Linux: Out-of-bounds Read
CVE-2022-49946 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 fcae47b2d23c81603b01f56cf8db63ed64599d34, ff0b144d4b0a9fbd6efe4d2c0a4b6c9bae2138d2, c8b04b731d43366824841ebdca4ac715f95e0ea4 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 fcae47b2d23c81603b01f56cf8db63ed64599d34 or ff0b144d4b0a9fbd6efe4d2c0a4b6c9bae2138d2 or c8b04b731d43366824841ebdca4ac715f95e0ea4 or bc163555603e4ae9c817675ad80d618a4cdbfa2d, whichever matches your release line, or a later version.
- Update Linux Kernel to 5.10.142 or 5.15.66 or 5.19.8, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 93d2725affd65686792f4b57e49ef660f3c8c0f9 up to, but not including, fcae47b2d23c81603b01f56cf8db63ed64599d34; 93d2725affd65686792f4b57e49ef660f3c8c0f9 up to, but not including, ff0b144d4b0a9fbd6efe4d2c0a4b6c9bae2138d2; 93d2725affd65686792f4b57e49ef660f3c8c0f9 up to, but not including, c8b04b731d43366824841ebdca4ac715f95e0ea4; 93d2725affd65686792f4b57e49ef660f3c8c0f9 up to, but not including, bc163555603e4ae9c817675ad80d618a4cdbfa2d; 5.9 | fcae47b2d23c81603b01f56cf8db63ed64599d34, ff0b144d4b0a9fbd6efe4d2c0a4b6c9bae2138d2, c8b04b731d43366824841ebdca4ac715f95e0ea4, bc163555603e4ae9c817675ad80d618a4cdbfa2d |
| Linux | Linux Kernel | 5.9 up to, but not including, 5.10.142; 5.11 up to, but not including, 5.15.66; 5.16 up to, but not including, 5.19.8; 6.0 | 5.10.142, 5.15.66, 5.19.8 |
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: clk: bcm: rpi: Prevent out-of-bounds access The while loop in raspberrypi_discover_clocks() relies on the assumption that the id of the last clock element is zero. Because this data comes from the Videocore firmware and it doesn't guarantuee such a behavior this could lead to out-of-bounds access. So fix this by providing a sentinel element.
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
- 7.5 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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