Linux: Out-of-bounds Read
CVE-2023-52794 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 6a3866dbdcf39ac93e98708e6abced511733dc18, 0a8585281b11e3a0723bba8d8085d61f0b55f37c, fae633cfb729da2771b5433f6b84ae7e8b4aa5f7 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 0.24% 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 6a3866dbdcf39ac93e98708e6abced511733dc18 or 0a8585281b11e3a0723bba8d8085d61f0b55f37c or fae633cfb729da2771b5433f6b84ae7e8b4aa5f7, whichever matches your release line, or a later version.
- Update Linux Kernel to 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 | ebf519710218814cf827adbf9111af081344c969 up to, but not including, 6a3866dbdcf39ac93e98708e6abced511733dc18; ebf519710218814cf827adbf9111af081344c969 up to, but not including, 0a8585281b11e3a0723bba8d8085d61f0b55f37c; ebf519710218814cf827adbf9111af081344c969 up to, but not including, fae633cfb729da2771b5433f6b84ae7e8b4aa5f7; 6.3 | 6a3866dbdcf39ac93e98708e6abced511733dc18, 0a8585281b11e3a0723bba8d8085d61f0b55f37c, fae633cfb729da2771b5433f6b84ae7e8b4aa5f7 |
| Linux | Linux Kernel | 6.3 up to, but not including, 6.5.13; 6.6 up to, but not including, 6.6.3 | 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.
Official description
In the Linux kernel, the following vulnerability has been resolved: thermal: intel: powerclamp: fix mismatch in get function for max_idle KASAN reported this [ 444.853098] BUG: KASAN: global-out-of-bounds in param_get_int+0x77/0x90 [ 444.853111] Read of size 4 at addr ffffffffc16c9220 by task cat/2105 ... [ 444.853442] The buggy address belongs to the variable: [ 444.853443] max_idle+0x0/0xffffffffffffcde0 [intel_powerclamp] There is a mismatch between the param_get_int and the definition of max_idle. Replacing param_get_int with param_get_byte resolves this issue.
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
- 7.8 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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