Linux: Out-of-bounds Read
CVE-2022-50306 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 6969367c1500c15eddc38fda12f6d15518ad6d03, f234294812c9b68d603650d28743eafb718e7ad5, 1b45cc5c7b920fd8bf72e5a888ec7abeadf41e09 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 0.16% 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 6969367c1500c15eddc38fda12f6d15518ad6d03 or f234294812c9b68d603650d28743eafb718e7ad5 or 1b45cc5c7b920fd8bf72e5a888ec7abeadf41e09, whichever matches your release line, or a later version.
- Update Linux Kernel to 5.15.87 or 6.0.6, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 up to, but not including, 6969367c1500c15eddc38fda12f6d15518ad6d03; 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 up to, but not including, f234294812c9b68d603650d28743eafb718e7ad5; 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 up to, but not including, 1b45cc5c7b920fd8bf72e5a888ec7abeadf41e09; 5.10 | 6969367c1500c15eddc38fda12f6d15518ad6d03, f234294812c9b68d603650d28743eafb718e7ad5, 1b45cc5c7b920fd8bf72e5a888ec7abeadf41e09 |
| Linux | Linux Kernel | before 5.15.87; 5.16 up to, but not including, 6.0.6 | 5.15.87, 6.0.6 |
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 | 7.1 | High | CNA |
| CVSS 3.1 | 7.1 | High | NVD |
Official description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix potential out of bound read in ext4_fc_replay_scan() For scan loop must ensure that at least EXT4_FC_TAG_BASE_LEN space. If remain space less than EXT4_FC_TAG_BASE_LEN which will lead to out of bound read when mounting corrupt file system image. ADD_RANGE/HEAD/TAIL is needed to add extra check when do journal scan, as this three tags will read data during scan, tag length couldn't less than data length which will read.
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.
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
Recent Out-of-bounds Read vulnerabilities
- 7.1 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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