Linux: Out-of-bounds Write
CVE-2023-53205 is a high-severity out-of-bounds write vulnerability in Linux, 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 a9ccf140a2a03a0ae82be4bdfbdd17bdaea72ff5, 86bfb18bad60fc468e5f112cbbd918462a8dd435, dc7e0192c470a53d847c79a2796f9ac429477a26 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 0.17% 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 a9ccf140a2a03a0ae82be4bdfbdd17bdaea72ff5 or 86bfb18bad60fc468e5f112cbbd918462a8dd435 or dc7e0192c470a53d847c79a2796f9ac429477a26 or 0bc380beb78aa352eadbc21d934dd9606fcee808, whichever matches your release line, or a later version.
- Update Linux Kernel to 5.15.121 or 6.1.39 or 6.4.4, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 87e28a15c42cc592009c32a8c20e5789059027c2 up to, but not including, a9ccf140a2a03a0ae82be4bdfbdd17bdaea72ff5; 87e28a15c42cc592009c32a8c20e5789059027c2 up to, but not including, 86bfb18bad60fc468e5f112cbbd918462a8dd435; 87e28a15c42cc592009c32a8c20e5789059027c2 up to, but not including, dc7e0192c470a53d847c79a2796f9ac429477a26; 87e28a15c42cc592009c32a8c20e5789059027c2 up to, but not including, 0bc380beb78aa352eadbc21d934dd9606fcee808; 5.13 | a9ccf140a2a03a0ae82be4bdfbdd17bdaea72ff5, 86bfb18bad60fc468e5f112cbbd918462a8dd435, dc7e0192c470a53d847c79a2796f9ac429477a26, 0bc380beb78aa352eadbc21d934dd9606fcee808 |
| Linux | Linux Kernel | 5.13 up to, but not including, 5.15.121; 5.16 up to, but not including, 6.1.39; 6.2 up to, but not including, 6.4.4 | 5.15.121, 6.1.39, 6.4.4 |
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 NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.3 | High | CNA |
| CVSS 3.1 | 7.8 | High | NVD |
Official description
In the Linux kernel, the following vulnerability has been resolved: KVM: s390/diag: fix racy access of physical cpu number in diag 9c handler We do check for target CPU == -1, but this might change at the time we are going to use it. Hold the physical target CPU in a local variable to avoid out-of-bound accesses to the cpu arrays.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Write
The product writes data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, many languages that perform their own memory management, such as Java and Perl, are not subject to buffer overflows. Other languages, such as Ada and C#, typically provide overflow protection, but the protection can be disabled by the programmer. Be wary that a language's interface to native code may still be subject to overflows, even if the language itself is theoretically safe.
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. Examples include the Safe C String Library (SafeStr) by Messier and Viega, and the Strsafe.h library from Microsoft. These libraries provide safer versions of overflow-prone string-handling functions.
- Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index checking. D3-SFCV (Stack Frame Canary Validation) from D3FEND discusses canary-based detection in detail.
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 Write vulnerabilities
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
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