Linux: Out-of-bounds Read
CVE-2022-50200 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 2dabe6a872a5744865372eb30ea51e8ccd21305a, 477722f31ad73aa779154d1d7e00825538389f76, 90bdf50ae70c5571a277b5601e4f5df210831e0a 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 0.28% 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 2dabe6a872a5744865372eb30ea51e8ccd21305a or 477722f31ad73aa779154d1d7e00825538389f76 or 90bdf50ae70c5571a277b5601e4f5df210831e0a or adbfdaacde18faf6cd4e490764045375266b3fbd, whichever matches your release line, or a later version.
- Update Linux Kernel to 4.14.291 or 4.19.256 or 5.4.211 or 5.10.137, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | cee74f47a6baba0ac457e87687fdcf0abd599f0a up to, but not including, 2dabe6a872a5744865372eb30ea51e8ccd21305a; cee74f47a6baba0ac457e87687fdcf0abd599f0a up to, but not including, 477722f31ad73aa779154d1d7e00825538389f76; cee74f47a6baba0ac457e87687fdcf0abd599f0a up to, but not including, 90bdf50ae70c5571a277b5601e4f5df210831e0a; cee74f47a6baba0ac457e87687fdcf0abd599f0a up to, but not including, adbfdaacde18faf6cd4e490764045375266b3fbd; cee74f47a6baba0ac457e87687fdcf0abd599f0a up to, but not including, 7363a69d8ca8f0086f8e1196c8ddaf0e168614b1; cee74f47a6baba0ac457e87687fdcf0abd599f0a up to, but not including, 9605f50157cae00eb299e1189a6d708c84935ad8; cee74f47a6baba0ac457e87687fdcf0abd599f0a up to, but not including, dedd558d9765b72c66e5a53948e9f5abc3ece1f6; cee74f47a6baba0ac457e87687fdcf0abd599f0a up to, but not including, 15ec76fb29be31df2bccb30fc09875274cba2776; and 1 more ranges | 2dabe6a872a5744865372eb30ea51e8ccd21305a, 477722f31ad73aa779154d1d7e00825538389f76, 90bdf50ae70c5571a277b5601e4f5df210831e0a, adbfdaacde18faf6cd4e490764045375266b3fbd, 7363a69d8ca8f0086f8e1196c8ddaf0e168614b1, 9605f50157cae00eb299e1189a6d708c84935ad8 |
| Linux | Linux Kernel | 2.6.37 up to, but not including, 4.14.291; 4.15 up to, but not including, 4.19.256; 4.20 up to, but not including, 5.4.211; 5.5 up to, but not including, 5.10.137; 5.11 up to, but not including, 5.15.61; 5.16 up to, but not including, 5.18.18; 5.19 up to, but not including, 5.19.2 | 4.14.291, 4.19.256, 5.4.211, 5.10.137, 5.15.61, 5.18.18 |
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: selinux: Add boundary check in put_entry() Just like next_entry(), boundary check is necessary to prevent memory out-of-bound access.
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
- git.kernel.org/stable/c/15ec76fb29be31df2bccb30fc09875274cba2776
- git.kernel.org/stable/c/2dabe6a872a5744865372eb30ea51e8ccd21305a
- git.kernel.org/stable/c/477722f31ad73aa779154d1d7e00825538389f76
- git.kernel.org/stable/c/7363a69d8ca8f0086f8e1196c8ddaf0e168614b1
- git.kernel.org/stable/c/90bdf50ae70c5571a277b5601e4f5df210831e0a
- git.kernel.org/stable/c/9605f50157cae00eb299e1189a6d708c84935ad8
- git.kernel.org/stable/c/adbfdaacde18faf6cd4e490764045375266b3fbd
- git.kernel.org/stable/c/dedd558d9765b72c66e5a53948e9f5abc3ece1f6
Recent Out-of-bounds Read vulnerabilities
- 7.5 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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