High severity
- 8.1 High severity
Recent Out-of-bounds Read vulnerabilities
- 8.3 High severity
- 8.8 High severity
- 8.8 High severity
- 8.3 High severity
- 8.3 High severity
- 9.6 Critical severity
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