Linux: Out-of-bounds Read
CVE-2023-52766 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 d23ad76f240c0f597b7a9eb79905d246f27d40df, 8be39f66915b40d26ea2c18ba84b5c3d5da6809b, 7c2b91b30d74d7c407118ad72502d4ca28af1af6 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 0.25% 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 d23ad76f240c0f597b7a9eb79905d246f27d40df or 8be39f66915b40d26ea2c18ba84b5c3d5da6809b or 7c2b91b30d74d7c407118ad72502d4ca28af1af6 or 4c86cb2321bd9c72d3b945ce7f747961beda8e65, whichever matches your release line, or a later version.
- Update Linux Kernel to 5.15.140 or 6.1.64 or 6.5.13 or 6.6.3, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 up to, but not including, d23ad76f240c0f597b7a9eb79905d246f27d40df; 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 up to, but not including, 8be39f66915b40d26ea2c18ba84b5c3d5da6809b; 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 up to, but not including, 7c2b91b30d74d7c407118ad72502d4ca28af1af6; 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 up to, but not including, 4c86cb2321bd9c72d3b945ce7f747961beda8e65; 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 up to, but not including, 45a832f989e520095429589d5b01b0c65da9b574; 5.0 | d23ad76f240c0f597b7a9eb79905d246f27d40df, 8be39f66915b40d26ea2c18ba84b5c3d5da6809b, 7c2b91b30d74d7c407118ad72502d4ca28af1af6, 4c86cb2321bd9c72d3b945ce7f747961beda8e65, 45a832f989e520095429589d5b01b0c65da9b574 |
| Linux | Linux Kernel | before 5.15.140; 5.16 up to, but not including, 6.1.64; 6.2 up to, but not including, 6.5.13; 6.6 up to, but not including, 6.6.3 | 5.15.140, 6.1.64, 6.5.13, 6.6.3 |
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: i3c: mipi-i3c-hci: Fix out of bounds access in hci_dma_irq_handler Do not loop over ring headers in hci_dma_irq_handler() that are not allocated and enabled in hci_dma_init(). Otherwise out of bounds access will occur from rings->headers[i] access when i >= number of allocated ring headers.
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/45a832f989e520095429589d5b01b0c65da9b574
- git.kernel.org/stable/c/4c86cb2321bd9c72d3b945ce7f747961beda8e65
- git.kernel.org/stable/c/7c2b91b30d74d7c407118ad72502d4ca28af1af6
- git.kernel.org/stable/c/8be39f66915b40d26ea2c18ba84b5c3d5da6809b
- git.kernel.org/stable/c/d23ad76f240c0f597b7a9eb79905d246f27d40df
Recent Out-of-bounds Read vulnerabilities
- 7.8 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.8 High severity
- 7.1 High severity
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